EPSON Equity 4SX/25,4DX/33, and 4DX2/50

VGA Feature Connector (CN8)

pin 1

 

 

 

 

pin 25

 

 

‘Yeeaeeeeoeaaw

 

 

 

pin 2 ’

 

,feooooooooooo~,

 

 

’ pin 26

 

 

 

 

 

 

 

 

VGA Feature Connector Pin Assignments

 

 

 

 

 

 

 

8

IData

I17

1

ENDATA’

I26 1 Not connected

9

1

PCLK

118

1

ENSYNC’

 

 

 

 

 

 

 

*Active low logic

 

 

 

 

DMA Assignments

Level

Assigned device

DMAO

Spare @-bit)

DMAl

Spare (&bit)

DMA2

FDD controller (&bit)

DMA3

Spare (&bit)

DMAS

Spare (16~bit)

DMAG

Spare (16~bit)

DMA7

Spare (16~bit)

Hardware Interrupts

IRQ no.

Function

IRQO

Timer output

IRQl

Keyboard

iRQ3

Serial port 2

 

 

iRQ13 Math coprocessor

iRQ14 HDD controller

iRQ15 Avaiiabie

System I/O Address Map

 

 

 

 

 

Hex address

Assigned device

000-OlF

DMA controller 1,8237A-5

020-03F

interrupt controller 1, 8259A, master

040 - 05F

Timer, 8254-2

060-06F

8042 (Keyboard and mouse)

070 - 07F (CMOS)

Real-time clock NMI (non-maskable interrupt mask)

080-09F

DMA page register, 74LS612

OAO - OBF

interrupt controller 2, 8259A

OCO - ODF

DMA controller 2,8237A-5

OF0

Clear

math

coprocessor busy

OF1

Reset

math

coprocessor

OF8 - OFF

Math coprocessor

lFO- lF8

Hard

disk

 

 

200 - 207

Game IK)

 

 

278 - 27F

Parallel printer port 2

280 - 2DF

Alternate enhanced graphics adapter

2El

GPIB (adapter 0)

2E2 and 2E3

Data acquisition (adapter 0)

2F8 - 2FF

Serial port 2

 

 

300-31F

Prototype card

1348’357

DCA 3278

 

 

360-36F

PC network

 

 

378 - 37F

Parallel printer port 1

380-38F

SDLC, bisync 2

390-393

Cluster

 

 

3A0 - 3AF

Bisynchronous 1

3BO - 3BF

Monochrome display and printer adapter

X0-3CF

Enhanced graphics adapter

 

 

 

 

 

1 B90-893

1 EE2 - EE3

82El

A2El

C2El

E2El

4/1/93

EPSON Equity-5