Epson 486DX2 EN - Manual (Page 4)

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