Olivetti BA2067 BA2070 T.1.5, M4-4X/M4-6X/PCS4XX T.1 M4-x0 PCS4xC service manual

M4-4x / M4-6x / PCS4xx

This chapter describe s th e following Perso nal Com put er mod els:

PERSONAL
COMPUTER

M4-40 T. 1 i486SX @ 25 MHz

M4-46 T. 1 i486DX2 @ 50 MHz

M4-60 T. 1 i486SX @ 25 MHz

M4-62 T. 1 i486SX @ 33 MHz

M4-64 T. 1 i486DX @ 33 MHz

M4-65 T. 1 i486DX2 @ 50 MHz

M4-66 T. 1 i486DX2 @ 66 MHz

PCS 44/C T. 1 i486SX @ 25 MHz

PCS 46/C T. 1 i486DX2 @ 50 MHz

MOTHER­BOARD

T. 1.5 i486SX @ 25 MHz

T. 1.5 i486SX @ 33 MHz

T. 1.5 i486DX @ 33 MHz

T. 1.5 i486DX2 @ 50 MHz

T. 1.5 i486DX2 @ 66 MHz

PROCESSOR CLOCK COPROCESSOR /

Soldered

On-socket

Soldered

Soldered

On-socket (*)

On-socket (*)

On-socket (*)

On-socket (*)

On-socket

On-socket (*)

On-socket

On-socket (*)

Soldered

On-socket

CASE

OVERDRIVE

25 MHz i487SX @ 25 MHz

i486DX2 @ 50 MHz

25 MHz NO MicroTower

25 MHz i487SX @ 25 MHz

i486DX2 @ 50 MHz

25 MHz i487SX @ 25 MHz

i486DX2 @ 50 MHz
P24 T

33 MHz i487SX @ 33 MHz

i486DX2 @ 66 MHz

33 MHz i487SX @ 33 MHz

i486DX2 @ 66 MHz
P24 T

33 MHz i486DX2 @ 66 MHz M305 BOX

33 MHz i486DX2 @ 66 MHz

P24 T

25 MHz NO M305 BOX

25 MHz P24 T

33 MHz NO M305 BOX

33 MHz P24 T

25 MHz i487SX @ 25 MHz

i486DX2 @ 50 MHz

25 MHz NO MicroTower

MicroTower

M305 BOX

M305 BOX

MicroTower

2

(*) The coprocess or or Over Drive ca n only be inst alled by replacing th e system ’s or ig inal proc esso r.

MICROTO WER CASE

AYD9A

M4-4x / M4-6x / PCS4xx 2-1

305 BOX CASE

EXE1A

CHARACTERISTICS

Architecture AT
Memory On-board, from 4 MB to 36 MB

Bank 0: 4 MB soldered
Bank 1: for one of the fo llo win g SIMM s:
EXM 28-004 - 4 MB, One 1MB x 36 SIM M
EXM 28-008 - 8 MB, One 2 MB x 36 SIMM
EXM 28-016 - 16 MB, One 4 MB x 36 SIMM
EXM 29-032 - 32 MB, One 8 MB x 36 SIMM

Memory access 70 ns
Video memory 512 KB + 512 KB of DRAM HM514260
Floppy Disks The Mic rotower case c an hos t:

Drive A: 3.5", 1.44 M B disket te dr ive
Drive B: 5.25", 1. 2 MB flop py dr iv e
The 305 BOX case can host:
Drive A: 3.5", 1.44 M B disket te dr ive
Drive B: 5.25"1. 2 MB or 3.5"1. 44 M B

1.2 MB, 5.25" Panasonic JU47 5-3 /4 /5

1.2 MB, 5.25" Toshiba ND 08 D E

1.44 MB, 3.5" Panasonic JU 257 A

1.44 MB, 3.5" Sony M P-F 17 W

1.44 MB, 3.5" Mitsubishi MF 355

1.44 MB, 3.5" EPSON SMD 104 0-4 18

1.44 MB, 3.5" Y-E DATA YD-702B / 702D

1.44 MB, 3.5" MITSUMI D359C / D359T 3

Hard Disks CONNER CP30084E 85 MB

WD. Caviar 2 80 85 MB
Quantum ELS 85 AT 85 MB
CONNER CP30174E / CFA170A 170 MB
Quantum ELS 170 AT 170 MB
W.D. AC1170 170 MB
Quantum LPS170 AT (local BUS) 170 MB
W.D. AC1220 210 MB
CONNER CFS210A-E (local BUS) 210 MB
SEAGATE ST3250 A (local BUS) 210 MB
Quantum LPS210 AT 210 MB
CONNER CP30254 240 MB
QUANTUM LPS240 AT 240 MB
W.D. AC2250-14F 240 MB
CONNER CP3304 / CP3364 340 MB
W.D.AC2340 340 MB
CONNER CFA340A 340 MB
Quantum LPS340 AT (local BUS) 340 MB
SEAGATE ST3391A 340 MB
CONNER CP3544 510 M B
CONNER CP30544 540 MB
SEAGATE ST3655A 540 MB
CONNER CFA540A (local BUS) 540 MB
SEAGATE ST5660 (local BUS) 540 MB

Streaming Tap es Irwin 31250A 80/120 MB flop py int erfac e

Wangte k 5159E S 150 MB SCSI interface
Wangtek 5525 ES - 5525ES-ACA 320 MB

SCSI interface. Require s the ASC-2 bo ard .

Continues ------>

BIOS

BA2032 - BA2034 ­BA2039
Last level: Rev. 2.06

BA2033 - BA2036
Last level:
Rev. 2.06/S

BA2050 - BA2076 ­BA2077 - BA2063 ­BA2078 - BA2064 ­BA2079 - BA2068 ­BA2184- BA2183
BA2187
Last level: Rev. 2.06

EXPANSION BUS
Microtower case:

IN 139

Last level: Nasc.

305 BOX case
IN2003

Last level: 01

IN2016

Last level: Nasc.

POWER SUPPLY
Microtower case

MINEBA NMBSPE 1095
LA/11 BNMB 110 V
LA/16 BNMB 220 V

305 BOX case

PS11 R 220 V - 115 V
PS11 AR 220 V - 115 V

CONSOLE BOA R D

For microtower case
only

IF2010

Level 01

2-2 M4-4x / M4-6x / PCS4xx

Slots Microtowe r case

Two 16-bit con nect ors on t he ex pans ion bus
305 BOX case

Four 16-bit conn ect or s on the exp ansion bus
Video controller Integrated CL- G D542 8 Enhanced VG A
HDU and FDU

controller

Integrated - Flo ppy disk contro ller: 87310

HDU interface: MSI buf fer and logic por ts
Mouse PS/2- and AT-compatible
Keyboard 101/102-key ANK 27-10 1/ N, ANK 27-102 /N

MOTHERBOARD

MOTHERBOARD DESCRIPTION DESTINATION MODE L

BA2034 Base Assembly T.1 (BA2054) - 25 MHz

i486SX CPU - Two serial ports

M4-40; M4-60

Manufactured in Scarmagno.

BA2032 Base Assembly T.1 (BA2054 ) - Without CP U

Two serial ports
Manufacture d in Singapor e.

BA2039 Base Assembly T.1 (BA2054 ) - Without CP U

Two serial ports

M4-46; M4-62; M4- 64; M4-65 ;
M4-66

Manufactured in Scarmagno.

BA2033 Base Assembly T.1 (BA2044) - 25 MHz

i486SX CPU - One serial port and one
game port. Manuf act ur ed in Scar magno. PCS 44/C - PCS 46/C

BA2036 Base Assembly T.1 (BA2044 ) - Without CP U

One serial port and one gam e port
Manufactured in Scarmagno.

BA2050

Base Assembly T.1.5 (BA2067 ) for BA2050
Base Assembly T.1.5 (BA2070 ) for BA2076

BA2076
BA2051

Without CPU - Two ser ial p ort s
Manufactured in Scarmagno.

Base Assembly T.1.5 (BA2067 ) for BA2051

M4-64; M4-65; M4-66

Base Assembly T.1.5 (BA2070 ) for BA2077
Without CPU - Two ser ial p ort s

BA2077
BA2063

Manufacture d in Singapor e.
Base Assembly T.1.5 (BA2067 ) for BA2063

Base Assembly T.1.5 (BA2070 ) for BA2078

BA2078
BA2064

25 MHz i486SX CPU - Two serial ports
Manufactured in Scarmagno.

Base Assembly T.1.5 (BA2067 ) for BA2064

M4-60

Base Assembly T.1.5 (BA2070 ) for BA2079
25 MHz i486SX CPU - Two serial ports

BA2079

Manufacture d in Singapor e.

BA2068 Base Assembly T.1.5 (BA2067 )

33 MHz i486SX CPU - Two serial ports

M4-62

Manufactured in Scarmagno.

BA2183

BA2183 Base Assembly T. 1 (BA2054) S ingapo re
BA2184 Base Assembly T. 1. 5 (BA 20 70) Scarmag no - Boards manufactured

BA2184

excl usi v el y f or O l i service - NO CPU - With modif icat ions f or KINGSTO N L AN

BA2083 Will not be documented as since it is only present on the Singapore market.

2

M4-4x / M4-6x / PCS4xx 2-3

MOTHERBOARD EVOLUTION

LEVEL D.R.S.

Nasc.

BA2032

Lev. 01

Lev. 02

Lev. 03

Lev. 04

ROM BIO S NOTES

CODE

588091 P Lev. 1.03

Lev. 1.05

Lev. 1.05

Lev. 1.05

Lev. 1.07 PD3L

Motherboard for the following PCs:
M4-46; M4-62; M4-64; M4-65; M4-66
Features - Type T. 1 (BA2054)

- No CPU (Depending on the
PC model)

- Two serial ports

New BIOS (see t he spe cific table)
Modifications to the pr int ed circ uit an d addition of
new components to render the board compatible
with EMI standards.

Renewed print ed cir cuit , thus causing the name of
the Base Assembly to change from T. 1 (BA2054)
to T 1.5 (BA2067).
As a result the names of the bo ard s also change.

Addition of four 47 pF capacit or s between pin s 3, 6,
8 and 11 of the com po nent at lo cat ion U71 an d
ground, to solve the PARITY ERRO RS cause d by
the incorrect timing of the CAS gene ration
circuit.

New BIOS (see t he spe cific table)

Lev. 05

Lev. 2.0

New BIOS (see t he spe cific table)
Cuts and wirings made, with the addit ion of jump er
J45 to disable the video cont r ol ler. All this solves
the prob le m with the OS/2 operatin g syst em re l 1.3
Ver. 2.02 u pd. 6

Lev. 06

Lev. 2.0

New printed cir cuit (C.S. 01) to embody the Parity
Error modific atio ns (see Lev. 03).
WARNING: Does not rec uper ate t he wirings of the
previous level (OS/2 pr oblem ).

Due to production purposes, not al l the board s ma nuf act ur ed ha ve the new BI O S 2. 0 and
the cuts and wirings to solve the pr oblem s with OS/2 (see Le v. 05).
From here on all boar d levels will be dealt with diffe ren tly, dep ending on whether th ey
incorportat e the modif ications to solve OS/2 problem s or not .

BA2032 * Indicat es t he boa rd on which th e modifica tion was car ried ou t.
BA2032 ** Indicat es the board on which the modif icat ion was no t carr ied out .

588091 P

* = Motherboa rd with modifica tion for OS/2 Ver 1.13

In other words: BIOS 2.0, cuts and wirin gs

Lev. 07

BA2032 *

Lev. 2.0

Fictitious level in order to correct ly docu ment
(without skipping levels) the BI O S used on the M4 ­XX and PCS models.
BIOS 2.0/S is used on the PCS mode ls.

2-4 M4-4x / M4-6x / PCS4xx

LEVEL D.R.S.

CODE

588091 P

ROM BIOS NOTES

* = Motherboar d with chang es for OS/ 2 Ver 1.1 3

In other words: BIO S 2. 0, cut s and wirings

Lev. 08

BA2032 *

Lev. 09

Lev. 10

Lev. 11

Lev. 2.0

Lev. 2.03 PD2C

Lev. 2.03

Lev. 2.04 PD2R

Lev. 2.04

New printed circuit ( C.S. 02) which incorpor at es t he
wirings and has a 68 pF capacitor in location C412

New BIOS (see the spec ific table) .
New 74LS245 and GD752 32 compo nent s that
replace the 74ALS245 and SN75C185,
respectively.

Replaced resist or s and ca pacit or s to solve the
following video problems:

- Comet effect visible at a resolution of
1024x768 with a 72 Hz vertical sync.

- Incorrect compensation between the modulation
of a line and the modulation of a dot (the
horizontal l ine is bright er than t he ver tic al one) .

Intel has modified t he CPU id ent ifier by using the
one for the SL Enhanced family, not recognized by
the previous BIOS 2.03.
This BIOS level only recog nizes the SL E nh ance d
CPU.

Introduct ion of the SL Enha nced 33 MHz i486SX
CPU, only used by the M4-6 2 Personal Com puter.
Since this is an alternative CPU, boar d level does
not change.

2

Lev. 12

Lev. 13

Lev. 14

Lev. 15
MI

Lev. 15 SI

Lev. 2.06 PDK0

Lev. 2.06

Lev. 2.06

Lev. 2.06

- New BIOS (see specific ta ble)

- Increase in CMOS VBATT marg in s durin g
stand by.

Cuts, wirings and the add ition of a resist or to
correct syst em failures wh en COGENT / WANG
boards are used.

1000 pF capacitor insta lled at location CA1 to
eliminate the noise on IRQ1 4 which caus es the
system to malf unct ion wit h cer ta in types of
Quantum hard disk drives (170 MB and 340 MB).

Replaced the 1 O hm re sist ors at location s R148
and R149 with 0 Ohm resistor s. This cor re cts th e
screen’s backgro und inst ab ilit y in Windows and
OS/2 when accessing HDUs and FDUs.

The modification mad e at boar d level 13
(COGENT / WANG boar ds) is remove d. To solve
this problem, a new motherboard BA2187 i s

develop e d excl us iv el y for Oli se rvi ce .

M4-4x / M4-6x / PCS4xx 2-5

LEVEL D.R.S.

CODE

588091 P

ROM BIO S NOTES

** = Motherboard does not incorpor at e the

modifications f or OS/2.

Lev. 05
(See

BA2032 **

BA2032)
Lev. 06

Lev. 07/A

Lev. 08/A

Lev. 09/A

Lev. 10/A

Lev. 1.07 PD3L

Lev. 1.07

Lev. 1.07

Lev. 1.10 PD2A

Lev. 1.10

Lev. 1.10

Fictitious level since BIOS 2. 0 is not used.
However, the printed curcuit has been modified,
whose level cahnge s to 01.

Ficticious le vel in orde r to cor rec tly do cum ent
(without skipping levels) the BI O S used on the
M4-XX and PCS models.
BIOS 2.0/S is used on the PCS mode ls.

New printed cir cuit (C.S. 02 ) which incorpo rates the
wirings and has a 68 pF capacitor in location C412

New BIOS (see t he spe cific table) .
New 74LS245 and GD7 5 232 co mponen ts that
replace the 74ALS245 and SN75C185 ,
respectively.

Replaced resistor s and capacitor s to cor rec t the
following video problems:

- Comet effect visible at a reso lu tion of
1024x768 with a 72 Hz vertica l sync.

- Incorrect com pen sation between the mo dulat ion
of a line and the modula tion of a dot (the
horizontal line is brighte r than the ve rtical line ).

Cuts, wirings and the ad dition of a resistor to
correct syste m failures when CO GENT / WANG
boards are used .

Lev. 11/A

Lev. 1.13 PDK9

- New BIOS (see spec ific table)

- Increase in CMOS VBATT mar gins dur in g
stand by.

Lev. 12/A

Lev. 1.13

1000 pF capac itor in sta lled at locatio n CA1 to
eliminate the noise on IRQ14 which causes the
system to malfunc tion with cer t ain types of
Quantum hard dis k drives (17 0 MB and 340 MB).

Lev. 13/A

Lev. 1.13

Replaced the 1 Ohm resistor s at locatio ns R148
and R149 with 0 Ohm resisto rs. This co rrect s the
screen’s bac kgr ound instab ility in Wind ows and
OS/2 when accessing HDUs an d FDUs.

2-6 M4-4x / M4-6x / PCS4xx

LEVEL D.R.S.

Nasc.

BA2034

Lev. 01

ROM BIOS NOTES

CODE

588092 Q Lev. 1.03

Lev. 1.05

Motherboard for the following PC models:
M4-40; M4-60
Features - Type T. 1 (BA2054)

- 25 MHz i486SX CPU

- Two serial ports

New BIOS (see the spec ific table)
Modifications t o the pr inte d circu it and addit io n of
new components to render the board compatible
with EMI stan dards.

2

Lev. 02

Lev. 1.05

Renewed print ed circ uit, thus ca using t he na me of
the Base Assembly to cha nge f rom T. 1 (BA2 054)
to T 1.5 (BA2067).
As a result the names of the boa rds als o change.

Lev. 03

Lev. 1.05

Addition of four 47 pF capacit ors between pins 3, 6,
8 and 11 of the compon ent at locat ion U71 and
ground, to solve the PARITY ERRORS ca used by
the incorrect timing of th e CAS generat ion
circuit.

Lev. 04

Lev. 1.05

Keyboard controller r el. 10 .0 1 has be en re placed

with rel. 10. 02
Lev. 05
Lev. 06

Lev. 1.07 PD3L
Lev. 2.0

New BIOS (see the spec ific table) .

New BIOS (see the spec ific table)

Cuts and wirings made , with the additio n of jumpe r

J45 to disable the video contro ller. All this correct s

the problem with the OS/2 op era ting system rel 1.3

Ver. 2.02 upd. 6
Lev. 07

Lev. 2.0

New printed circuit ( C.S. 01) which incorpor at es t he

Parity Error modif icat ions (s ee Lev . 03).

WARNING: Does not recuper at e the w irings of the

previous level (OS/2 pr oblem ).
Due to productio n pur pose s, not all the boards man uf actur ed hav e the new BI O S 2.0 and

the cuts and wirings to solv e the pro blem s with OS/ 2 (see Lev . 06).
From here on all boar d levels w ill be de alt wit h differ ent ly, depe nding on whet her they
incorportate t he modif ic atio ns to solve O S/ 2 problem s or not .

BA2034 * Indicates the board on which the mod ificat ion was carried out .
BA2034 ** Indicates the bo ard on which the m odif icat io n was not car ried out.

588092 Q

* = Motherboar d with modificat ion f or OS/2 Ver 1. 13

In other words: BIO S 2. 0, cut s and wirings

Lev. 08

BA2034 *

Lev. 2.0

Ficticious level in order to correctly document

(without skipping leve ls) the BIO S used on the M4-

XX and PCS models.

BIOS 2.0/S is used on t he PCS m odels.

M4-4x / M4-6x / PCS4xx 2-7

LEVEL D.R.S.

CODE

588092 Q

ROM BIO S NOTES

* = Motherboa rd with chan ges f or OS/2 Ver 1.1 3

In other words: BIOS 2.0, cuts and wirin gs

Lev. 09

BA2034 *

Lev. 1.10

Lev. 11

Lev. 12

Lev. 13

Lev. 2.0

Lev. 2.03 PD2C

Lev. 2.03

Lev. 2.04 PD2R

Lev. 2.06 PDK0

New printed cir cuit (C.S. 02 ) which incorpo rates the
wirings and has a 68 pF capacitor in locat ion C412.

New BIOS (see t he spe cific table) .
New 74LS245 and GD7 5 232 co mponen ts that
replace the 74ALS245 and SN75C185 ,
respectively.

Replaced resistor s and capacitor s to cor rec t the
following video problems:

- Comet effect visible at a reso lu tion of
1024x768 with a 72 Hz vertica l sync.

- Incorrect com pen sation between the mo dulat ion
of a line and the modula tion of a dot (the
horizontal line is brighte r than the ve rtical one) .

Intel has modified the CPU ident if ie r by using the
one for the SL Enhance d fa mily, not rec ognize d by
the previous BIOS 2.03.
This BIOS level does not allow the use of the SL
Enhanced CPU.

- New BIOS (see spec ific table)

- Increase in CMOS VBATT mar gins dur in g
stand by.

- Use of the SL Enhanced 25 MHz i486SX C P U

Lev. 14

Lev. 15

Lev. 16
MI

Lev. 16 SI

Lev. 2.06

Lev. 2.06

Lev. 2.06

Cuts, wirings and the ad dition of a resistor to
correct syste m failures when CO GENT / WANG
boards are used .

1000 pF capac itor in sta lled at locatio n CA1 to
eliminate the noise on IRQ14 which causes the
system to malfunc tion with cer t ain types of
Quantum hard dis k drives (17 0 MB and 340 MB).

Replaced the 1 Ohm resistor s at locatio ns R148
and R149 with 0 Ohm resisto rs. This co rrect s the
screen’s bac kgr ound instab ility in Wind ows and
OS/2 when accessing HDUs an d FDUs.

The modific at ion ma de at boar d level 13
(COGENT / WANG boa rds ) is removed. To corre ct
this problem, a new motherb oard BA2187 is

develop ed exc lu si vel y fo r Olis erv ice.

2-8 M4-4x / M4-6x / PCS4xx

LEVEL D.R.S.

CODE

588092 Q

ROM BIOS NOTES

** = Motherboard does not incor por ate th e

modificat ions f or OS/ 2.

Lev. 06
(See

BA2034 **

BA2034)
Lev. 07

Lev. 08/A

Lev. 09/A

Lev. 10/A

Lev. 11/A

Lev. 1.07 PD3L

Lev. 1.07

Lev. 1.07

Lev. 1.10 PD2A

Lev. 1.10

Lev. 1.10

Fictitious level since BIOS 2.0 is not used.
However, the printed curcuit has be en m odif ie d,
whose level cahnges to 01.

Ficticious level in order to correctly document
(without skipping leve ls) the BIO S used on the
M4-XX and PCS models.
BIOS 2.0/S is used on t he PCS m odels.

New printed circuit ( C.S. 02) which incorpor at es t he
wirings and has a 68 pF capacitor in location C412

New BIOS (see the spec ific table) .
New 74LS245 and GD752 32 compo nent s that
replace the 74ALS245 and SN75C185,
respectively.

Replaced resist or s and ca pacit or s to correct the
following video problems:

- Comet effect visible at a resolution of
1024x768 with a 72 Hz vertical sync.

- Incorrect compensation between the modulation
of a line and the modulation of a dot (the
horizontal lin e is brighter than t he ver t ical line).

Cuts, wirings and the add ition of a resist or to
correct syst em failures wh en COGENT / WANG
boards are used.

2

Lev. 12/A

Lev. 1.13 PDK9

- New BIOS (see specific ta ble)

- Increase in CMOS VBATT marg in s durin g
stand by.

- Use of an Sl Enhanced 25 MHz i486SX CPU.

Lev.
13MD/A

Lev. 1.13

1000 pF capacitor insta lled at location CA1 to
eliminate the noise on IRQ1 4 which caus es the
system to malf unct ion wit h cer ta in types of
Quantum hard disk drives (170 MB and 340 MB).

12MI/A

Lev. 1.13

Replaced the 1 O hm re sist ors at location s R148
and R149 with 0 Ohm resistor s. This cor re cts th e
screen’s backgro und inst ab ilit y in Windows and
OS/2 when accessing HDUs and FDUs.

M4-4x / M4-6x / PCS4xx 2-9

LEVEL D.R.S.

Nasc.

BA2039

ROM BIO S NOTES

CODE

588091 P Lev. 1.03

Motherboard for the following Personal Com puter
models: M4-46; M4-62; M4-64; M4-65; M4-66
Features: - Type T. 1 (BA2054)

- No CPU (depending on the

Personal Compu te r m odel)

- Two serial ports

Lev. 01

Lev. 02

Lev. 03

Lev. 04

Lev. 05
Lev. 06

Lev. 1.05

Lev. 1.05

Lev. 1.05

Lev. 1.05

Lev. 1.07 PD3L
Lev. 2.0

New BIOS (see t he spe cific table)
Modifications to the pr int ed circ uit an d addition of
new components to render the board compatible
with EMI standards.

Renewed print ed cir cuit , thus causing the name of
the Base Assembly to change from T. 1 (BA2054)
to T 1.5 (BA2067).
As a result the names of the bo ard s also change.

Addition of four 47 pF capacit or s between pin s 3, 6,
8 and 11 of the com po nent at lo cat ion U71 an d
ground, to solve the PARITY ERRO RS cause d by
the incorrect timing of the CAS gene ration
circuit.

Keyboard cont roller rel. 10. 01 has been replace d
by rel. 10.0 2

New BIOS (see t he spe cific table) .
New BIOS (see t he spe cific table)

Cuts and wirings made, with the addit ion of jump er
J45 to disable the video cont r ol ler. All this cor rec ts
the prob le m with the OS/2 operatin g syst em re l 1.3
Ver. 2.02 upd. 6.

Lev. 07

Lev. 2.0

New printed cir cuit (C.S. 01 ) which incorpo rates the
Parity Err or modif icat ions ( see Le v. 03).
WARNING: Does not rec uper ate t he wirings of the
previous level (OS/2 pr oblem ).

Due to production purposes, not al l the board s ma nuf act ur ed ha ve the new BI O S 2. 0 and
the cuts and wirings to solve the pr oblem s with OS/2 (see Le v. 06).
From here on all boar d levels will be dealt with diffe ren tly, dep ending on whether th ey
incorportat e the modif ications to solve OS/2 problem s or not .

BA2039 * Indicat es t he boa rd on which th e modifica tion was car ried ou t.
BA2039 ** Indicat es the board on which the modif icat ion was no t carr ied out .

588091 P

* = Motherboa rd with modifica tion for OS/2 Ver 1.13

In other words: BIOS 2.0, cuts and wirin gs

Lev. 08

BA2039 *

Lev. 2.0

Ficticious le vel in orde r to cor rec tly do cum ent
(without skipping levels) the BI O S used on the
M4-XX and PCS models.
BIOS 2.0/S is used on the PCS mode ls.

2-10 M4-4x / M4-6x / PCS4xx

LEVEL D.R.S.

CODE

588091 P

ROM BIOS NOTES

* = Motherboar d with chang es for OS/ 2 Ver 1.1 3

In other words: BIO S 2. 0, cut s and wirings

Lev. 09

BA2039 *

Lev. 10

Lev. 11

Lev. 12

Lev. 2.0

Lev. 2.03 PD2C

Lev. 2.03

Lev. 2.04 PD2R

Lev. 2.04

New printed circuit ( C.S. 02) which incorpor at es t he
wirings and has a 68 pF capacitor in location C412

New BIOS (see the spec ific table) .
New 74LS245 and GD752 32 compo nent s that
replace the 74ALS245 and SN75C185,
respectively.

Replaced resist or s and ca pacit or s to correct the
following video problems:

- Comet effect visible at a resolution of
1024x768 with a 72 Hz vertical sync.

- Incorrect compensation between the modulation
of a line and the modulation of a dot (the
horizontal lin e is brighter than t he ver t ical line).

Intel has modified t he CPU id ent ifier by using the
one for the SL Enhanced family, not recognized by
the previous BIOS 2.03.
This BIOS level only recog nizes the SL E nh ance d
CPU.

Introduct ion of the SL Enha nced 33 MHz i486SX
CPU, only used by the M4-6 2 Personal Com puter.
Since this is an alternative CPU, boar d level does
not change.

2

Lev. 13

Lev. 14

Lev. 15

Lev. 16
MI

Lev. 16 SI

Lev. 2.06 PDK0

Lev. 2.06

Lev. 2.06

Lev. 2.06

- New BIOS (see specific ta ble)

- Increase in CMOS VBATT marg in s durin g
stand by.

Cuts, wirings and the add ition of a resist or to
correct syst em failures wh en COGENT / WANG
boards are used.

1000 pF capacitor insta lled at location CA1 to
eliminate the noise on IRQ1 4 which caus es the
system to malf unct ion wit h cer ta in types of
Quantum hard disk drives (170 MB and 340 MB).

Replaced the 1 O hm re sist ors at location s R148
and R149 with 0 Ohm resistor s. This cor re cts th e
screen’s backgro und inst ab ilit y in Windows and
OS/2 when accessing HDUs and FDUs.

The modification mad e at boar d level 13
(COGENT / WANG boards) is remove d. To cor rec t
this problem, a new motherboard BA2187 i s

develop e d excl us iv el y for Oli se rvi ce .

M4-4x / M4-6x / PCS4xx 2-11

LEVEL D.R.S.

CODE

588091 P

ROM BIO S NOTES

** = Motherboard does not incorpor at e the

modifications f or OS/2.

Lev. 06
(See

BA2039 **

BA2039)
Lev. 07

Lev. 08/A

Lev. 09/A

Lev. 10/A

Lev. 11/A

Lev. 1.07 PD3L

Lev. 1.07

Lev. 1.07

Lev. 1.10 PD2A

Lev. 1.10

Lev. 1.10

Fictitious level since BIOS 2. 0 is not used.
However, the printed curcuit has been modified,
whose level change s to 01.

Ficticious le vel in orde r to cor rec tly do cum ent
(without skipping levels) the BI O S used on the
M4-XX and PCS models.
BIOS 2.0/S is used on the PCS mode ls.

New printed cir cuit (C.S. 02 ) which incorpo rates the
wirings and has a 68 pF capacitor in locat ion C412.

New BIOS (see t he spe cific table) .
New 74LS245 and GD7 5 232 co mponen ts that
replace the 74ALS245 and SN75C185 ,
respectively.

Replaced resistor s and capacitor s to cor rec t the
following video problems:

- Comet effect visible at a reso lu tion of
1024x768 with a 72 Hz vertica l sync.

- Incorrect com pen sation between the mo dulat ion
of a line and the modula tion of a dot (the
horizontal line is brighte r than the ve rtical line ).

Cuts, wirings and the ad dition of a resistor to
correct syste m failures when CO GENT / WANG
boards are used .

Lev. 12/A

Lev. 1.13 PDK9

- New BIOS (see spec ific table)

- Increase in CMOS VBATT mar gins dur in g
stand by.

Lev. Lev.
13MD/A

Lev. 1.13

1000 pF capac itor in sta lled at locatio n CA1 to
eliminate the noise on IRQ14 which causes the
system to malfunc tion with cer t ain types of
Quantum hard dis k drives (17 0 MB and 340 MB).

Lev. 12
MI/A

Lev. 1.13

Replaced the 1 Ohm resistor s at locatio ns R148
and R149 with 0 Ohm resisto rs. This co rrect s the
screen’s bac kgr ound instab ility in Wind ows and
OS/2 when accessing HDUs an d FDUs.

2-12 M4-4x / M4-6x / PCS4xx

LEVEL D.R.S.

Nasc.

BA2033

Lev. 01

ROM BIOS NOTES

CODE

588055 S Lev. 1.03

Lev. 1.05

Motherboa rd for the PCS 44/C Per son al Comp uter.
Features - Type T. 1 (BA2044)

- 25 MHz i486SX CPU

- One serial porti

- One game po rti

New BIOS (see the spec ific table)
Modifications t o the pr inte d circu it and addit io n of
new components to render the board compatible
with EMI stan dards.

2

Lev. 02

Lev. 1.05

Renewed print ed circ uit, thus ca using t he na me of
the Base Assembly to cha nge f rom T. 1 (BA2 044)
to T 1.5 (BA2067).
As a result the names of the boa rds als o change.

Lev. 03

Lev. 1.05

Addition of four 47 pF capacit ors between pins 3, 6,
8 and 11 of the compon ent at locat ion U71 and
ground, to correct the PARITY ERRORS ca used by
the incorrect timing of th e CAS generat ion
circuit.

Lev. 04

Inexistent level to align the do cum ent at ion of the

boards used on the PCS systems.
Lev. 05
Lev. 06

Lev. 1.07 PD3L
Lev. 2.0

New BIOS (see the spec ific table) .

New BIOS (see the spec ific table)

Cuts and wirings made , with the additio n of jumpe r

J45 to disable the video contro ller. All this correct s

the problem with the OS/2 op era ting system rel 1.3

Ver. 2.02 upd. 6
Due to productio n pur pose s, not all the boards man uf actur ed hav e the new BI O S 2.0 and

the cuts and wirings to solv e the pro blem s with OS/ 2 (see Lev . 06).
From here on all boar d levels w ill be de alt wit h differ ent ly, depe nding on whet her they
incorportate t he modif ic atio ns to solve O S/ 2 problem s or not .

BA2033 * Indicates the board on which the level 0 6 modifica tion was carried ou t
BA2033 ** Indicates the board on which the level 06 m odif icat ion was no t carrie d out

588055 S

* = Motherboar d with modificat ion f or OS/2 Ver 1. 13

In other words: BIO S 2. 0, cut s and wirings

Lev. 07

BA2033 *

Lev. 2.0

New printed circuit ( C.S. 01) which incorpor at es t he

Parity Error modif icat ions (s ee Lev . 03).

WARNING: Does not recuper at e the w irings of the

previous level (OS/2 pr oblem ).

M4-4x / M4-6x / PCS4xx 2-13

LEVEL D.R.S.

CODE

588055 S

ROM BIO S NOTES

* = Motherboa rd with chan ges f or OS/2 Ver 1.1 3

In other words: BIOS 2.0, cuts and wirin gs.

Lev. 08

BA2033 *

Lev. 09

Lev. 10

Lev. 11

Lev. 12

Lev. 2.0/S

Lev. 2.0/S

Lev. 2.03/S

Lev. 2.03/S

Lev. 2.04/S
PD2S

New BIOS (see t he spe cific table) fo r the gam e
port. This BIO S is only pres ent on PCS models. For
alignme nt of the dif fere nt levels, a fictitiou s level
upgrade fro m 07 to 08 was made f or the
BA2034/39 of M4-XX systems. For the BA2032,
the fictitious le vel upgr ade was made f rom 06 to 07
to correctly docu me nt (without skipping levels) the
distribution of the BIOS am on g th e PCS and M4­XX models).

New printed cir cuit (C.S. 02 ) which incorpo rates the
wirings and has a 68 pF capacitor in locat ion C412.

New BIOS (see t he spe cific table) .
New 74LS245 and GD7 5 232 co mponen ts that
replace the 74ALS245 and SN75C185 ,
respectively.

Replaced resistor s and capacitor s to cor rec t the
following video problems:

- Comet effect visible at a reso lu tion of
1024x768 with a 72 Hz vertica l sync.

- Incorrect com pen sation between the mo dulat ion
of a line and the modula tion of a dot (the
horizontal line is brighte r than the ve rtical one) .

Intel has modified the CPU ident if ie r by using the
one for the SL Enhance d fa mily, not rec ognize d by
the previous BIOS 2.03.
This BIOS level does not allow the use of the SL
Enhanced CPU.

Lev. 13

Lev. 2.06/S
PDK1

- New BIOS (see spec ific table)

- Increase in CMOS VBATT mar gins dur in g
stand by.

- Use of the SL Enhanced 25 MHz i486SX C P U

Lev. 14

Lev. 2.06/S

Cuts, wirings and the ad dition of a resistor to
correct syste m failures when CO GENT / WANG
boards are used .

Lev. 15

Lev. 2.06/S

1000 pF capac itor in sta lled at locatio n CA1 to
eliminate the noise on IRQ14 which causes syst em
failures with certain types of Quant um hard disk
drives (170 MB and 340 MB).

2-14 M4-4x / M4-6x / PCS4xx

LEVEL D.R.S.

Lev. 16
MI

BA2033 *

Lev. 16 SI

ROM BIOS NOTES

CODE

588055 S Lev. 2.06/ S Replaced the 1 Ohm re sist ors at location s R148

and R149 with 0 Ohm resistor s. This cor re cts th e
screen’s backgro und inst ab ilit y in Windows and
OS/2 when accessing HDUs and FDUs.

The modification mad e at boar d level 13
(COGENT / WANG boards) is remove d. To cor rec t
this problem, a new motherboard BA2187 i s

develop e d excl us iv el y for Oli se rvi ce .

2

M4-4x / M4-6x / PCS4xx 2-15

LEVEL D.R.S.

CODE

588055 S

ROM BIO S NOTES

** = Motherboard does not incorpor at e the

modifications f or OS/2.

Lev. 06
(See

BA2033 **

BA2033)

Lev. 07

Lev. 08/A

Lev. 09/A

Lev. 10/A

Lev. 1.07

Lev. 1.07/S
PD3Y

Lev. 1.07/S

Lev. 1.10/S
PD2B

Lev. 1.10/S

Fictitious level as BIOS 2. 0 is not used . The
update to the pr in ted circu it has been made to
incorpora te Parit y Err or modif icat ions ( see Le v.

03). The printed cir cuit remains at level 01.

WARNING: Doe s not incorporate th e wirings of the
previous level (prob le m with OS/2 ).

New BIOS (see t he spe cific table) fo r the gam e
port. This BIO S is only pres ent on PCS models. For
alignme nt of the dif fere nt levels, a fictitiou s level
upgrade fro m 07 to 08 was made f or the
BA2034/39 of M4-XX systems. For the BA2032,
the fictitious le vel upgr ade was made f rom 06 to 07
to correctly docu me nt (without skipping levels) the
distribution of the BIOS am on g th e PCS and M4­XX models).

New printed cir cuit (C.S. 02 ) which incorpo rates the
wirings and has a 68 pF capacitor at locat ion C412.

New BIOS (see t he spe cific table) .
New 74LS245 and GD7 5 232 co mponen ts that
replace the 74ALS245 and SN75C185 ,
respectively.

Replaced resistor s and capacitor s to cor rec t the
following video problems:

- Comet effect visible at a reso lu tion of
1024x768 with a 72 Hz vertica l sync.

- Incorrect com pen sation between the mo dulat ion
of a line and the modula tion of a dot (the
horizontal line is brighte r than the ve rtical one) .

Lev. 11/A

Lev. 1.10/S

Cuts, wirings and the ad dition of a resistor to
correct syste m failures when CO GENT / WANG
boards are used .

Lev. 12/A

Lev. 1.13/S
PDKA

- New BIOS (see spec ific table)

- Increase in CMOS VBATT mar gins dur in g
stand by.

- Use of the SL Enhanced 25 MHz i486SX C P U

Lev. 13
MD/A

Lev. 1.13

1000 pF capac itor in sta lled at locatio n CA1 to
eliminate the noise on IRQ14 which causes syst em
failures with certain types of Quant um hard disk
drives (170 MB and 340 MB).

2-16 M4-4x / M4-6x / PCS4xx

LEVEL D.R.S.

Lev.
12MI/A

BA2033 **

ROM BIOS NOTES

CODE

588055 S Lev. 1.13 Replaced the 1 O hm re sist ors at location s R148

and R149 with 0 Ohm resistor s. This cor re cts th e
screen’s backgro und inst ab ilit y in Windows and
OS/2 when accessing HDUs and FDUs.

2

M4-4x / M4-6x / PCS4xx 2-17

LEVEL D.R.S.

Nasc.

BA2036

ROM BIO S NOTES

CODE

588056 T Lev. 1.03

Motherbo ard used on the PCS 44/C Person al
Comp ut ers
Features - Type T. 1 (BA2044)

- No CPU (uses the i486 DX2)

- One serial port

- One game port

Lev. 01

Lev. 1.05

New BIOS (see t he spe cific table)
Modifications to the pr int ed circ uit an d addition of
new components to render the board compatible
with EMI standards.

Lev. 02

Lev. 1.05

Renewed print ed cir cuit , thus causing the name of
the Base Assembly to change from T. 1 (BA2054)
to T 1.5 (BA2067).
As a result the names of the bo ard s also change.

Lev. 03

Lev. 1.05

Addition of four 47 pF capacit or s between pin s 3, 6,
8 and 11 of the com po nent at lo cat ion U71 an d
ground, to solve the PARITY ERRO RS cause d by
the incorrect timing of the CAS gene ration
circuit.

Lev. 04

Lev. 1.05

Keyboard cont roller rel. 10. 01 has been replace d

by rel. 10.0 2
Lev. 05
Lev. 06

Lev. 1.07 PD3L
Lev. 2.0

New BIOS (see t he spe cific table) .

New BIOS (see t he spe cific table)

Cuts and wirings made, with the addit ion of jump er

J45 to disable the video cont r ol ler. All this cor rec ts

the prob le m with the OS/2 operatin g syst em re l 1.3

Ver. 2.02 upd. 6.
Due to production purposes, not al l the board s ma nuf act ur ed ha ve the new BI O S 2. 0 and

the cuts and wirings to solve the pr oblem s with OS/2 (see Le v. 05).
From here on all boar d levels will be dealt with diffe ren tly, dep ending on whether th ey
incorportat e the modif ications to solve OS/2 problem s or not .

BA2036 * Indicat es t he boa rd on which th e level 06 m odif icat ion was car ried out .
BA2036 ** Indicat es the board on which the leve l 06 modificat ion was not carried out .

2-18 M4-4x / M4-6x / PCS4xx

LEVEL D.R.S.

Lev. 07

BA2036 *

CODE

588056 T

ROM BIOS NOTES

* = Motherboar d with chang es for OS/ 2 Ver 1.1 3

In other words: BIO S 2. 0, cut s and wirings.

Lev. 2.0

New printed circuit ( C.S. 01) that incorp ora tes th e
Parity Error modif icat ions (s ee Lev . 03).
WARNING: Does not incorporate the wirings of the
previous level (problem with OS/2).

2

Lev. 08

Lev. 09

Lev. 10

Lev. 11

Lev. 12

Lev. 2.0/S

Lev. 2.0/S

Lev. 2.03/S

Lev. 2.03/S

Lev. 2.04/S
PD2S

New BIOS (see the spec ific table) for th e game
port. This BIOS is only pr ese nt on PCS mod els.
For alignment of th e different levels, a fictitious
level upgrade from 07 to 08 was made for the
BA2034/39 of M4-XX system s. For the BA2032,
the fictitious level upgr ade was made from 06 to 07
to correctly docum en t (witho ut skipping leve ls) the
distributio n of the BIOS am ong the PCS and
M4-XX models).

New printed circuit ( C.S. 02) which incorpor at es t he
wirings and has a 68 pF capacitor in location C412.

New BIOS (see the spec ific table) .
New 74LS245 and GD752 32 compo nent s that
replace the 74ALS245 and SN75C185,
respectively.

Replaced resist or s and ca pacit or s to correct the
following video problems:

- Comet effect visible at a resolution of
1024x768 with a 72 Hz vertical sync.

- Incorrect compensation between the modulation
of a line and the modulation of a dot (the
horizontal l ine is bright er than t he ver tic al one) .

Intel has modified t he CPU id ent ifier by using the
one for the SL Enhanced family, not recognized by
the previous BIOS 2.03.
This BIOS level does not allow the use of the
SL Enhanced CPU.

Lev. 13

Lev. 2.06/S
PDK1

- New BIOS (see specific ta ble)

- Increase in CMOS VBATT marg in s durin g
stand by.

Lev. 14

Lev. 2.06/S

Cuts, wirings and the add ition of a resist or to
correct syst em failures wh en COGENT / WANG
boards are used.

Lev. 15

Lev. 2.06/S

1000 pF capacitor insta lled at location CA1 to
eliminate the noise on IRQ1 4 which caus es syste m
failures with certain types of Quantum hard disk
drives (170 MB and 34 0 MB) .

M4-4x / M4-6x / PCS4xx 2-19

LEVEL D.R.S.

Lev. 16
MI

BA2036 *

Lev. 16 SI

ROM BIO S NOTES

CODE

588056 T Lev. 2.06/S Replaced the 1 Ohm resistors at locations R148

and R149 with 0 Ohm resisto rs. This co rrect s the
screen’s bac kgr ound instab ility in Wind ows and
OS/2 when accessing HDUs an d FDUs.

The modific at ion ma de at boar d level 13
(COGENT / WANG boa rds ) is removed. To corre ct
this problem, a new motherb oard BA2187 is

develop ed exc lu si vel y fo r Olis erv ice.

2-20 M4-4x / M4-6x / PCS4xx

LEVEL D.R.S.

CODE

588056 T

ROM BIOS NOTES

** = Motherboard does not incor por ate th e

modificat ions f or OS/ 2.

Lev. 06
(See

BA2036 **

BA2036)

Lev. 07

Lev. 08/A

Lev. 09/A

Lev. 10/A

Lev. 1.07

Lev. 1.07/S
PD3Y

Lev. 1.07/S

Lev. 1.10/S
PD2B

Lev. 1.10/S

Fictitious level as BI O S 2.0 is not used. The
update to th e print ed circuit has be en made t o
incorporate Par ity Error modif icat ions (s ee Lev .

03). The print ed circ uit r emains at le vel 01.

WARNING: Does not incorporate the wirings of the
previous level (problem with OS/2).

New BIOS (see the spec ific table) for th e game
port. This BIOS is only pr ese nt on PCS mod els.
For alignment of th e different levels, a fictitious
level upgrade from 07 to 08 was made for the
BA2034/39 of M4-XX system s. For the BA2032,
the fictitious level upgr ade was made from 06 to 07
to correctly docum en t (witho ut skipping leve ls) the
distributio n of the BIOS am ong the PCS and M4 ­XX models).

New printed circuit ( C.S. 02) which incorpor at es t he
wirings and has a 68 pF capacitor at location C412.

New BIOS (see the spec ific table) .
New 74LS245 and GD752 32 compo nent s that
replace the 74ALS245 and SN75C185,
respectively.

Replaced resist or s and ca pacit or s to correct the
following video problems:

- Comet effect visible at a resolution of
1024x768 with a 72 Hz vertical sync.

- Incorrect compensation between the modulation
of a line and the modulation of a dot (the
horizontal l ine is bright er than t he ver tic al one) .

2

Lev. 11/A

Lev. 1.10/S

Cuts, wirings and the add ition of a resist or to
correct syst em failures wh en COGENT / WANG
boards are used.

Lev. 12/A

Lev. 1.13/S
PDKA

- New BIOS (see specific ta ble)

- Increase in CMOS VBATT marg in s durin g
stand by.

Lev.
13MD/A

Lev. 1.13/S

1000 pF capacitor insta lled at location CA1 to
eliminate the noise on IRQ1 4 which caus es syste m
failures with certain types of Quantum hard disk
drives (170 MB and 34 0 MB) .

Lev.
12MI/A

Lev. 1.13/S

Replaced the 1 O hm re sist ors at location s R148
and R149 with 0 Ohm resistor s. This cor re cts th e
screen’s backgro und inst ab ilit y in Windows and
OS/2 when accessing HDUs and FDUs.

M4-4x / M4-6x / PCS4xx 2-21

LEVEL D.R.S.

Nasc.

BA2050

ROM BIO S NOTES

CODE

589581 Q Lev. 2.0

Motherbo ard used on the following PC models:
M4-64; M4-6 5; M4-66 ( Ma de in Scar ma gno)
Features - Type T. 1.5 (BA2067)

- No CPU (Depends on the

Personal Compu te r m odel)

- Two serial ports

Lev. 01
Lev. 02

Field level

Lev. 03
Field level

Lev. 04
Field level

Lev. 05
Field level

Lev. 06
Field level

Lev. 2.0
Lev. 2.03 PD2C

Lev. 2.03

Lev. 2.06 PDK0

Lev. 2.06

Lev. 2.06

- New BIOS (see the spec ific table) .
Since this board is no longer manuf actur ed, it is
replaced by BA2070. Board level change is only
made at field level.

- Replaced resist or s and ca pacit or s to correct the
following video problems:

- Comet effect visible at a reso lu tion of

1024x768 with a 72 Hz vertica l sync.

- Incorrect compen sation betwee n th e

modulation of a line and the modulat ion of a
dot (the horizontal line is bright er than the
vertical one).

Cuts and wirings to correct WAN (LPU) bo ard
failures.

- New BIOS (see spec ific table)

- Increase in CMOS VBATT mar gins dur in g
stand by.

Cuts, wirings and the ad dition of a resistor to
correct syste m failures when CO GENT / WANG
boards are used .

1000 pF capac itor in sta lled at locatio n CA1 to
eliminate the noise on IRQ14 which causes syst em
failures with certain types of Quant um hard disk
drives (170 MB and 340 MB).

2-22 M4-4x / M4-6x / PCS4xx

LEVEL D.R.S.

Nasc.

BA2076

CODE

ROM BIOS NOTES

Lev. 2.0

Motherboa rd used on the f ollowing PC mo dels:
M4-64; M4-65; M4-66 (Made in Scarmagno)
Features: - Type T. 1.5 (BA2070)

- No CPU (Depends on the
Personal Comput er mo del)

- Two serial ports

2

Lev. 01
Lev. 02

Lev. 03

Lev. 04

Lev. 05

Lev. 06

Lev. 2.03 PD2C
Lev. 2.03

Lev. 2.04 PD2R

Lev. 2.04

Lev. 2.06 PDK0

Lev. 2.06

New BIOS (see the spec ific table) .
Replaced resist or s and ca pacit or s to correct the

following video problems:

- Comet effect visible at a resolution of
1024x768 with a 72 Hz vertical sync.

- Incorrect compensation between the modulation
of a line and the modulation of a dot (the
horizontal l ine is bright er than t he ver tic al one) .

Intel has modified t he CPU id ent ifier by using the
one for the SL Enhanced family, not recognized by
the previous BIOS 2.03.
This BIOS level does not allow the use of the SL
Enhanced CPU.

Cuts and wirings to cor re ct WAN boa rd (LPU)
failures.

- New BIOS (see specific ta ble)

- Increase in CMOS VBATT marg in s durin g
stand by.

Cuts, wirings and the add ition of a resist or to
correct syst em failures wh en COGENT / WANG
boards are used.

Lev. 07

Lev. 2.06

New printed circuit ( le vel 02) that incorpo rates the
wirings that corrected the problems that occurred
when using WAN boar ds - See le vel 04.

Lev. 08

Lev. 2.06

1000 pF capacitor insta lled at location CA1 to
eliminate the noise on IRQ1 4 which caus es syste m
failures with certain types of Quantum hard disk
drives (170 MB and 34 0 MB) .

Lev. 09

Lev. 2.06

New printed circuit inco rpo rat ing all pre vious
modifications: WAN boards

COGENT / WANG boards
Increased VBATT value

M4-4x / M4-6x / PCS4xx 2-23

LEVEL D.R.S.

Nasc.

BA2051

ROM BIO S NOTES

CODE

589581 Q Lev. 2.0

Motherbo ard used on the following PC models:
M4-64; M4-6 5; M4-66 ( Made in S ingapo re)
Features - Type T. 1.5 (BA2067)

- No CPU (Depends on the

Personal Compu te r m odel)

- Two serial ports

Lev. 01
Lev. 02

Field level

Lev. 03
Field level

Lev. 04
Field level

Lev. 05
Field level

Lev. 06
Field level

Lev. 2.0
Lev. 2.03 PD2C

Lev. 2.03

Lev. 2.06 PDK0

Lev. 2.06

Lev. 2.06

- New BIOS (see the spec ific table) .
Since this board is no longer manuf actur ed, it is
replaced by BA2077. Board level change is only
made at field level.

- Replaced resist or s and ca pacit or s to correct the
following video problems:

- Comet effect visible at a reso lu tion of

1024x768 with a 72 Hz vertica l sync.

- Incorrect compen sation betwee n th e

modulation of a line and the modulat ion of a
dot (the horizont al line is bright er than the
vertical one).

Cuts and wirings to correct WAN (LPU) bo ard
failures.

- New BIOS (see spec ific table)

- Increase in CMOS VBATT mar gins dur in g
stand by.

Cuts, wirings and the ad dition of a resistor to
correct syste m failures when CO GENT / WANG
boards are used .

1000 pF capac itor in sta lled at locatio n CA1 to
eliminate the noise on IRQ14 which causes syst em
failures with certain types of Quant um hard disk
drives (170 MB and 340 MB).

2-24 M4-4x / M4-6x / PCS4xx

LEVEL D.R.S.

Lev.
Nasc.

BA2077

CODE

ROM BIOS NOTES

Lev. 2.0

Motherboa rd used on the f ollowing PC mo dels:
M4-64; M4-65 ; M4- 66 (Mad e in Sing apor e)
Features: - Type T. 1.5 (BA2070)

- No CPU (Depends on the
Personal Comput er mo del)

- Two serial ports

2

Lev. 01
Lev. 02

Lev. 03

Lev. 04

Lev. 05

Lev. 06

Lev. 2.03 PD2C
Lev. 2.03

Lev. 2.04 PD2R

Lev. 2.04

Lev. 2.06 PDK0

Lev. 2.06

New BIOS (see the spec ific table) .
Replaced resist or s and ca pacit or s to correct the

following video problems:

- Comet effect visible at a resolution of
1024x768 with a 72 Hz vertical sync.

- Incorrect compensation between the modulation
of a line and the modulation of a dot (the
horizontal l ine is bright er than t he ver tic al one) .

Intel has modified t he CPU id ent ifier by using the
one for the SL Enhanced family, not recognized by
the previous BIOS 2.03.
This BIOS level does not allow the use of the SL
Enhanced CPU.

Cuts and wirings to cor re ct WAN boa rd (LPU)
failures.

- New BIOS (see specific ta ble)

- Increase in CMOS VBATT marg in s durin g
stand by.

Cuts, wirings and the add ition of a resist or to
correct syst em failures wh en COGENT / WANG
boards are used.

Lev. 07

Lev. 2.06

New printed circuit ( le vel 02) that incorpo rates the
wirings that corrected the problems that occurred
when using WAN boar ds (LPU) - See level 04.

Lev. 08

Lev. 2.06

1000 pF capacitor insta lled at location CA1 to
eliminate the noise on IRQ1 4 which caus es syste m
failures with certain types of Quantum hard disk
drives (170 MB and 34 0 MB) .

Lev. 09

Lev. 2.06

New printed circuit inco rpo rat ing all pre vious
modifications: WAN boards

COGENT / WANG boards
Increased VBATT value

M4-4x / M4-6x / PCS4xx 2-25

LEVEL D.R.S.

Nasc.

BA2063

ROM BIO S NOTES

CODE

589580 T Lev. 2.0

Motherbo ard used on the M4-60 Per son al
Comp uter:
(Made in Scarmagno)
Features: - Type T. 1.5 (BA2067)

- 25 MHz i486SX CPU

- Two serial ports

Lev. 01
Lev. 02

Field level

Lev. 03
Field level

Lev. 04
Field level

Lev. 05
Field level

Lev. 2.0
Lev. 2.03 PD2C

Lev. 2.03

Lev. 2.06 PDK0

Lev. 2.06

- New BIOS (see the spec ific table) .
Since this board is no longer manuf actur ed, it is
replaced by BA2078. Board level change is only
made at field level.

- Replaced resist or s and ca pacit or s to correct the
following video problems:

- Comet effect visible at a reso lu tion of

1024x768 with a 72 Hz vertica l sync.

- Incorrect compen sation betwee n th e

modulation of a line and the modulat ion of a
dot (the horizont al line is bright er than the
vertical one).

Cuts and wirings to correct WAN (LPU) bo ard
failures.

- New BIOS (see spec ific table)

- Increase in CMOS VBATT mar gins dur in g
stan d b y

- SL Enhanced 25 MHz i486SX CPU used .

Cuts, wirings and the ad dition of a resistor to
correct syste m failures when CO GENT / WANG
boards are used .

Lev. 06
Field level

Lev. 2.06

1000 pF capac itor in sta lled at locatio n CA1 to
eliminate the noise on IRQ14 which causes syst em
failures with certain types of Quant um hard disk
drives (170 MB and 340 MB).

2-26 M4-4x / M4-6x / PCS4xx

LEVEL D.R.S.

Nasc.

BA2078

Lev. 01

ROM BIOS NOTES

CODE

589580 T Lev. 2.0

Lev. 2.03 PD2C

Motherboa rd used on t he M4- 60 Per sona l
Computer (Made in Scarmagno).
Features: - Type T. 1.5 (BA2070)

- 25 MHz i486SXCPU

- Two serial ports

New BIOS (see the spec ific table) .

2

Lev. 02

Lev. 03

Lev. 04

Lev. 05

Lev. 06

Lev. 07

Lev. 2.03

Lev. 2.04 PD2R

Lev. 2.04

Lev. 2.06 PDK0

Lev. 2.06

Lev. 2.06

Replaced resist or s and ca pacit or s to correct the
following video problems:

- Comet effect visible at a resolution of
1024x768 with a 72 Hz vertical sync.

- Incorrect compensation between the modulation
of a line and the modulation of a dot (the
horizontal l ine is bright er than t he ver tic al one) .

Intel has modified t he CPU id ent ifier by using the
one for the SL Enhanced family, not recognized by
the previous BIOS 2.03.
This BIOS level does not allow the use of the SL
Enhanced CPU.

Cuts and wirings to cor re ct WAN boa rd (LPU)
failures.

- New BIOS (see specific ta ble)

- SL Enhanced 25 MHz i486SX CPU is used

- Increase in CMOS VBATT marg in s durin g
stand by.

Cuts, wirings and the add ition of a resist or to
correct syst em failures wh en COGENT / WANG
boards are used.

New printed circuit ( le vel 02) that incorpo rates the
wirings that corrected the problems that occurred
when using WAN boar ds - See le vel 04.

Lev. 08

Lev. 2.06

1000 pF capacitor insta lled at location CA1 to
eliminate the noise on IRQ1 4 which caus es syste m
failures with certain types of Quantum hard disk
drives (170 MB and 34 0 MB) .

Lev. 09

Lev. 2.06

New printed circuit inco rpo rat ing all pre vious
modifications: WAN boards

COGENT / WANG boards
Increased VBATT value

M4-4x / M4-6x / PCS4xx 2-27

LEVEL D.R.S.

Nasc.

BA2064

Lev. 01

ROM BIO S NOTES

CODE

589580 T Lev. 2.0

Lev. 2.0

Motherbo ard used on the M4-60 Per son al
Comput er (Made in S ingapo re) .
Features: - Type T. 1.5 (BA2067)

- 25 MHz i486SX CPU

- Two serial ports

Lev. 02
Field level

Lev. 03
Field level

Lev. 04
Field level

Lev. 05
Field level

Lev. 06
Field level

Lev. 2.03 PD2C

Lev. 2.03

Lev. 2.03

Lev. 2.06 PDK0

Lev. 2.06

Lev. 2.06

- New BIOS (see the spec ific table) .
Since this board is no longer manuf actur ed, it is
replaced by BA2079. Board level change is only
made at field level.

- Replaced resist or s and ca pacit or s to correct the
following video problems:

- Comet effect visible at a reso lu tion of

1024x768 with a 72 Hz vertica l sync.

- Incorrect compen sation betwee n th e

modulation of a line and the modulat ion of a
dot (the horizont al line is bright er than the
vertical one).

Cuts and wirings to correct WAN (LPU) bo ard
failures.

- New BIOS (see spec ific table)

- Increase in CMOS VBATT mar gins dur in g
stand by.

- SL Enhanced 25 MHz i486SX C PU

Cuts, wirings and the ad dition of a resistor to
correct syste m failures when CO GENT / WANG
boards are used .

1000 pF capac itor in sta lled at locatio n CA1 to
eliminate the noise on IRQ14 which causes syst em
failures with certain types of Quant um hard disk
drives (170 MB and 340 MB).

2-28 M4-4x / M4-6x / PCS4xx

LEVEL D.R.S.

Nasc.

BA2079

Lev. 01

ROM BIOS NOTES

CODE

589580 T Lev. 2.0

Lev. 2.03 PD2C

Motherboa rd used on t he M4- 60 Per sona l
Computer (Made in Singapor e) .
Features: - Type T. 1.5 (BA2070)

- 25 MHz i486SXCPU

- Two serial ports

New BIOS (see the spec ific table) .

2

Lev. 02

Lev. 03

Lev. 04

Lev. 05

Lev. 06

Lev. 07

Lev. 2.03

Lev. 2.04 PD2R

Lev. 2.04

Lev. 2.06 PDK0

Lev. 2.06

Lev. 2.06

Replaced resist or s and ca pacit or s to correct the
following video problems:

- Comet effect visible at a resolution of
1024x768 with a 72 Hz vertical sync.

- Incorrect compensation between the modulation
of a line and the modulation of a dot (the
horizontal l ine is bright er than t he ver tic al one) .

Intel has modified t he CPU id ent ifier by using the
one for the SL Enhanced family, not recognized by
the previous BIOS 2.03.
This BIOS level does not allow the use of the SL
Enhanced CPU.

Cuts and wirings to cor re ct WAN boa rd (LPU)
failures.

- New BIOS (see specific ta ble)

- SL Enhanced 25 MHz i486SX CPU is used

- Increase in CMOS VBATT marg in s durin g
stand by.

Cuts, wirings and the add ition of a resist or to
correct syst em failures wh en COGENT / WANG
boards are used.

New printed circuit ( le vel 02) that incorpo rates the
wirings that corrected the problems that occurred
when using WAN boar ds - See le vel 04.

Lev. 08

Lev. 2.06

1000 pF capacitor insta lled at location CA1 to
eliminate the noise on IRQ1 4 which caus es syste m
failures with certain types of Quantum hard disk
drives (170 MB and 34 0 MB) .

Lev. 09

Lev. 2.06

New printed circuit inco rpo rat ing all pre vious
modifications: WAN boards

COGENT / WANG boards
Increased VBATT value

M4-4x / M4-6x / PCS4xx 2-29

LEVEL D.R.S.

Nasc.

BA2068

Lev. 01

CODE

ROM BIO S NOTES

Lev. 2.0

Motherbo ard used on the M4-60 Per son al
Comput er (Made in S ingapo re) .
Features: - Type T. 1.5 (BA2067)

Lev. 2.0

- 25 MHz i486SX CPU

- Two serial ports

Lev. 02
Field level

Lev. 2.03 PD2C

- New BIOS (see the spec ific table) .
Since this board is no longer manuf actur ed, it is
replaced by BA2079. Board level change is only
made at field level.

Lev. 2.03

- Replaced resist or s and ca pacit or s to correct the
following video problems:

- Comet effect visible at a reso lu tion of

1024x768 with a 72 Hz vertica l sync.

- Incorrect compen sation betwee n th e

modulation of a line and the modulat ion of a
dot (the horizont al line is bright er than the
vertical one).

Lev. 03
Field level

Lev. 04
Field level

Lev. 2.03

Lev. 2.06 PDK0

Cuts and wirings to correct WAN (LPU) bo ard
failures.

- New BIOS (see spec ific table)

- Increase in CMOS VBATT mar gins dur in g
stand by.

- SL Enhanced 33 MHz i486SX C PU

Lev. 05
Field level

Lev. 2.06

Cuts, wirings and the ad dition of a resistor to
correct syste m failures when CO GENT / WANG
boards are used .

Lev. 06
Field level

Lev. 2.06

1000 pF capac itor in sta lled at locatio n CA1 to
eliminate the noise on IRQ14 which causes syst em
failures with certain types of Quant um hard disk
drives (170 MB and 340 MB).

Nasc. Lev. 2.06 Motherboard manuf act ur ed in Scar ma gno

exclu s iv el y fo r Ol iservice .
Features: - Type T. 1.5 (BA2070)

- No CPU

BA2184

New motherboard implementing the modifications
for operation with the KING STO N ne two rk.

2-30 M4-4x / M4-6x / PCS4xx

LEVEL D.R.S.

Nasc.

BA2183

CODE

ROM BIOS NOTES

Lev. 2.06 Motherboard manu fact ure d in Singapor e

excl usi v el y f or O l i service .
Features: - Type T. 1.5 (BA2054)

- No CPU
New motherboa rd implem ent ing t he m odif icat ions
for operatio n with the KI NG STO N net wor k.

2

Lev. 01

The level 13 modif icat ion (CO GENT/ W ANG
boards) has been eremoved. To corre ct this
problem, new motherboard BA2187 is

manufac tur ed e x cl usi vel y for O l iservice.

Nasc Lev. 2. 06 Motherboard for Oliser vi ce onl y.

Features: - Type T. 1.5 (BA2054)

- No CPU

BA2187

New board implement ing t he modifications for
operation with t he CO GENT / WANG boa rds.

M4-4x / M4-6x / PCS4xx 2-31

MOTHERBOARD INTEGRATED CONTROLLERS

MOTHER­BOARD

T.1 (BA2054)
BA2032
BA2034
BA2039
BA2183
BA2187

T.1 (BA2044)
BA2033
BA2036

T.1.5 (BA2067)
BA2050 BA2051
BA2063 BA2064
BA2068

T.1.5 (BA2070)
BA2076 BA2077
BA2078 BA2079
BA2184

INTEGRATED CONTROLLERS

CPU: i486SX @ 25 MHz (soldered QFP)
OverDri ve II Per form anc e Upgr ade Soc ket: This socket can host the

following processor s: i486SX @ 33 MH z

i486DX @ 33 MHz
i487SX @ 25 MHz or 33 MHz
i486DX2 @ 50 MHz or 66 MHz

ET6000 This component integrat es the following f unct ions :

- Geneation of syst em Reset and synchron izat io n signals

- System bus and CPU cont ro l

- Control of the opera tion s and ar bit ration be twe en dev ic e
masters, DMA and memory refresh

- Control port B and NMI logic register s

- Port 92 logic control

- Memory controller

- Concurrent mem ory refre sh and norm al PC refr esh co ntrol

- BIOS shadowing control

- Management of the inter f ace be twe en t he sys te m’s thr ee
buses

- CPU local data bus (16-bit )

- Memory dat a bus (32- bit)

- I/O peripherals d a ta bus (16-b it)

- Parity checking

- Math coproce ssor inte rface

- Clock generatio n

BIOS EPROM Socket installe d 128 Kb x 8 27c010- 120
83C206Q System per ipheral contro l le r. This component integrates t he

followin g funct ions:

- CMOS RAM - 114 bytes of non-vo la tile RAM backe d up

by a lithium battery to maintain the data while the system
is powered off.

- Real Time Clock (system date and time)

- DMA control

- Interr upt contr o l

PC87310 Super I/O. This co mponen t integr at es the f ollowing funct ions :

- Floppy disk control

- Interf a c e fo r t he t wo ser ia l po rt s

- Interface for the parallel port

- Interface for the intelligent hard disks

8042 Keyboard and mous e cont ro ller
ICD2023 Programmable system clock generator

- Timer

- Local address bu s interface

CL-GD5428 Enhanced VGA video controller
The difference with respect to the prev io us boa rd is that th is new boar d is

available with a Pentiu m Ove rDr ive Ready Socket so that the Pent ium -b ased
P24T proces sor can be installed.

Replace the BA2050 - BA2051 - BA2063 - BA2064 - BA2068 boards.

2-32 M4-4x / M4-6x / PCS4xx

BOARDS

FUNCTION DESCRIPTION D.R.S. CO D E FEATURES

Motherboard
Motherboard

T.1 (2054)
T.1 (2044)
T.1.5 (2067)
T.1.5 (2070)

See the BA tables

Base Assembly for M4-XX
Base Assembly for PCS XX
Base Assembly for M4-6 X
Base Assembly for M4-6 X

2

PS11 A power supply
PS11 A power supply
PS11 AR power supply
PS11 AR power supply

LA/11 BNMB power supply
LA/16 BNMB power supply

BUS Adapter board
BUS Adapter board

Console board

220 V
115 V
220 V
115 V

110 V
220 V

IN2003
IN 2016

IF2010

588062 Z
589579 D

558184 S
558185 T

030099 W
588416 R

588304 H
588196 M

USER PROGRAM

This progra m is stored in th e har d disk’s System Region s.

M4-40, M4-46
LEVEL NOTES

Lev. 1.02
Lev. 1.04

upd 1

This version has t he following cor re ct ive upda te s:

- The mouse t est has be en opt im iz ed.

- The memory t est has be en opt im iz ed.

- New messages have bee n adde d.

- The video configuration uti l ity now allows new monito rs to be added.

- The cache subtest of th e CPU test has been modified.

- The hard disk test has been modified.

- This version allows the configurat ion of hig h-capac ity hard disks.

- The Setup Utility now cor rec tly disp lays sha dow m emory capac ity.

- The system’s logot ype has been added.
Requires BIOS level 2. 06.

Power supply used on
systems equipped with a
305 BOX case

Power supply used on
systems equipped with a
microtower case

For microtower systems
For 305 BOX syst em s

For 305 BOX syst em s
For microtower systems

Lev. 1.05

This version has t he following cor re ct ive upda te s:

- The Setup Utility has been modified .

- The new HDU Fast Access Utility has been added al lowing mu lti-sect or
Read/Write opera tions.

- The keyboard test has been modified.

- Floppy disk tests have been added.

- Video tests have been added.

Requires BIOS level 2. 06.

M4-4x / M4-6x / PCS4xx 2-33

M4-60, M4-62, M4-64, M4-65, M4-66
LEVEL NOTES

Lev. 1.01

This version includes the following corrective up dates:

- New messages have be en add ed

- The Video Configur at ion Ut ility now allows the add ition of new monit or s.

- The cache subtes t of the CPU test has been modified .

- The hard disk test has be en m odif ie d.

- This version a llows th e conf igur ation of high- capa city hard disks.

- The Setup Ut ility now cor rect ly dis plays sh adow mem or y capacity .

- The system ’s logot yp e has be en add ed.
Requires BIOS level 2.0.

Lev. 1.02

Lev. 1.03

Lev. 1.04
upd 1

This version includes the following corrective up dates:

- New messages have be en add ed

- The Video Configur at ion Ut ility now allows the add ition of new monit or s.

- The cache subtes t of the CPU test has been modified .

- The hard disk test has be en m odif ie d.

- High-capacit y hard disks ca n now be co nfig ure d.
Requires BIOS level 2.0.

This version includes the following corrective up dates:

- The Setup Ut ilit y has be en m odif ied.

- The new HDU Fast Access Utilit y has been add ed allowing m ulti- sect or
Read/Write operations.

- The keyboard te st has been mo dified .

- Floppy disk tests have been added.

- Video tests have been add ed.

Requires BIOS level 2.06.
This version includes the following corrective up dates:

- The mouse test has been op tim ized.

- The memory test has been op timized.

- New messages have be en add ed.

- The Video Configur at ion Ut ility now allows new monit or s to be added.

- The cache subtes t of the CPU test has been modified .

- The hard disk test has be en m odif ie d.

- High-capacit y hard disks ca n now be co nfig ure d.

- The Setup Ut ility now cor rect ly dis plays sh adow mem or y capacity .

- The system ’s logot yp e has be en add ed.

Requires BIOS level 2.06.

Lev. 1.05

This version includes the following corrective up dates:

- The Setup Ut ilit y has be en m odif ied.

- The new HDU Fast Access Utilit y has been add ed allowing m ulti- sect or
Read/Write operations.

- The keyboard te st has been mo dified .

- Floppy disk tests have been added.

- Video tests have been add ed.

Requires BIOS level 2.06.

2-34 M4-4x / M4-6x / PCS4xx

PCS 44/C, PCS 46/C
LEVEL NOTES

Lev. 1.00
Lev. 1.01

Lev. 1.03
upd 1

Lev. 1.04
upd 1

This version includes the following corr ective upd ates:

- A test on dedicated memory has been added.

- The floppy disk test can now check 1.2 MB drives.

- The keyboard test has been modified.

- The CPU test has been modif ied.

- The logotype ha s been chang ed for the new Personal Comput er mod els.

- The video test has been modifie d.
This version includes the following corr ective upd ates:

- The mouse t est has be en opt im iz ed.

- The memory t est has be en opt im iz ed.

- New messages have bee n adde d.

- The Video Configurat ion Utility now al lows new monit ors to be added .

- The cache subtest of th e CPU test has been modified.

- The hard disk test has been modified.

- High-capacity hard disks can now be configured.

- The Setup Utility now cor rec tly disp lays sha dow m emory capac ity.

- The system’s logot ype has been added.
Requires BIOS level 2.0/ S

This version includes the following corr ective upd ates:

- The Setup Utility has been modified .

- The new HDU Fast Access Utility has been added al lowing mu lti-sect or
Read/Write opera tions.

- The keyboard test has been modified.

- Floppy disk tests have been added.

- Video tests have been added.

Requires BIOS level 2. 06/ S

2

M4-4x / M4-6x / PCS4xx 2-35

SYSTEM TEST

M4-40, M4-46, M4-60, M4-62, M4-64, M4-65, M4-66
LEVEL NOTES

Lev. 1.02
Lev. 1.03

Lev. 1.05

Lev. 1.06

This version includes the following corrective up dates:

- A test on dedicated m emory has been adde d.

- The floppy disk test can now chec k 1.2 MB drives.

- The keyboard te st has been mo dified .

- The CPU test has been modified.

- The logotype has bee n chan ged for the new Pers onal Com put er models.

- The video test has been modif ied.
This version includes the following corrective up dates:

- The mouse test has been op tim ized.

- The memory test has been op timized.

- New messages have be en add ed.

- The Video Configur at ion Ut ility now allows new monit or s to be added.

- The cache subtes t of the CPU test has been modified .

- The hard disk test has be en m odif ie d.

- High-capacit y hard disks ca n now be co nfig ure d.

- The Setup Ut ility now cor rect ly dis plays sh adow mem or y capacity .

- The system ’s logot yp e has be en add ed.
Requires BIOS level 2.0.

This version includes the following corrective up dates:

- The Setup Ut ilit y has be en m odif ied.

- The new HDU Fast Access Utilit y has been add ed allowing m ulti- sect or
Read/Write operations.

- The keyboard te st has been mo dified .

- Floppy disk tests have been added.

- Video tests have been add ed.

Requires BIOS level 2.06.

Lev. 1.07

2-36 M4-4x / M4-6x / PCS4xx

This version includes the following corrective up dates:

- The memory test has been modif ied.

- Floppy disk tests have been added.

Requires BIOS level 2.06.

PCS 44/C, PCS 46/C
LEVEL NOTES

Lev. 1.01
Lev. 1.02

Lev. 1.04

Lev. 1.05

This version includes the following corr ective upd ates:

- A test on dedicated memory has been added.

- The floppy disk test can now check 1.2 MB drives.

- The keyboard test has been modified.

- The CPU test has been modif ied.

- The logotype ha s been chang ed for the new Personal Comput er mod els.

- The video test has been modifie d.

- The Setup Utility has been opt imize d.
This version includes the following corr ective upd ates:

- The mouse t est has be en opt im iz ed.

- The memory t est has be en opt im iz ed.

- New messages have bee n adde d.

- The Video Configurat ion Utility now al lows new monit ors to be added .

- The cache subtest of th e CPU test has been modified.

- The hard disk test has been modified.

- High-capacity hard disks can now be configured.

- The Setup Utility now cor rec tly disp lays sha dow m emory capac ity.

- The system’s logot ype has been added.
Requires BIOS level 2. 0/ S.

This version includes the following corr ective upd ates:

- The Setup Utility has been modified .

- The new HDU Fast Access Utility has been added al lowing mu lti-sect or
Read/Write opera tions.

- The keyboard test has been modified.

- Floppy disk tests have been added.

- Video tests have been added.

Requires BIOS level 2. 06/ S.

2

Lev. 1.06

M4-4x / M4-6x / PCS4xx 2-37

This version includes the following corr ective upd ates:

- The memory t est has be en m odif ie d.

- Floppy disk tests have been added.

Requires BIOS level 2. 06/ S.

SYSTEM REGION SETUP

M4-40, M 4-46
LEVEL NOT ES

Lev. 1.04
Lev. 1.06

Lev. 1.07

M4-60, M4-62, M4-64, M4-65, M4-66
LEVEL NOTES

Lev. 1.00
Lev. 1.01

Lev. 1.02

Lev. 1.03

Lev. 1.06

Lev. 1.07

PCS 44/C, PCS 46/C
LEVEL NOT ES

Lev. 1.00

Allows User Disk Lev. 1.04, Upd. 1, to be autom atically inst alled on t he ha rd disk.
Requires BIOS level 2.0.

Allows User Disk Lev. 1.05 to be automatical ly installed on the hard disk.
Requires BIOS level 2.06.

Allows User Disk Lev. 1.01 to be automatical ly installed on the hard disk.
Requires BIOS level 2.0.

Allows User Disk Lev. 1.02 to be automatical ly installed on the hard disk.
Requires BIOS level 2.0.

Allows User Disk Lev. 1.03 to be automatical ly installed on the hard disk.
Requires BIOS level 2.06.

Allows User Disk Lev. 1.04, Upd. 1, to be autom atically inst alled on t he ha rd disk.
Requires BIOS level 2.06.

Allows User Disk Lev. 1.05 to be automatical ly installed on the hard disk.
Requires BIOS level 2.06.

Allows User Disk Lev. 1.00 to be automatical ly installed on the hard disk.
Lev. 1.01
Lev. 1.03
Lev. 1.04

upd 1

2-38 M4-4x / M4-6x / PCS4xx

Allows User Disk Lev. 1.01 to be automatical ly installed on the hard disk.

Allows User Disk Lev. 1.03, Upd. 1, to be autom atically inst alled on t he ha rd disk.

Allows User Disk Lev. 1.04, Upd. 1, to be autom atically inst alled on t he ha rd disk.

POWER SUPPLY

POWER SUPPLY LEVEL DESCRIPTION

PS11 A - 220 V

PS11 A - 115 V

PS11 AR - 220 V

PS11 AR - 115 V

LA/11 BNMB

LA/16 BNMB

BUS EXPANSION BOARD

NAME LEVEL DESCRIPTION

IN 139 Nasc. Bus expansion board for Microtower case sy stem s.

IN2003 Nasc.

Bus expansion board for 305 BO X case system s.

2

Lev. 01

Modified prin ted circu it.

IN2016 Nasc. Bus expansion board for 305 BOX case system s.

SOFTWARE DRIVERS

DRIVER NOTES

EVD Rel 1.00

Video drivers for: Windows 3. 1 ( Beta release only)

OS/2 v. 2.0
Lotus 123 v. 3.x
Ventura v. 2 & V. 3
AutoDESK

EVD Rel. 1.02

- Final driver version for Windows 3.1

- Modificat ions f or Auto d esk an d OS/2
EVD Rel. 1.03
EVD Rel. 1.03 Rev. 1.0
EVD Rel. 1.04

New drivers for OS/2 v. 2.1 and Win dows 3. 1
OS/2 drivers reorgan iz ed to cor rec t installat ion pr oblem s.

- Corrects the CTRL ALT DEL problem with Windows 3.1

- Corrects the problems with Autocad 12

- Corrects the prob lems with t he doc umentation
EVD Rel. 1.05

- Windows 3.1 driver s have been m odif ied to improve this

program’s performance.

- A new video driver specific for Windows NT Ver. 3.1 is used.
EVD Rel. 1.06

- Corrects the proble m of the 102 4x76 8, 256 col. 60/ 72 Hz dr iver s

which can only work with 16 colors in Windows NT.

- Incorrect CLO CK acces sor y manage me nt; problem s in display ing

the fonts selecte d w ithin CLOCK.

- DOS window (ALT-ENT ER) con ta ins cont am inat ed lines.

- Keyboard codepage 437 gen era tes a few incorr ect cod es.
EVD Rel. 1.07

- Updates the Windows 3. 1 video drivers bas ed on t he Cirr us ver.

1.43 componen t.

- Corrects the Windows 3.1 CTRL ALT DEL problem .

- Updates the documentat ion.

M4-4x / M4-6x / PCS4xx 2-39

BIOS

LEVEL NOTES

Lev. 1.02
Lev. 1.03

Lev. 1.05

Lev. 1.07

- New shadow RAM manageme nt :

- System and video shadow BI O S enab led - This option do es not cha nge.

- System shadow BIO S enab le d, video sha dow BIOS disabled - This opt ion
is only available if the video ROM BI OS is not the on e on the m other board.

- System and video BIOS disabled - This option is no longer available.

- New ways to configure the para llel and seria l ports.

- Problem with the joystick correct ed .

- Video problems corrected.
This release correct s the following prob lems :

- With a Comput one bo ard insta lled at addre ss 800 0:0, the system would crash
when the CTRL ALT DEL key sequence was pre ssed during the POD.

- Incorrect memory size display.

- Inability to insta ll the driv ers for Autocad Rev. 1.00.

- The new BIOS vers io n allo ws the ma nage me nt of the 56 Hz and interlac ed
87 Hz video frequencies.

This version correct s the following prob lems :

- In version 1.05 , the True Color s modes could hav e been set even if only
512 KB of video memory was installed, thus causing malfunc tion s. 1 MB of
video RAM is required for True Color s operat ion.

- INT 10h - func. 12h - subfunc . 80h (inqu ire Cirr us VGA Cont ro ller Type) is a

non-standar d video BIOS f unct ion that has been int egr ated t o make t he Cirr us

video drivers for AutoCAD work. In BIOS ve rsion 1.0 5, this func tion only

recognized the Cirr us GD5 4 28 video driver as GD5426

since the video drivers were not yet develop ed to work with the GD542 8.
Version 1.02 of these video dr iver s also recogn ized the G D542 8 video
controller and there fore the I nqu ire Cirr us VGA Cont ro ller Type fun ctio n was
re-enabled in BIOS ver sion 1.06 ( which nev er went out of produc tion ).
As a result of these problems, the compatibility between the BI OS and video
drivers for AutoCAD is the following:

BIOS VIDEO DRIVER OPERATION

1.05 1.00 YES

1.05 1.02 YES

1.07 1.00 NO

1.07 1.02 YES

- The DSM27-028 and DSM27 -03 9 mo nito rs were incorre ct ly handled in
version 1.05.

Lev. 2.0

This version cor re cted t he pr oblem concern in g the inst a llation of the OS/ 2
rel. 1.3, ver. 2.02, upd. 6 operating sy st em . The inconv enience was caused by the
fact that the on- boa rd VGA video cont ro ller was re spon ding at addr ess 3C3h
while a video contr ol ler installed on the ex pans io n bus wou ld respond at add res s
46E8h. This BIO S ver sion ens ure s that both cont r ol lers respo nd at addr ess
46E8h.

2-40 M4-4x / M4-6x / PCS4xx

LEVEL NOTES

Lev. 2.03

This version includes the following corr ective upd ates:

- Memory segment E is mad e available so that it could use d as the add ress
range for all the tools t hat use this m em ory area in paged m ode (for exam pl e
EMM386) .

- A HERCULES board installed on the AT bus can no w drive an MDA monit or.

- Windows NT can now be us ed with EVD driver s in high res olut ion mo des.

- The new 26-141PS monit or is now support ed, which can only be se le cted
using the new Syst em Test, Syst em Regions and User D isket t e versions.

- Problems with the vide o drive frequency ar e cor re cted.

- Problems given whe n acce ssing vide o memo ry in 132-co lumn video m odes are
correct ed.

2

Lev. 2.04
This BIOS
level never
reached
wide-scale
production

Lev. 2.06

This version includes the following corr ective upd ates:

- The new CPUs supplied by Intel have a dif feren t identif ier than the one kno wn
to date. Since this id ent ifier is used to display the banne r during t he PO D,
when these CPUs were installed the me ssage displaye d by the banner no
longer provided an indication on the type of CPU nor its clock.
The CPU recognition proc edur e was rewrit t en t o correc t this pr oblem .

- The video BIOS failur e was cor rect ed: in the 132x4 3 video m ode , the font is
displayed incorrect ly, leaving a line of undriven pixels bet we e n one row and the
next.

Revisions 2.06 an d 2.06/ S rep la ce Rev. 2.05 an d 2.05/ S, resp ectively, on which a
multiblock re ad/ writ e on HDU access se tt ing op tion managem en t failure was
detected dur ing the SW Q A phase . Revis ions 2. 05 an d 2.05/ S were not yet in
production.

This version includes the following corr ective upd ates:

- The Personal Com put er no longer cra shes at the en d of the Solit aire game
provided with Windows 3. 1.

- Oversanning in th e 72 Hz 640 x480 video mode was corr ect ed .
This problem came ab out durin g video diag nost ics, when the lower side of
the frame was not displayed on the screen.

- Correction of the video cont ro ller’s f ifo co de pr ogr amming values in t he
different video mo des for video re fresh fun ctio n.

- This BIOS version now op tion a lly handles the multisect or RD/W R function
during hard disk access es (u ser -se lect able by mean s of the Setu p Utility
included in the hard disk’s system regions).

M4-4x / M4-6x / PCS4xx 2-41

For production pur pos es, not al l the board s manuf act ur ed us e BIOS 2. 0 an d have the cuts and
wirings needed to solve th e pro blem s that occur when us in g OS/2 (see Lev. 06).
From here on all board levels will be dealt with differe nt ly, depend in g on whethe r they
incorporta te the modificat ions to correct the pro blem s with OS/ 2 or not.
Another BIOS release 1.XX is t herefore intr oduced.

LEVEL NOTES

This BIOS release is only available for the mot her boa rds that do not integ rate the

modifications neede d to correct the problem s re late d to the use of OS/2 .
Lev. 1.10
Lev. 1.13

Due to a failure during the self -a ckno w ledgem en t of the num be r of ser ial po rts integr at ed on th e
motherboar d, a new BIOS release cal led X.YY/ S was de velope d that will be insta lled on all the
products equipped with a single on -bo ard serial port . These pr odu ct s are: PCS 44/C - PCS 46/ C.

LEVEL NOTES

Lev. 1.07/S

Lev. 2.0/S
Lev. 1.10/S

Lev. 2.04/S
Lev. 2.06/S

Lev. 1.13/S

Corresponds t o the st and ard level 2.0 BIOS.

Corresponds t o the st and ard level 2.0 6 BIOS

This BIOS release is only available for the PCS Per sona l Compute r models. The

only variation with re spec t to the nor mal BIO S ver sion is t hat this releas e takes

into considerat ion t hat these sy stem s are not equippe d w ith two serial p orts but

with a single serial port and a game por t.

Corresponds t o the st and ard BIOS level 1. 07.

Corresponds t o the st and ard BIOS level 2. 0

This BIOS level is used at the facto ry for a shor t period of time.

Correspond t o the st anda rd BIO S level 2. 06.

2-42 M4-4x / M4-6x / PCS4xx

SOFTWARE COMPATIBILITY

OPERATING SYSTEMS NOTES

IBM DISK Oper at ing Syst em , Ver. 3. 30
MS-DOS (Com paq)
IBM DISK Oper at ing Syst em , Ver. 4. 01

MS-DOS Release 6.0
OS/2 Release 2.0
OS/2 Release 1.3 SE

Requires a formatted DSDD diskette
during installation on ha rd disk .

2

IBM Operating Syst em /2 , Ver. 1.1 0 e 1.20
IBM Operating System/2 Extended Edition,

Ver. 1.10 e 1.20
INTERACTIVE 386 /ix, Ver. 2.02

SCO UNIX System V/386, Rev. 3.2.4
SCO XENIX 386, Rev. 2.3

WINDOWS

GEM/3 Deskto p , IBM-PC Ver . 3.13
MS-WINDOWS /286 Ver. 2.11

MULTIMEDIA SOFTWARE PRODUCTS

MS-WINDO W S Ver. 3.0 + MUL TI MEDI A Ver . 1.0
MS-WINDO W S Ver. 3.1 MUL TI MEDI A Appl. test ed)
MS-MDK Multimedia Dev elopm ent kit
AUTHOWARE STAR Ver. 1.0A

The PS/2 mouse is not recognize d.
The PS/2 mouse is not recognize d.

MS-WINDOWS /386 Ver. 2.11
MS-WINDOWS 3 Ver. 3.0

IM-AGE V er . 2. 0
IM-AGE V er . 3. 0
TOOLBOOK Ver. 1.5
MS-MPC SAMPLER

M4-4x / M4-6x / PCS4xx 2-43

HARDWARE COMPATIBI LITY

MODEM I/O INTERFACE PRODUCTS

Hayes Smart modem 24 00 B
Intel Safisf axct ion bo ard

ADAPTEC 1540C SCSI HOST ADAPTER

SCANMAN plus
DIGICOM MODEM FAX Mod. SNM28SR
AT&T 2224 CEO MO DEM
Worlport 1200 m odem

MULTIPORT MOUSE

CHASE AT 16+
CHASE AT 8+
COMPUTONE 8 MULTI PO R T
COMPUTONE 16 MULTIPORT
DIGIBOARD MUL TIPO R T
SPECIALIX SI / 8

IBM PS/2 Mouse

Logitech Bus Mouse

Logitech cordless Radio M ous e

MS-BUS mouse

IBM PS/2 Mouse Ser i al

MS BALL POINTER MOUSEl

MULTIMEDIA NETWORKING AND LAN PRODUCTS

PRO AUDIO SPECTRUM PLUS CARD
SUPER VIDEO WINDOWS
FAST SCREEN MACHINE
Videologic CVA 4000/ISA
SOUND PLASTER PRO
SRS 170 Active Speaker System
SONY SRS 77G Active Spe aker Syst em
SONY CD-ROM DRIVER CDU 541
INTELLITOUCH PC-BUS 4025

3COM Etherlink 16 adapt er 3C507

3COM Etherlink ada pt er 3C5 01

3COM Etherlink II adapt er 3C503

3COM Etherlink III adapt er 3C5 09

3COM Etherlink plus adapt er 3C505

3COM Etherlink plus adapt er 3C603

DECNET ETHER WORKS LC

DEC ETHERWORKS TURBO ADAPTER

DEC ETHERWORKS TURBO TP ADAPTER

IBM PC NETWORK adapt er II

IBM TOKEN RING 16/4 adap ter

IBM TOKEN RING adapter II

MADGE AT RING NODE adapt er

DISPLAYS GRAPHICS PRODUCTS

NEC MULTISYNC 4 FG
NEC MULTISYNC 5 FG

INFOTRONIC XGC

NUMBER NINE GXi Graphicx Copro cess or

SPEA Graphiti HiLite

2-44 M4-4x / M4-6x / PCS4xx

COMPONENT S AND JUMPERS ON THE T.1 MOTHERBO ARD (BA2054) (BA2044)

BUS
EXPANSION
BOARD SLOT

AT CD-ROM
INTERFACE

COMPONENTS ON SIDE A

VIDEO
MEM.

VIDEO
CONN.

VGA
CL-GD
5428

J45

ST

1
SER

J12

J44

CPU

J13

ND

2
SER. *2

J33

J25

J21

PERF.
UPGRADE
SOCKET

8742
J28

BIOS

ET6000

PARALLEL
CONN.

F1
JOYSTICK INTERFACE *

J29

J2

83C206Q PC87310

MOUSE
CONN.

KEYBOARD
CONN.

CD-ROM
CONN.

HDU
CONN.

FDU
CONN.

FDU
CONN.
*1

2

PARITY

BANK 1 MEMORY

4 MB MEMORY BANK

74LS293 or 74HC393

* FOR PCS MODELS ONLY
*1 FO R PERSO NAL CO MPUT ERS WITH M ICRO T OWER CASE O NL Y
*2 THE PCS MODELS HAVE A GAME PORT INSTEAD OF THE 2

ND

SERIAL PORT

EXL5A

M4-4x / M4-6x / PCS4xx 2-45

COMPONENTS ON SIDE B

CLOCK
GENERATOR

EXL7A

2-46 M4-4x / M4-6x / PCS4xx

JUMPERS ON THE T.1 MOTHERBOARD (BA20 54) (BA2044)
Jumper J21 (Seri al Port 1) and J25 ( Seri al Port2) - Serial po rt control.

Position 2-3 The system can be bootst r appe d from th e seria l ports. *
Position 1-2 The system can not be boo tstrapp ed f rom t he ser ial ports.

Jumper J33 - Floppy disk write protect
Position 1-2 The floppy disk drive is writ e pro tect ed.
Position 2-3 The floppy disk drive is not writ e prote ct ed. *
This feature is also valid for the strea ming tape drive s with floppy disk interface .

Jumper J12 - Setup control.
Position 1-2 The User Program res ident in the System Region of the har d disk driv e and

which allows the system to be conf igured, is not executed. If the configuration
of the system has changed, th e only way to reconfigure the sys tem is by
launching the System Test prog ram.
If this security featur e is enable d, the following mess age is display ed at the
end of the Power On Diagnost ics:

Position 2 - 3 If the configuration of the system has changed, the POD will automatically

access the User Pr ogr am which a llows th e syst em to be re conf igur ed. *

Jumper J2 - Number of h ard disks connected.
Jumper IN Only one hard disk is inst al led in the system .
Jumper OUT Two hard disks are installed in the system.

NOTE: Some boa rds may not have this jum per .
Jumper J13 - Mou se interrupt

Position 1 - 2 Mouse interrupt 12 disabled
Position 2 - 3 Mouse interrupt 12 en abled. *

Jumper J44 - CPU clock select ion.
Jumpe r IN 25 MHz
Jumper OUT 33 MHz

Jumper J45 - Not use d.
Jumper s J29 - J28 - Type of pro cess or installed

POD Warning

.

2

TYPE OF PROCESSOR INSTALLED IN THE SYSTEM J29 J28

80486 SX QFP On 1 and 2 On 1 and 2
80486 SX PGA On 2 an d 3 On 1 and 2
80486 DX PGA On 1 and 2 On 2 and 3
80486 SX QFP + 80487 SX PG A copr oces sor On 1 and 2 On 1 and 2
80486 SX QFP + 80486 DX2 PG A Over Drive On 1 and 2 On 1 and 2
80487 SX PGA On 1 and 2 On 1 and 2
80486 DX PGA On 1 and 2 On 2 and 3
80486 DX2 PGA Over Drive On 1 and 2 On 2 and 3

* Default setting.

M4-4x / M4-6x / PCS4xx 2-47

COMPONENTS AND JUMPERS ON THE T.1.5 MOT HERBO ARD (BA2067) (BA2070)

VIDEO
MEM.

CD-ROM
CONN.

F1

COMPONENTS ON SIDE A

BANK 0
4MB OF
MEMORY

VIDEO
CONN.

VGA
CL-GD
5428

J45

ST

1
SERIAL

J12

J13

83C206Q

ND

2
SERIAL *2

J33
J25
J21

BIOS

PARITY

PARALLEL
CONN.

8742

BUS
EXPANSION
BOARD SLOT

JOYSTICK
INTERFACE *

AT CD-ROM
INTERFACE

PC87310

MOUSE
CONN.

KEYBOARD
CONN.

HDU
CONN.

FDU
CONN.

FDU
CONN.
*1

MEMOR Y
BANK 1

J44

ET6000

J47

PENTIUM
OVER.
READY
SOCKET

CPU

J28 J29

* FOR PCS PERSONAL COMPUTER MODELS ONLY
*1 FOR PERSONAL CO M PUTERS WITH M ICRO TOW ER CASE ONL Y
*2 INSTEAD OF THE 2

ND

SERIAL PORT, THE PCS MODELS HAVE A GAME PORT

EXM9A

2-48 M4-4x / M4-6x / PCS4xx

CLOCK
GENERATOR

74LS293 or

EXN3A

74HC393

COMPONENTS ON SIDE B

2

M4-4x / M4-6x / PCS4xx 2-49

JUMPERS ON THE T.1.5 MOTHERBO ARD (BA2 067) (BA2070)
Jumper J21 (Seri al Port 1) and J25 (Seria l Port2 ) - Serial port control.

Position 2-3 The system can be boo tstrapp ed f rom t he serial p orts. *
Position 1-2 The system cannot be bo otst rap ped f rom the se rial por ts .

Jumper J33 - Floppy disk write protect
Position 1-2 The floppy disk drive is writ e prot ect ed.
Position 2-3 The floppy disk drive is not writ e pr ot ect ed. *
This feature is also valid for the st re amin g tape dr ives with floppy disk int erfac e.

Jumper J12 - Se tu p control.
Position 1-2 The User Program re sident in the Syst em Region of the har d disk drive and

which allo ws the syst em t o be configu red , is not execut ed. I f the conf ig ura tion
of the system has changed , the on ly way to reconfig ure the syst em is by
launching the System Test program.
If this security feature is ena bled, the following mes sage is displayed at the end
of the Power On Diagnostics:

Position 2 - 3 If the configuration of the syst em has chang ed, the PO D will autom at ica lly

access the User Program which allows the sys te m to be recon figu red . *

Jumper J13 - Mouse interrupt
Position 1 - 2 Mouse interrup t 12 disabled
Position 2 - 3 Mouse interrup t 12 enabled. *

Jumper J44 - CPU clock select ion.
Jumper IN 25 MHz
Jumper OUT 33 MHz

Jumper J47 - AT bus status selection
Position 1 - 2 Synchronous
Position 2 - 3 Asynchronous . *

Jumper J45 - VGA vide o contr o ller sett ing
Position 1 - 2 On-board VGA cont ro ller disabled
Position 2 - 3 On-board VG A cont ro ller enab led. *

Jumpers J29 - J28 - Type of processor ins ta lle d

POD Warning

.

TYPE OF PROCESSOR INSTALL ED IN THE SYSTEM J29 J28

80486 SX QFP On 1 and 2 On 1 and 2
80486 SX PGA On 2 and 3 On 1 and 2
80486 DX PGA On 1 and 2 On 2 and 3
80486 SX QFP + 80487 SX PG A copr oce ssor On 1 and 2 On 1 and 2
80486 SX QFP + 80486 DX2 PG A O ver Drive On 1 and 2 On 1 and 2
80486 SX QFP + P24T PG A On 1 and 2 On 1 and 2
80487 SX PGA On 1 and 2 On 1 and 2
80486 DX2 PGA OverDrive On 1 and 2 On 2 and 3
P24T PGA On 1 and 2 On 2 and 3

* Default settin g.

2-50 M4-4x / M4-6x / PCS4xx

INTERRUPT LEVELS

LEVEL NAME CONTROLLER FUNCTION

1 IRQ0 1 Channel 0 timer OUT
2 IRQ1 1 Keyboard
da 3 a 10 * IRQ2 1 Interrupt issued to contr o ller 1 from con troller 2
3 IRQ8 2 Real time clock
4IRQ92 Free
5 IRQ10 2 Free
6 IRQ11 2 Free
7 IRQ12 2 Mouse
8 IRQ13 2 Co processor
9 IRQ14 2 Har d disk co nt roller
10 IRQ15 2 Free
11 IRQ3 1 Serial port 2
12 IRQ4 1 Serial port 1
13 IRQ5 1 Parallel port 2 - Parallel port 3
14 IRQ6 1 Floppy disk controller
15 IRQ7 1 Parallel port 1

* The priority level depends on the select ed inter ru pt. Fo r examp le, if inter ru pt IRQ11 is select ed th e
priority level is 6, while if interrupt IRQ15 is selected t he priorit y level is 10.

2

DMA CHANNELS

CHANNEL NUMBER OF BITS FUNCTION

0
1
2
3
4
5
6
7

8
8
8
8
16
16
16
16

Reserved
Free
Floppy disk transfers
Video
Used for the cascade conne ctio n of DMA1
Free
Free
Free

M4-4x / M4-6x / PCS4xx 2-51

I/O ADDRESS MAP

ADDRESS FUNCTION ADDRESS FUNCTION

000-01F h DMA controller 1, 8237A-5 300-31F h Reserved
020-03F h Interrupt controller 1, 8259A 360-36F h Reserved
040-05F h Timer, 8254 3 78- 37F h Parallel port 1 (LPT1)
060-06F h 8742 data keyboard cont roller 380- 38F h Reserved for SDLC

communicat ions, Bisync 2
61 h Sy stem Cont rol Por t B 3A0-3AF h Reserved for bisync 1
64 h 8742 co mma n ds key boar d

contro ller

070-07F h Real time clock, NMI Mask,

CMOS RAM (write re gist ers )
080-09F h DMA page registers 3D0-3DF h Video contro ller
0A0-0BF h Interrupt cpntroller 2, 8259 3E8-3EF h Serial port 3 (COM3)
0F0 h Cancels NPX (80487) busy 3F0-3F7 h Floppy disk contro ller
0F1 h Reset NPX, 80487 3F8-3FF h Serial por t (COM1 )
0F8-0FF 80487 math coprocess or 533 h Audio subsystem mute cont rol

1F0-1F8 h Hard disk contro ller 534-537 h Audio subsystem (in alternat ive

200-207 h Re ser ved 607 h Audio subsystem mute contro l

278-27F h Parallel port 2 (LPT 2) 608-60B h Audio subsystem (in

2F8-2FF h Se rial por t 2 (COM2 )

3B0-3BF h Reserved

3C0-3CF h Re ser ved

(in alternative to 607 h)

to 608-60B h)

(in alternative to 533 h)

alternative t o 534 -53 7 h)

2-52 M4-4x / M4-6x / PCS4xx

SYSTEM MEMORY MAP

000 KB

512 KB

640 KB

768 KB

800 KB

960 KB

1024 KB

USER DATA AREA

BUS BOARDS WITH
ON-BOARD MEMORY

VIDEO RAM

VIDEO BIOS SHADOW

FREE

SYSTEM BIOS SHADOW

00000 h

2

80000 h

A0000 h

C0000 h

C8000 h

F0000 h

100000 h

SYSTEM MEMORY

■

M4-4x / M4-6x / PCS4xx 2-53