AT&T 6300 Manuel

Written by

Agora Resource, Inc.

Lexington,

AT&T

Microsoft®

All

Rights Reserved

Printed

USA

NOTICE

The information

this document is subject to change without

notice.

AT&T

assumes no responsibility for any errors that may

appear in this document.

BASIC

Programmers

Guide

Contents

1Introduction

Introduction

1-2

Major Features

1-3

Syntax Conventions

1-4

Line Format

1-7

Character Set

1-9

Reserved Words

1-10

2Getting Started

Initialization Procedure

2-2

Modes

Operation

2-3

Keyboard

2-4

The GWBASIC Screen Editor

2-12

Using Your System as aCalculator

2-23

Entering aProgram

2-26

Listing aProgram

2-29

Saving aProgram

2-30

Loading aProgram

2-31

Executing aProgram

2-32

Program Interrupts

2-37

3Variable Types

Constants

3-2

Variables 3-7

Expressions

and

Operators

3-14

BASIC

Programmers

Guide

4Disk File Handling

Device

Independent

Input/Output

4-2

How MS-DOS Keeps

Track

of Your Files

4-3

File Specification

4-5

Commands for

Program

Files

4-18

Disk

Data

Files -Sequential

and

Random

Access

4-21

5Graphics

Selecting

the

Screen

Attributes

5-2

Text

Mode

5-4

Graphics Mode

5-7

6Asynchronous

Communications

Opening Communications Files

6-2

Communication I/O

6-3

Communication I/O

Functions

6-4

7Command References

Introduction

7-2

Commands,

Statements,

and

Functions

with

Examples

7-16

BASIC

Programmers

Guide

Appendices

Tables

Hexadecimal Conversion Tables

ASCII Codes

Extended Codes

Hexadecimal to Decimal Conversion Tables

Derived Functions

Advanced

Features

Memory

Allocation

Internal

Representation

Calling

Subroutines

Event

Trapping

Conversion

Programs

GWBASIC

Introduction

String

Dimensioning

MAT

Functions

Multiple

Assignments

Multiple

Statements

PEEKs

and

POKEs

...

THEN

...

[ELSE

...]

File I/O

Graphics

Sounding

the

Bell

Error

Codes

and

Error

Messages

Error

Messages

Error

Codes

Glossary

Index

Supplement:

Display

Enhancement

Board

A-3

A-4

A-8

A-lO

A-12

B-2

B-4

B-6

B-22

C-2

C-3

C-6

C-7

C-8

C-9

C-I0

C-ll

C-12

C-13

D-2

D-4

1Introduction

•

Introduction

•

Major

Features

•

Syntax

Conventions

•

Line

Format

•

Character

Set

•

Reserved

Words

1-1

Introduction

INTRODUCTION

dWBASIC

the

most

extensive

implementation of

BASIC

available for

personal computers.

meets

the

requirements

the

ANSI

standard

for BASIC, and

supports

many

features rarely found in

other

BASICs.

provides sophisticated

string

handling,

structured

programming features,

and

improved graphics.

GWBASIC gives you ease of use plus features

that

make your personal computer perform

its

best.

UNIX

is a

trademark

of AT&T Bell Laboratories.

Ms™·bOS

is a

trademark

of Microsoft Corporation.

Microsoft® is aregistered

trademark

of Microsoft Corporation.

1-2

Introduction

MAJOR FEATURES

Some of

the

special features of

GWBASIC

are:

•

UNIX™

style

MS™-DOS interface for auser-

friendly

operating

environment

•Re-directable

standard

input

and

output

•Device communication

commands

initialize

and

communicate

with

peripheral

devices

•

Tree-structured

disk

directories

•

Improved

Disk

I/O facilities for

large

files

•

Advanced

screen

editing

•

Enhanced

Graphics

commands

•User-defined Keyboard,

Error,

and

Event

Trapping

•Precise

error

reporting

with

ERDEV

and

ERDEV$

•

Optional

double precision

transcendentals

•Precise control of

memory

allocation

•

CALL

statements

with

parameter

passing

•Chaining

with

common variables

programs

larger

than

the

available

memory

•

Optional

declaration of variable

names

1-3

Introduction

{ }

[ ]

1-4

SYNTAX CONVENTIONS

•Uppercase

letters

and

words,

and

the

sym-

bols

listed

below, should be

typed

the

actual

line

exactly

as shown.

(),;:=!#$-><

the

statement:

WRITE #filenum, list-of-expressions

and

the

comma

(,)

after

filenum should be

typed

shown.

•Lowercase

letters

and

words

represent

variable

information

(or

parameters)

that

the

user

must

provide.

the

statement:

KILL filespec

filespec should be replaced

aspecific

value-for

example,

"MYFILE".

•

The

symbols

listed

below are

used

define

the

syntax

aline,

but

should

not

typed

the

actual

line:

vertical

stroke

indicates

alternatives

braces

indicate

achoice

brackets

indicate

options

ellipsis

indicates

repetition

underscore

joins

parts

names

amultiple-

word

parameter

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