EQUITY 486DX2/50 PLUS
EQUITY 486SX/25 PLUS
VGA Connector
Pin
Assignments
1
Red
Key
2
Green
10
sync Return
3
Blue
11
Reserved
I/O Port
Addresses (continued)
‘ 4
Unused
Reserved
5
Ground
sync
Red Return
14
Sync
7
Green Return
15
unused
Blue Return
DMA Channels
Channel
Spare
1 (CTRL
SDLC
Floppy
controller
3 (CTRL 1)
Spare
4 (CTRL 2)
Cascade for CTRL 1
5 (CTRL 2)
Spare
7 (CTRL 2)
Spare
Hardware Interrupts
i
Output 0
Keyboard
! Interrupt from Controller 2
port 2
Parallel
2
Floppy
interrupt
Parallel
RTC
Software
to
Reserved
Reserved
Mouse,
Coprocessor
Hard
wntroller
Reserved
l/O Port Addresses
controller 1
- -
020 021
Interrupt controller
40
controller
070
OAO OBF
OCO ODF
RTC.
mask
DMA page
MFG port
Interrupt controller 2
DMA controller 2
Clear math coprocessor busy
OF1
OFF
device
Reset math coprocessor
Math
176
Hard
controller secondary
200 207
278 27F
register unlock port 1
I Hard
controller pnmary
Game
Printer port 2
and 27F are unused)
370 377
unlock
Serial port 2
Prototype card
Floppy
controller secondary
I
378 37F
3 7 0
Parallel printer
1
and 37F are unused)
unlock
SDLC.
2
3A0 3AF
1
3BF
3D0 3DF
3F0
Monochrome
and pnnter adapter
adapter
Floppy
wntroller pnmary
3FF
port 1
These I/O address ports are
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
JP12
JP13
JP14
JP15
Miscellaneous jumper settings
Jumper
J u m p e r
JP4
JP6
A’
JP7
JP15
A
B
Factory
Enables the
VGA display adapter
the
VGA display adapter so you
can use a
adapter on an
card as
your primary adapter
Enables the power-on password
the power-on password
Color
IS
Monochrome
Enables the
mouse
the built-m mouse connector so you can
use a mouse or other pointing
connected to
a
on an option card
the early input/output ready signal
I
Sets a normal
ready
Equity Series Computers
5/12/92
486DX2/50 & 486SX/25 PLUS-3
