IBM PC CONVERTIBLE Manual de uso y cuidado

First Edition (February 1986)

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©Copyright International Business Machines 1986

Preface

The IBM PCConvertible Technical Reference consists

two

volumes. Volume 1describes the hardware design

and

provides interface information for the IBM PCConvertible.

Volume 1also has information about the basic

input/output

system (BIOS)

and

programming support. Volume 2 contains

the BIOS listings.

The information in these volumes is both descriptive

and

reference-oriented

and

is intendedfor hardware

and

software

designers, programmers, engineers,

and

otherinterested

persons who need to understand the design

and

operation

the IBM PC Convertible. These users should be familiar with

the use

the IBM PCConvertible

and

understand the

concepts

computerarchitecture

and

programming.

Volume 1has five sections:

• Section

"Introduction"is

overview

the system

and

theavailable options.

• Section

"System

Unit"

describes each functional part

thebase system. This section also contains thedescription

the interfaces. Programmingconsiderationsare

supportedby

command

code

and

registerdescriptions.

• Section

"System Options" describes each available

option.

• Section

"System BIOS

and

Usage" describes thebasic

input/output

system (BIOS)

and

its use. This section also

containsthe software interruptlisting, a system memory

map, descriptions

vectors with special meanings,

and

set oflow-storage maps.

addition, Section 4 describes

keyboard encoding

and

usage.

• Section

"Compatibilitywith the IBM Personal

ComputerFamily" describes programmingconcerns for

maintainingcompatibilityamongthe IBM PC

Convertible system

and

the

other

IBM Personal

Computers.

iii

Volume 1has thefollowing appendixes:

• Appendix

"Characters

and

Keystrokes"

• Appendix

"Unit

Specifications"

• Appendix

"Logic Timing Diagrams"

• Appendix D, "Power-OnSelfTestErrorCodes".

Volume 2contains the BIOS listing

and

be used

conjunctionwith Volume

Prerequisite Publications

Guideto Operations: for the IBM PC Convertible.

Suggested

Reading

•

BASIC

for the IBM Personal Computer

• Disk OperatingSystem

• Hardware Maintenance

and

Servicefor the IBM PC

Convertible

•

MACRO

Assemblerfor the IBM Personal Computer.

Contents

Section 1. Power-On Self-Test

(POST)

...............

1-1

Power-On Self-Test Sequence

..................

1-2

Modem Presence Test

........................

1-9

Printer/CommunicationsPresence Test

.........

1-12

Section 2.

ROM

BIOS

Listing

......................

2-1

ROMMap

.................................

2-4

Common

Equates

and

Data

Areas

...............

2-7

Nonmaskable Interrupt Handler(BlONMIH)

....

2-26

Keyboard Services

(BIIKYBD)

...............

2-65

Video

I/O

and

Screen (BI2VIDEO)

........

2-77

Diskette Support

13DSKT)

................

2-119

Communications

and

PrinterBIOS

(B14COMMO)

...........................

2-143

Time

Day(B15TOD)

.....................

2-153

System Services

16SYSV) . . . . . . . . . . . . . . . . . . 2-168

General Subroutines

and

Tables

17TABLE)

...

2-191

Release Date Marker

.......................

2-241

System Model Byte

.........................

2-241

Notes:

Section 1. Power-On Self-Test

(POST)

The

IBM

Convertibleuses a set

routines called the

power-on self-test(POST) routines. These routines

automaticallyactivate system power, perform basic function

and

device controltestsfor the majorsystem components,

and

initializethesystem

theready state. Because the

operation

these routines is automatic

and

cannotbe

changed by anapplication programmer, theactual program

listingsare not included

this manual. However, it

may

useful to understandthefunction

these routines

and

the

initial values they

may

establish.

Figure

I-Ion

page

1-2

shows the sequence

thesteps the

power-on routines, theerrorindicatorsreturned,

and

the

initial values established. Figure

1-2

page

1-9

and

Figure

1-3

page 1-12 provide additional information

testingfor

thepresence

devices.

Power-OnSelf-Test

(POST)

1-1

Power-On Self-Test Sequence

Description ErrorIndication

Processortest: Verifies processor System power off.

operation.

System

ROM

checksum test: I-long

and

I-short

Verifies system ROM. beep, then system

power off.

Real-iimeclock

RAM

test: Verifies l-iong

and

I-short

the clock.

contents havebeen beep, then system

altered, RAM is cleared

and

poweroff.

system profile defaults are loaded.

Power source

and

batterycheck: 3-shortbeeps, then

Checks for external power.

no system poweroff.

external power, checks for good

battery.

Base

RAM

test: Validates first I-long

and

I-short

RAM

and

clears it to zero. beep, thensystem

poweroff.

Internal

modem

poweron: Checks

for internal

modem

presence

and

applies powerto itifpresent. See

Figure

1-2

page

1-9

for

additionalinformation.

Figure 1-1

(Part

1of7). Power-on Self-TestSequence

1-2 Power-OnSelf-Test

(POST)

Description

Error

Indication

Video adapterpresencetest:

Checks for attached video

adaptersby nondestructive writing

and

readinghex A55A to address

hex

BOOOO

and

B8000. Checks for

videoadapterswith valid rom.

Checks for

LCD

bydetermining

the

'LCD

sense' line is set.

Video interrupt vectors

initialization:Initializeshex

10,

ID, IF

and

44 video interrupt

vectors to system defaultvalues.

Video

ROM

validitytests: Checks

for videoadapterwith valid ROM.

See Volume I for additional

information

about

adapterswith

system accessible ROM. Links to

ROM

valid.

LCD

function test: Runs

LCD

Error 5001, 5002,

function

test

the LCDis present. 5003

CRT

adapter without

ROM

Error 0501

presenceandfunction tests:

Ifa

CRT

adapterwithout

ROM

present, test vertical

and

horizontal syncs.

Operabledisplaypresencetest: I-long

and

2-short

Checks to ensure

that

an operable beeps, then system

display is present. poweroff.

Figure1-1

(Part

7). Power-onSelf-TestSequence

Power-On Self-Test

(POST)

1-3

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