AT&T PC 6300 - Page 44

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SYSTEM

OVERVIEW

•

Daisy

Wheel

Letter-Quality

Printer

•

Dot-Matrix

Printer.

Serial

Communication

Interface

2-20

0

n

Parallel

Printer

Interface

The

Parallel

Printer

Interface

provides

one

Centronics-like

parallel

P|

interface

for

the

connection

of

a

printer.

It

is

physically

located

on

the

Motherboard

and

access

is

made

through

the

rear

panel

of

^

the

System

Module.

A

printer

may

be

one

of

the

following:

n

p

The

PC

6300

has

a

standard

serial

channel

to

support

serial

communications.

The

LSI

serial

communication

chip

used

is

the

f

NEC

8250

(or

equivalent).

It

provides

one

asynchronous

RS-232

channel.

The

RS-232

connector

is

located

on

the

Motherboard

and

m

access

is

made

through

the

rear

panel

of

the

System

Module.

|

j

Input/Output

Chip

Select

Logic

The

I/O

Chip

Select

Logic

is

an

address

decoder

used

to

generate

chip

select

signals

from

address

bits

A4

to

A9.

This

circuitry

uses

^

the

PAL12L10

as

the

Motherboard

I/O

address

decoder.

!

I

n

n

n

n

n

n

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User Guide456 pages

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