EQUITY 486DX2/50 PLUS EQUITY 486SX/25 PLUS

VGA

 

 

Connector Pin

Assignments

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Phi

 

 

Slgnal

Pin

 

 

SIgnsI

 

1

 

 

Red Video

4

 

 

Key

 

2

 

 

Green Vrdeo

10

 

 

sync Return

 

I

 

 

! 3

 

 

1Blue Vrdeo

11

1

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

‘4

/

Unused

ii2

 

 

Reserved

 

5

/

Ground

 

113

 

1Honzontal

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

t4 (CTRL 2)

 

Cascade for CTRL 1

I

Soare

5 (CTRL 2)

,6(CTRL2;

 

Spare1

j 7 (CTRL 2)

1

Spare

Hardware Interrupts

I/O Port Addresses (continued)

:*ddress

 

 

Aeslgnsd device

 

 

 

 

1OF1

 

: Reset math coprocessor

 

 

 

1OF8 - OFF

 

Math coorocessor

 

 

 

 

 

 

 

 

 

 

 

 

i 170- 176

 

 

1Hard dtsk controller secondary

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

160-185

i Contlguratlon

regtsters

 

 

 

 

 

1BF’

/ Conlrguratron

register unlock port 1

 

 

 

lFO-ln

I Hard disk controller pnmary

 

 

 

 

200 - 207

1 Game I/O

 

 

 

 

 

 

 

278 - 27F

~Printer port 2 (278 and 27F are unused)

 

 

 

 

1278

 

i Confrguratron

regtster

unlock port

 

 

 

 

2F6 - 2FF

1 Serial port 2

 

 

 

 

 

 

,300.31F

 

 

Prototype card

 

 

/

 

 

370 - 377

 

 

Floppy drsk dnve controller

secondary

I

 

 

378 - 37F

 

 

Parallel printer port 1 (378

and 37F are unused)

 

 

 

 

 

 

 

3 7 0

i ConfIguratIon

register

unlock porl2

 

 

 

 

 

 

 

360-38F

 

1SDLC. btsvnchronous

wmmumcatron 2

1

 

 

 

 

 

 

 

3A0 - 3AF

1 Blsynchronous

wmmumcatron 1

 

 

 

 

 

 

I

 

 

 

380 - 3BF

 

 

1Monochrome dtsplay and pnnter adapter

 

 

 

 

3D0 - 3DF

1 Color/graphtcs

monltor adapter

 

 

 

 

3F0 - 3R

/ 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.

CTRLl

m/ Functlan

 

 

memory board

IRQO

 

i Timer Output 0

 

 

 

 

 

 

 

 

 

 

 

IRQl

 

/ Keyboard

 

 

 

 

 

IRCX?

 

! Interrupt from Controller 2

 

 

 

 

 

IRQ3

 

senal port 2

 

 

 

 

 

IRQ4

 

Send port 1

 

 

 

 

 

1 IRQS

 

Parallel port 2

 

 

 

 

 

 

 

 

 

 

 

 

 

IRC6

 

Floppy drsk interrupt

 

 

 

 

 

IRQ7

 

Parallel potl 1

 

 

 

JP7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IRQB

RTC Interrupt

 

 

 

 

 

 

 

 

JP8

 

 

IR09

Software redrrected to IRQ2

 

 

 

 

 

 

 

 

JP9

 

 

IRQlO

1 Reserved

 

 

 

 

 

 

 

 

JPlO

 

 

IRQll

j Reserved

* 25 MHz system only

.

JPll

 

 

IRQ12

Mouse, pomtmg dewce

 

JP12

 

 

IRQ13

Coprocessor

 

 

 

JP13

 

 

IRQ14

Hard dusk wntroller

 

 

 

JP14

 

/ IRQ15

1 Reserved

 

 

 

JP15

 

 

 

 

 

 

 

 

 

Miscellaneous jumper settings

l/O Port Addresses

 

1Addmo

/ Aulgned devh

 

 

 

 

1OW-OlF

 

DMA controller 1

 

 

 

 

- -

-.-..-

/

 

020 - 021

 

Interrupt

controller 1

 

 

40 - 05F

/

Trmerlwunter

 

 

 

 

 

 

1060-06F

 

1Kevboard controller 180421

 

 

 

 

 

 

1 070 - 0%

 

RTC. NMI mask regrster

 

 

060-OQF

 

DMA page registers, MFG port

 

OAO - OBF

 

Interrupt controller 2 (625QA

wmpabble)

 

OCO - ODF

 

DMA controller 2 (6237A-5

compabble)

 

OF0

 

Clear math coprocessor busy

 

 

 

 

 

 

 

 

Jumper

 

Jumper

Functlon

 

 

number

!

ssttlng

 

 

JP4

~ ;

Enables the burii-m VGA display adapter

 

 

 

Disables the burlt-in VGA display adapter so you

 

 

 

1

 

 

can use a dtsplay adapter on an optron card as

1

 

/

 

 

your primary adapter

I

JP5

 

 

 

 

Enables the power-on password

 

 

 

 

 

 

 

it

Drsables the power-on password

 

 

JP6

 

 

 

A’

Color monitor IS mstalled

 

 

 

 

 

 

0

Monochrome monitor IS mstalled

 

 

JP7

 

 

 

A’

Enables the buril-m mouse wnnector

 

 

 

 

 

 

0

Disables the built-m mouse connector so you can

 

 

 

 

I

 

 

 

 

 

I

 

use a mouse or other pointing devrce connected to )

 

 

 

 

 

a port on an option card

I

JP15

 

j

A

Enable the early input/output ready signal

 

 

 

BSets a normal mput/output ready slgnal

’ Factory settmg

Equity Series Computers

5/12/92

486DX2/50 & 486SX/25 PLUS-3