MHz speed is internal only; 8 MHz
speed is simulated by inserting wait states;
high/low speed selection through software
or keyboard
memory access at high speed
4MB RAM standard soldered onto memory
board; base memory of
640KB selectable through jumpers.
Memory expandable using 256KB or
IMB SIMMS, up to 16MB (maximum);
SIMMs must be fast-page mode, 80ns access
speed (or faster)
128KB
BIOS)
0 wait state
copies both ROM BIOS and video ROM
intoRAM
Standard for 50 MHz model; on 25 MHz
model,
replaced with optional
82385
32KB high-speed
way set associative.
Real-time clock, calendar, and
50-byte
battery backup
comman
(includes system BIOS and VGA
acceSS
80486SX
(25MHz)
CMOS RAM for configuration;
804865X
80486DX2/50
microprocessor can be
standard
processor,
processor
d; 0 wait state
256KB, 512KB
speed; automatically
80487SX
chip
(251-u)
static RAM;
two-
or
EQUITY 486DX2/50 PLUS
EQUITY 486SX/25 PLUS
Controllers
Diskette
Hard disk
Interfaces
Monitor
Serial
Parallel
Mouse port
Keyboard
Option slots
Power Supply
Type
Input ranges
Maximum outputs
Mass Storage Bays
Internal drive bay
Externally-accessible One third-height and two half-height drives
drive bay
Supports up to two drives in any of four
formats: 5%inch, highdensity,
5%inch,
3%inch,
31h-inch,
supports optional Epson tape drive;
controller on main system board
Supports up to two half-height drives;
embedded IDE controller; interface on main
system board
VGA adapter with
memory) built into main system board;
supports up to 800 x 600 or 1024 x 768
pixels in
in
required for resolutions over 640 X 480
15-pin, D-shell connector
RS232C,
9-pin, D-shell connector
Standard &bit parallel, mono-directional;
25-pin, D-shell connector
Mini DIN,
compatible mouse or other device
Mini DIN,
compatible keyboard
Six standard input/output expansion slots
(five
ISA compatible); 8 MHz bus speed
Internal; operation controllable by the Setup
program
2OOW,
input voltage sensing
98 to 132 VAC and 195 to 264 VAC
+5
-12 VDC at
so
Up to five drives maximum
Two half-height or one full-height drives
or one third-height and one full-height
drives
double-density, 360KB;
highdensity, 144MB; or
double-density, 720KB; also
1MB
&colors
256-colors;
programmable, asynchronous;
16&t
fan-cooled, automatic (worldwide)
VDC at 22 Amps,
6.8 Amps
Amps
or up to 640 x
multi-frequency monitor
6-pin
connector for
6-pin
connector for
ISA compatible and one &bit
+12
.50
Amps, -5 VDC at
1.2MB;
DRAM (video
480
pixels
PS/2
F’S/2
VDC at
Equity Series Computers
5/12/92
486DX2/50 & 486SX/25 PLUS-l
EQUITY 486DX2/50 PLUS
EQUITY 486SX/25 PLUS
Keyboard
Detachable, two position,
dependent) sculpted keys
Layout
58-key QWERTY main keyboard;
17-key numeric/cursor
Function
additional
keys
Four levels (normal, shift, control,
Pkey
cursor pad; 16 function
(user-definable)
alternate); user-definable
Environmental Requirements
Altitude
Maximum
wet bulb
-330 to
9900
(-100 to 3000 m)
6FP
(200 C)
It
F
-330to11660tt
(-100 to 3600 m)(-100 to 12000 m)
104O
F134°F
(400 Cl
Physical Characteristics
Width
Depth
Height
Weight
(without
keyboard)
17 inches (432 mm)
16
inches
MO6
mm)
6
inches (153 mm)
Single diskette drive model:
26
lb (11.8 kg)
Connector Pin Assignments
Parallel
Parallel Port
Port Connector
Pin 13
g-1
Pin 25
Connector
Pin
Assignments
(CN5)
101/102 (country-
pad;
10 cuxsor keys;
-330 to 39600
(5P
C)
Pin 1
Pin 14
Serial Port Connector
(CN4)
Serial Port Connector Pin Assignments
~
n
Keyboard and Mouse Connector
Pin 6.
(CNZ
,Pin 5
and
CNl)
w
&
Pin
44
PinI*Pinl
Although the keyboard and mouse connectors are physically
identical, they cannot be used interchangeably.
Keybwd Connecbr
Pin
1
signal
1
12
1 Kevboard
1 ReseNed
3
4
5
6
Ground
+5
Keyboard Clock
Reserved
Pin Assignmenfs
Data
VDC
Mouse Connector Pin Assignments
Pin
1
signal
1
1
12
16
Mouse Data
1
Reserved
3
4
5
Ground
+BVDC
(fused)
Mouse Clock
1 ReseNed
Pin 3
I
1
I
I
7
6
.9
‘Ache
DATA5
DATA6
DATA7
Low Logic
16
17
16
INITSEECTIK
SIGNAL GND
486DX2/50 & 486SX/25 PLUS-2
25SIGNAL
GND
VGA Connector (CN3)
5/12/92
Equity Series Computers
EQUITY 486DX2/50 PLUS
EQUITY 486SX/25 PLUS
VGA Connector
Phi
Slgnal
1
Red
2IGreen
31Blue
/
Unused
‘4
5/Ground
Red Return
3
7
Green Return
6
Blue Return
Video
Vrdeo
Vrdeo
Pin
Assignments
DMA Channels
I
Channel
,O(CTRLl)
1 (CTRL
:P(CTRLl)
~
3 (CTRL 1)
4 (CTRL 2)
t
5 (CTRL 2)
,6(CTRL2;
j
7 (CTRL 2)
1)
Function
Spare
SDLC
Floppy
Spare
Cascade for CTRL 1
I Soare
1
Spare
1
Spare
drsk
dnve controller
Pin
SIgnsI
4
Key
10!sync Return
111 1Reserved
ii2
Reserved
1131Honzontal
14
Vertcal Sync
15’unused
sync
I/O Port
:*ddress
1
OF1
1 OF8 -
I
i
170- 176
160-185
1BF’
lFO-ln
200 - 207
278 - 27F
1278
2F6-2FF
,300.31F
370-377
!
378 - 37F
370
360-38F
3A0 - 3AF
380-3BF
3D0-3DF
3F0 -
/ 3F8 *
These I/O address ports are wnllguratlon
Addresses (continued)
Aeslgnsd
:
Reset math coprocessor
OFF
3R
3FF
Math
1
Hard
i Contlguratlon regtsters
/ Conlrguratron
I Hard
1
Game
~
Printer port 2 (278 and 27F are unused)
i Confrguratron regtster
1
Serial port 2
Prototype card
Floppy
Parallel printer
i ConfIguratIon register
1 SDLC.
1 Blsynchronous wmmumcatron
1
Monochrome dtsplay and pnnter
1
Color/graphtcs monltor
/
Floppy
1 Senal
Jumper Settings
device
coorocessor
dtsk
controller secondary
register unlock port 1
disk
controller pnmary
I/O
unlock
port
drsk
dnve
port
btsvnchronous wmmumcatron
disk
drive wntroller pnmary
port 1
secondary
controller
1 (378 and 37F are unused)
unlock porl2
1
adapter
registers.
2
adapter
/
I
1
I
Hardware Interrupts
/
ICTRLl
m
IRQO
IRQl
IRCX?
IRQ3
IRQ4
1 IRQS
IRC6
IRQ7
IRQB
IR09
IRQlO
IRQll
IRQ12
IRQ13
IRQ14
/ IRQ15
Functlan
i
Timer
/
Keyboard
! Interrupt from Controller 2
senal port 2
Send
Parallel
Floppy
Parallel
RTC
Software
1
Reserved
j
Reserved
Mouse,
Coprocessor
Hard
1
Reserved
l/O Port Addresses
1
Addmo
1OW-OlF
020- 021
40 -05F
I
1060-06F
1
070 -
0%
060-OQF
OAO - OBF
OCO - ODF
I OF0
/
Aulgned
1 DMA
I
Interrupt controller
/
Trmerlwunter
1
Kevboard
RTC.
DMA page
Interrupt controller 2
DMA controller 2 (6237A-5
Clear math coprocessor busy
devh
controller 1
-.-..-
--
controller
NMI
mask
registers,
Output 0
port 1
port
drsk
potl 1
Interrupt
redrrected
pomtmg
dusk
wntroller
1
180421
regrster
MFG port
(625QA
2
interrupt
dewce
wmpabble)
compabble)
to
IRQ2
The illustration
main system board.
*
25 MHz system only
below shows the locations of the jumpers on the
Miscellaneous jumper settings
Jumper
number
JP4
JP5
/
JP6
JP7
JP15
’
Factory
settmg
Jumper
! ssttlng
~
;
1
/
it
A’
0
A’
I
0
I
j
A
B
memory board
.
Functlon
Enables the
Disables
can use a
your primary adapter
Enables the power-on password
Drsables
Color
Monochrome
Enables the
Disables
use a mouse or other pointing
a
port
Enable
Sets a normal
burii-m
the
the power-on password
monitor
the built-m mouse connector so you can
on an option card
the early input/output ready signal
VGA display adapter
burlt-in
VGA display adapter so you
dtsplay
adapter on an
IS
mstalled
monitor IS mstalled
buril-m
mouse
wnnector
mput/output
ready
optron
devrce
JP7
JP8
JP9
JPlO
JPll
JP12
JP13
JP14
JP15
card as
connected to
slgnal
1
I
)
I
Equity Series Computers
5/12/92
486DX2/50 & 486SX/25 PLUS-3
EQUITY 486DX2/50 PLUS
EQUITY 486SX/25 PLUS
Jumper settings for base memory
Base
memory
640KB
512KB
,256KB
*
Factory
setting
Jumper JP13
A
,B
!B
Jumper JP14
~ A’
IA
lB
Jumper settings for extended memory
T&d
memory
~ 4MB
i 6MB
1
QMB
I 10MB
12MB
16MB
*
Factory
setting
1
Jumper
! JPB
B
B
A
A
A
A
!B
!A
]B
IA
$v
0
B
JumperJumper
JPlO
B
;B
IB
0
A
A
Jumper settings for alternate microprocessor
‘Jumper
number
JPl
JP2
1
JP3
I
*
Factory
’
Jumper
eelllng
IA
B
ii*
iA
0’
settrig,
these lumpers are
Functlon
80487SX wwalled
80486SX wWalled
80467SX mslalled; NMI slgnal
80486SX
installed
1 60467SX mstallsd
j 60466SX mstalled;
not used for 60 MHz
JPll
0
A
A
A
A
A
NMI slgnal
FERR
stgnal
FERR
stgnal
mtcroprocessor
i
Jumper
JP12
A
A
A
,
IA
(A
jA
SIMM configurations
Bank1 Bank2
AMMM
IMMMM
/
II4
(MMMM
/MMMM
K=266KB
M=l MB SIMM
!
1
iKKKK
MM MKKKK
MMMM ~
MMMM
SIMM mtalled
mstalled
Bank 3
‘KKKK
lMMMb.4
,6MB
QMB
’
I 10MB
!
12MB
I16MB
Total memory
Hard Disk Drive Types
The following table lists the types of hard disk drives you can use
in the computer. Check this table and the documentation supplied
with your hard disk to find the correct number for the type of hard
disk drive(s) installed in your computer. You need to enter this
number
Setup program.
Hard disk drive types
I1
I
/
14
when you set the
I
Tnmno. CvhJrr
26154
36156
llrdr
306
1840 18 117
hard disk drive configuration in the
I
lrtors I Pmmm
I
f&c)
17128
4
1730061520Seagate
17I300
I
lJndhP
(Wkobi) 1 mnm - (inHI) mmufrtwa
I305
1615
1512
IS40 Ifi? 1
I
sa
I Drirrnmnl
10
Watcm Dqnal WD-93042
30Saapabz
ST225 and ST4026.
ST1 38A *
I
SIMM lnstallation
The SIMM sockets are labelled as shown below.
There are 12 SIMM sockets on the memory card organized in three
banks consisting of four sockets each. Each socket can contain one
memory module. You must fill all of the sockets in any bank you
use. Since each bank has four sockets, you must install four SIMMs
to fill up the bank
The following table shows all the possible SIMM configurations
for your computer. Do not install SIMMs in any other
configuration Remember that the memory card already contains
4MB (soldered).
28 j¶6
15 I17 1488
877
140
I
486DX/50 & 486SX/25 PLUS-4
5/12/92
Equity Series Computers
EQUITY 486DX2/50 PLUS
EQUITY 486SX/25 PLUS
Hard disk drive types (continued)
Tvpono Cylindm Hmk (tic)
36
37
a3
I38
548
I
39
761
40
9801 IO
I
I
411022
142I1022
,b3
1024
44
828IO34
45
1024
46
615
47
--
* Supwld In
translate
**
W~hWs~ernDgmlESOlcantlkr
Sadorr Rcomp Landing stm
116
134
18138
18
39
17
i5
34
18 ,I
1'
5
17
8
17
-
mode
WRom) me
! mn
1682
Imn/ 547
rme'
I760
~~
I nori+~1022
I
Mne
1022
512'~
Ioni
now
1828
512
11023142 1
128j61840
-
j-
Drnanarnd
(al MB) mmulactuar
-nserved-
~
202
Conner cP3204F
81 ~canMrcP2048
I 115 !
CannrCP30104
I
Malor7OmA
1,ToshbaMK-2024FC
I84 1
CDG942lblO6"
, 89(CDG942lblffi
~ M~~p0l1~1325.At~l3085,
Lm%rLANEd.MaxtorXT1O85. (
M
,&bu,.,,,DR,,)8.j
~
137
TorhbaMK-156F
/
-' 1
user dellred lype
i
lnstallation / Support Tips
Power
This computer has an automatic input voltage sensing power
supply (between
use in other countries). There is no manual switch
115V,
for USA and Canadian use, and
23OV,
for
Setup
-
When installing a hard disk drive, be sure to consult the
drive type table for the drive type parameters (geometry)
which fit the drive you are installing. You can also select a
type with parameters having lesser values, as long as they
do not exceed the maximum capacity (in MB) of your drive.
If
there is no match for your drive, enter the exect
parameters using the User
Defined
option.
Software Problems
-
When installing a copy-protected software package, first try
the installation at high speed. If this does not work properly,
try switching to low speed for the installation If you are still
unable to load the program at high speed, try loading at low
speed and then switching to high speed.
For the Equity
For the Equity
486DX2/50
48&3X/25
PLUS, high speed is 25 MHz.
PLUS, high speed is 50 MHz.
Both systems simulate 8 MHz at low speed.
-
When using a software package that uses a key disk as its
copy-protection method, try loading it at high speed. If this
does not work, enable Auto Speed in Setup on the Reference
diskette.
Power-on Password
-
Make sure that you do not forget the Power-on password
you set up. If you do, it wilI be necessary to disable it by
moving jumper JP5 on the main circuit board to position B.
Mouse and Keyboard
-
When connecting the mouse and keyboard, be careful to
plug them into the proper ports. Although they are
physically identical, they are not interchangeable, and
damage may occur to the ports or the
main
board.
Installing Floppy Disk Drives
-
When installing a floppy disk drive as drive B, remember to
set the drive select jumper to the second position and attach
the pass-through connector on the floppy drive controller
cable to the drive, not to the end connector.
-
If the drive does not function normally, make sure that the
drive type has been correctly selected in Setup. Also check
that any necessary drivers have been installed correctly.
-
If you have installed two floppy disk drives, remember that
the computer will boot from drive B when a disk is inserted
indriveBandnodi.skisinsertedindriveA.
Installing Hard Disk Drives
-
It is recommended that a
controller be used if you are installing a drive that cannot
use the embedded IDE interface. lnstalling a 16-bit interface
wilI
override the embedded IDE port and disable it,
the standard base l/O
l&bit,
address
AT-type hard disk
and
lRQ(s).
freeimg
Information Reference List
Engineering Change Notices
None.
Technical Information Bulletins
None.
Product Support Bulletins
None.
Related Documentation
Equity
TM-48625/50
PL-486DX2/50
PL-486%25+
SPK486DX2/50
Y73899110100
486DX2/50
Equity
Equity
486DX2/50
Equity
48fiSX/25
Equity
486DX2/50
Equity
486DX2/50
4&3X/25
486SX/25
PLUS User’s Guide
PLUS &
PLUS Service Manual
PLUS Parts Price List
PLUS Parts Price List
Self Paced Kit
PLUS
Equity Series Computers
5/12/92
466DX2/50 & 486SX/25 PLUS-5
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