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EQUITY 486DX2/50 PLUS
EQUITY 486SX/25 PLUS
VGA Connector
Pin
Assignments
Phi
Slgnal
Pin
SIgnsI
1
Red
Video
4
Key
2
I
Green
Vrdeo
10
!
sync Return
3
1
Blue
Vrdeo
11
1
1
Reserved
I
I/O Port
Addresses (continued)
‘4
/
Unused
ii2
Reserved
5
/
Ground
113
1
Honzontal
sync
3
Red Return
14
Vertcal Sync
7
Green Return
15
’
unused
6
Blue Return
DMA Channels
I
Channel
Function
,O(CTRLl)
Spare
1 (CTRL
1)
SDLC
:P(CTRLl)
Floppy
drsk
dnve controller
~
3 (CTRL 1)
Spare
4 (CTRL 2)
Cascade for CTRL 1
t
5 (CTRL 2)
I
Soare
,6(CTRL2;
1
Spare
j
7 (CTRL 2)
1
Spare
Hardware Interrupts
I
CTRLl
m
/
Functlan
IRQO
IRQl
IRCX?
IRQ3
IRQ4
1
IRQS
IRC6
IRQ7
IRQB
IR09
IRQlO
IRQll
IRQ12
IRQ13
IRQ14
i
Timer
Output 0
/
Keyboard
! Interrupt from Controller 2
senal port 2
Send
port
1
Parallel
port
2
Floppy
drsk
interrupt
Parallel
potl
1
RTC
Interrupt
Software
redrrected
to
IRQ2
1
Reserved
j
Reserved
Mouse,
pomtmg
dewce
Coprocessor
Hard
dusk
wntroller
/
IRQ15
1
Reserved
l/O Port Addresses
1
Addmo
/
Aulgned
devh
1 OW-OlF
1
DMA
controller 1
I
--
-.-..-
020
-
021
Interrupt controller
/
1
I
40
-
05F
/
Trmerlwunter
1060-06F
1
Kevboard
controller
180421
1
070
-
0%
060-OQF
OAO - OBF
OCO - ODF
I
OF0
RTC.
NMI
mask
regrster
DMA page
registers,
MFG port
Interrupt controller 2
(625QA
wmpabble)
DMA controller 2 (6237A-5
compabble)
Clear math coprocessor busy
:*ddress
1
OF1
1
OF8
-
OFF
Aeslgnsd
device
:
Reset math coprocessor
Math
coorocessor
i
170- 176
1
Hard
dtsk
controller secondary
160-185
1BF’
lFO-ln
200
-
207
278
-
27F
i
Contlguratlon
regtsters
/
Conlrguratron
register unlock port 1
I Hard
disk
controller pnmary
1
Game
I/O
~
Printer port 2 (278 and 27F are unused)
1278
2F6
-
2FF
,300.31F
370
-
377
i
Confrguratron
regtster
unlock
port
1
Serial port 2
Prototype card
/
Floppy
drsk
dnve
controller
secondary
I
!
378
-
37F
370
360-38F
Parallel printer
port
1 (378 and 37F are unused)
i
ConfIguratIon
register
unlock porl2
1 SDLC.
btsvnchronous
wmmumcatron
2
3A0
-
3AF
1
Blsynchronous
wmmumcatron
1
1
I
380
-
3BF
3D0
-
3DF
3F0
-
3R
1
Monochrome dtsplay and pnnter
adapter
1
Color/graphtcs
monltor
adapter
/
Floppy
disk
drive wntroller pnmary
/
3F8
-
3FF
1
Senal
port 1
*
These I/O address ports are wnllguratlon
registers.
Jumper Settings
The illustration
below shows the locations of the jumpers on the
main system board.
memory board
*
25 MHz system only
.
JP7
JP8
JP9
JPlO
JPll
JP12
JP13
JP14
JP15
Miscellaneous jumper settings
Jumper
Jumper
number
!
ssttlng
JP4
~
;
1
/
JP5
it
JP6
A’
0
JP7
A’
I
0
I
JP15
j
A
B
’
Factory
settmg
Functlon
Enables the
burii-m
VGA display adapter
Disables
the
burlt-in
VGA display adapter so you
can use a
dtsplay
adapter on an
optron
card as
1
your primary adapter
I
Enables the power-on password
Drsables
the power-on password
Color
monitor
IS
mstalled
Monochrome
monitor
IS
mstalled
Enables the
buril-m
mouse
wnnector
Disables
the built-m mouse connector so you can
use a mouse or other pointing
devrce
connected to
)
a
port
on an option card
Enable
the early input/output ready signal
I
Sets a normal
mput/output
ready
slgnal
Equity Series Computers
5/12/92
486DX2/50 & 486SX/25 PLUS-3