IBM XT 5160 Manual de uso y cuidado

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Technical

Reference

Personal Computer

Hardware Reference

Library

Revised Edition (March 1986)

The following paragraph does not apply to the United Kingdom

any country

where such provisions are inconsistent with local

law:

INTERNATIONAL

BUSINESS

MACHINES

CORPORATION

PROVIDES THIS PUBLICATION

"AS

IS"

WITHOUT

WARRANTY

ANY KIND,

EITHER

EXPRESS

IMPLIED,

INCLUDING,

BUT

NOT

LIMITED

TO,

THE

IMPLIED

WARRANTIES

MERCHANT

ABILITY

FITNESS

FOR

PARTICULAR

PURPOSE. Some states do not allow disclaimer

express

implied warranties in certain transactions, therefore, this statement may not

apply to you.

This publication could include technical inaccuracies

typographical errors.

Changes are periodically made to the information herein; these changes will be

incorporated in new editions

the publication. IBM may make improvements

and/

changes in the product(s)

and/or

the program(s) described in this

publication

any time.

possible that this publication may contain reference to,

information

about, IBM products (machines and programs), programming,

services that

are not announced in your country. Such references

information must not be

construed to mean

that

IBM intends to announce such IBM products,

programming,

services in your country.

Products are not stocked

the address below. Requests for copies

this

publication and for technical information about IBM Personal Computer

products should

made

your authorized IBM Personal Computer dealer,

IBM Product Center,

your IBM Marketing Representative.

The following paragraph applies only to the United States and Puerto Rico: A

Reader's Comment

Form

provided

the back

this publication. If the form

has

been

removed, address comments to: IBM Corporation, Personal

Computer, P.O. Box 1328-C, Boca Raton, Florida 33429-1328. IBM may use

distribute any

the information you supply in any way it believes

appropriate without incurring any obligations whatever.

C£?

Federal Communications Commission

Radio FrequencyInterference

Statement

Warning: The equipment described herein has

been

certified

comply with the limits for aClass Bcomputing device, pursuant

to Subpart J

Part

of the

FCC

rules. Only peripherals

(computer

input/output

devices, terminals, printers, etc.) certified

comply with the Class Blimits may be attached

the

computer. Operation with non-certified peripherals

likely

result in interference to radio and

reception. If peripherals

not

offered

IBM are used with the equipment, it

suggested

use shielded grounded cables with in-line filters if necessary.

CAUTION

This product described herein

equipped with agrounded plug for

the user's safety.

to be used in conjunction with aproperly

grounded receptacle to avoid electrical shock.

iii

Notes:

Preface

This publication describes the various components of the IBM

Personal Computer XT and IBM Portable Personal Computer;

and the interaction of each.

The information in this publication

for reference, and

intended for hardware and program designers, programmers,

engineers, and anyone else with aknowledge of electronics

and/

programming who needs to understand the design

and

operation of the IBM Personal Computer XT or IBM Portable

Personal Computer.

This publication consists of two parts: asystem manual and an

options and adapters manual.

.The system manual

divided into the following sections:

Section 1, "System Board", discusses the component layout,

circuitry, and function of the system board.

Section 2, "Coprocessor", describes the Intel 8087

coprocessor and provides programming and hardware

interface information.

Section 3,

"Power

Supply", provides electrical

input/output

specifications as well as theory of operation for

both

the IBM

Personal Computer

power supply and the IBM Portable

Personal Computer power supply.

Section 4, "Keyboard", discusses the hardware makeup,

function, and layouts

the IBM Personal Computer

83-keyand lOl/102-key keyboards and the IBM Portable

Personal Computer keyboard.

addition, keyboardencod-

ing and usage

discussed.

Section 5, "System Bios", describes the basic

input/output

system

and

its use. This section also contains the software

interrupt listing, aBIOS memory

map,

descriptions

vec-

tors with special meanings,

and

aset

low memory maps.

Section 6, "Instruction Set", provides aquick reference for

the 8088 and 8087 assembly instruction set.

Section 7, "Characters, Keystrokes, and Colors", supplies the

decimal

and

hexadecimal values for characters

and

text

attributes.

Aglossary, bibliography,

and

index are also provided.

The Technical Reference Options and Adapters manual provides

information, logic diagrams, and specifications pertaining to the

options

and

adapters available for the IBM Personal Computer

family

products. The manual

modular in format, with each

module providing information about aspecific option

adapter.

Modules having alarge amount of text contain individual indexes.

The modules are grouped by type

device into the following

categories:

•Expansion Unit

•Displays

•Printers

•Storage Devices

•Memory Expansion

•Adapters

•Miscellaneous

•Cables

and

Connectors.

Full-length

hard-tab

pages with the above category descriptions,

separate the groups of modules;

The term "Technical Reference manual" in the Options and

Adapters manual, refers to the:

•IBM Personal Computer

/IBM

Portable Personal

Computer Technical Reference manual

•IBM Personal Computer Technical Reference manual

•IBM Personal Computer

Technical Reference manual.

The term "Guide

Operations manual" in the Options

and

Adapters manual, refers to the:

•IBM Personal Computer Guide to Operations manual

•IBM Personal Computer

Guide

Operations manual

•IBM Portable Personal Computer Guide to Operations manual

•IBM Personal Computer

Guide

Operations manual.

Prerequisite Publications

•IBM Personal Computer

Guide to Operations

•IBM Portable Personal Computer Guide to Operations.

Suggested Reading

•

BASIC

for

the

IBM

Personal Computer

•Disk Operating System (DOS)

•Hardware Maintenance Service manual

•Hardware Maintenance Reference manual

•Macro Assembler for the

IBM

Personal Computer.

vii

Notes:

viii

Contents

SECTION 1. SYSTEM BOARD

1-1

Description 1-3

Microprocessor

1-4

Data

Flow

Diagrams 1-5

System Memory

Map

1-8

System Timers

1-10

System Interrupts 1-11

System Boards

1-12

RAM

1-12

ROM

1-13

DMA

1-14

I/O

Channel

1-15

System

Board

Diagram

1-19

I/O

Channel

Description

1-20

I/O

Address

Map

1-24

Other

Circuits

1-26

Speaker Circuit

1-26

8255A

I/O

Bit

Map

1-27

Specifications

1-29

System Unit

1-29

Card

Specifications 1-31

Connectors

1-32

Logic Diagrams -

64/256K

1-34

Logic Diagrams -

256/640K

1-46

SECTION 2.

COPROCESSOR

2-1

Description 2-3

Programming Interface

2-4

Hardware

Interface

2-4

SECTION 3.

POWER

SUPPLIES

3-1

IBM

Personal

Computer

Power Supply

3-3

Description

3-3

Input

Requirements

3-4

Outputs

3-4

Overvoltage/Overcurrent

Protection

3-5

Power

Good

Signal

3-5

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