Personal Com puter - Pocket Service G uide
M280
CHARACTERISTICS
Microprocessor 80286
Clock 12 MHz (8 MHz BUS)
RAM access t im e 100 ns
Wait st ates 1
ROM memory 32 KB
Minimum/maximum RAM
capacity
BOARDS
FUNCTION DESCRIPTION D.R.S. CODE CHARACTERISTICS
CPU System board
CPU System board
Console controller
Bus Adapter
Power supply
U-TURN board
RAM expansion
OEC monitor adap ter
PGC monitor adap ter
HD/FD controller
HD/FD controller
1 MB
BA817
BA824
CO113
IF622
LA21
IF623
ME903
GO451/GO467
GO423
GO714
GO723
411994 B
964908 F
497680 T
411077 N
497682 R
411993 A
411860 Y
411688 Y
411638 V
412141 L
W = 230
Maximum 2 MB
EGA comp at ib le
Monitor, posit ive
ST506/MFM
ST506/RLL
4
ROM BIOS/PAL/ EPROM LEVEL
FUNCTION POS. EVOLUTION
ROM
Bios
Wait logic
Bus logic
BIO select.
I/O logic
RAM decode
PIGGY BACK
KBC uP8742
Keyboard FW
COMP ATIBILIT Y NOTES
ROM BIOS 2.16:
(CD 255.60.1 /5 02)
ROM BIOS 2.1 6. 1 Solves problems of ope ra tion with Win dows/ S and with the PG 208M 2
HL6 K
4 K
5 D
6 T
1 A
3 M
1 F
5 T
6 X
8 V
-
PBVW 2.14
PBVV 2.14
PLY4
PBVU
PLY5
PBUA
PBUD
PBUC
PL99
CSP9
- Enlarges the HDU table and add s a 62 MB RLL hard disk
- Solves problems with 1.44 MB uFD
- Support s OEC 2 boar d in CGA mo d e
- Solves format B problem: (CDM 501 M280 )
- Manages cor rect ly har d disk even if it is not formatted with the sys tem
BIOS level
print er .
PBVS 2.16
PBVT 2.16
Rev. 2.16.1
M280 4-1
8259
INTERRUPT
CONTROLLE R
BRA3A
JU1
Personal Comp ut er - Pock et Se rv ice G uide
SYSTEM BOARD COMPONENTS AND SETTINGS
MC146818 8742
JU8
JU3
JU9
TIMER 8254- 2
EPROM
BOOTSTRAP
HIGH BYTE
27128 PBUG
BANK 0
6X
6T
BANK 1
5T
JU4
FE2000
EPROM
BOOTSTRAP
HIGH BYTE
27128 PBUG
UART 16450
JU6/JU7
JU5
JU6/JU7/JU8
JU11
COPROCES.
JU10
JU12
JU2
80286 CPU
JU1 1..........8
16........9
AREA 1-16 2-15 3-14 FUNCTION
RAM ON 512 KB
OFF* 1 MB
Customer Eprom ON OFF 27128
OFF* ON* 27256
AREA 4-13 5-12 6-11 7-10 8-9 FUNCTION
BIOS Eprom ON OFF 27128
OFF* ON* 27256
Parallel Port ON* Enabled
OFF Not Enabled
Serial Port ON Not Enabled
OFF* Enabled
- - OFF* Not used
4-2 M280
Personal Com puter - Pocket Service G uide
JU2
AREA 1234FUNCTION
Clock of
80287 copr oces sor
See:
OFF* OFF* OFF* OFF* 8 MHz
ON ON ON ON 12 MHz *
JU10/JU11 and JU12
AREA 5678FUNCTION
Video OFF* OFF* "Dual Port" PGC or OEC
ON ON "Flicker " mat rox
Syst em clock OFF* 24 MHz
ON External
80287 Wait state s OFF 10
ON* 3
JU3
AREA 1234FUNCTION
Burn-in OFF Disabled
ON Enabled
Monitor type OFF Monochr omatic
ON* Colour / Monochrom atic
32 MHz clock OFF Disconnected
ON* Connected
OFF * Reserved
4
JU4
AREA 1 FUNCTION
14 MHz clock OFF Disconnected
ON* Connected
JU6
AREA 1 FUNCTION
Syste m clo c k OFF 8 MHz
ON* 12 MHz
JU5
AREA 1 FUNCTION
1.8 MHz clock OFF Disconnected
ON* Connected
JU8
AREA 1 FUNCTION
MC146818 and non-volatile
RAM clock
OFF ON* MC146818 and RAM
(*) Defa ult positi o n
M280 4-3
Personal Comp ut er - Pock et Se rv ice G uide
JU7
AREA 1 FUNCTION
System clock OFF* 12 MHz
ON 8 MHz
JU10 JU11 JU12
AREA 1 F UNCTION
80287 coprocessor clock
(See: JU2)
JU9
AREA 1 F UNCTI ON
MC146818 clock OFF
Non-volat i le RAM ON* MC14681 8 and RAM
(*) Default position
I/O ADDRESS MAP
OFF* 8 MHz
ON 12 MHz
ADDRESS FUNCTION ADDRESS FUNCTION
000-01F
020-03F
040-05F
060-06F
070-07F
080-09F
0A0-0BF
0F0-0FF
1F0-1F8
200-207
278-27F
INTERRUPT LEVELS
LEVEL FUNCTION
IRQ0
IRQ1
IRQ2
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
IRQ8
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
DMA cont ro ller 1
Interrupt controller 1
Timer
Keyboard controller
RTC, CMOS, NM I mas k
DMA page regist er
Interrupt controller 2
80287
Hard disk controller
Reserved
Parallel port 2
Channel 0 tim er
Keyboard controller
Interrupt f ro m inter r upt controller 2
Serial port 2
Serial port 1
Parallel port 2
Floppy disk cont r ol ler
Parallel port 1
Date and Time
Redirect ed to IRQ 2
Available
Available
Available
80287
Hard disk controller
Available
2F8-2FF
300-31F
360-36F
378-37F
380-38F
3A0-3AF
3B0-3BF
3C0-3CF
3D0-3DF
3F0-3F7
3F8-3FF
DMA CHANNELS
CHANNEL FUNCTION
DMA0
DMA1
DMA2
DMA3
DMA4
DMA5
DMA6
DMA7
Serial port 2
Reserved
Reserved
Parallel port 1
Comm. SDLC 2
SDLC 1
Reserved
Reserved
Video controller
Floppy disk controller
Available
8 BIT
8 BIT
8 BIT
8 BIT
16 BIT
16 BIT
16 BIT
16 BIT
■
4-4 M280
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