Epson Equity LT Troubleshooting Guide download pdf (Page 3)

EQUITY LT

I/O Port Addresses

Address

Function

000-OlF

DMA Controller

020

-

03F

Interrupt Controller

040

-05F

Timer

/

Counter

080

-

07F

Programmable Peripheral Interface

080

-

09F

DMA Page Register

OAO

Non

-

Maskable Interrupt Mask

2F8-2FF

Serial Port 2

320

-

32F

Hard Disk Controller

3BC

-

3BF

Parallel Port

3D0

-

3DF

Video (LCD/CRT) Controller

3FO-3W

Floppy Disk Controller

3F8

-3FF Serial Port 1

03DA

Gradation Selection

1184-1185

RTC and CMOS RAM

1188

System Status Register

DMA Channels

Channel

Function

0

DRAM Refresh

1

Spare

2

FDD Controller

3

HDD Controller

Hardware Interrupts

NUMBER FUNCTION

IRQO

IRQl

IRQ2

IRQ3

IRQ4

IRQ5

IRQ8

IRQ7

Timer Output

Keyboard

Reserved

Serial Port 2

Serial Port 1

Hard Disk

Floppy Disk

Printer

Equity Series Computers

12/12/88

EQLT-3

1 2 3 4 5

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