Atari 800 Basic Reference Manual

ABBREVIATIONS
USED IN THIS
MANUAL
4 General Information
Items in Brackets: Brackets, [ ], contain optional items which may be used ,
but are not required. If the item enclosed in brackets is followed by three dots
[exp, .. . ], it means that any number of expressions may be entered, but none are
required.
Items stacked vertically in braces: Items stacked vertically in braces indicate
that any one ofthe stacked items may be used, but that only one at a time is per-
missible. In the example below, type either the GOTO or the GOSUB.
{
GOTO}
100 GOSUB 2000
Command abbreviations in headings: If a command or statement has an ab-
breviation associated with it, the abbreviation is placed following the full name
of the command in the heading; e.g., LET (L.).
The following table explains the abbre v iations used throughout th is manual:
avar
svar
mvar
var
aop
lop
aexp
lexp
TABLE 1.1 ABBREVIATIONS
Arithmetic Variable: A location where a numeric value is
stored. Variable names may be from 1 to 120 alphanumeric
characters, but must start with an alphabetic character, and all
alpha characters must be unre v ersed and upper case.
String Variable: A location where a string of characters may be
stored. The same name rules as avar apply, except that the last
character in the variable name must be a$ . String variables may
be subscripted. See Section 7, STRINGS.
Matrix Variable: Also called a Subscripted Variable. An ele-
ment of an array or matrix. The variable name for the array or
matrix as a whole may be any legal v ariable name such as A, X,
Y, ZIP, or K. The subscripted variable (name for the particular
element) starts with the matrix v ariable, and then use s a number,
variable, or expression in parentheses immediately following the
array or matrix variable. For example, A(ROW), A(1), A(X + 1).
Variable: Any variable. May be mvar, avar, or svar .
Arithmetic operator.
Logical operator.
Arithmetic Expression: Generally composed of a variable ,
function, constant, or two arithmetic expressions separated by an
arithmetic operator .
Logical Expression: Generall y composed of two arithmetic or
string express i ons separated by a logical operator. Such an ex-
pression evaluates to either a 1 (logical true) or a 0 (logical false).
For example, the expression 1< 2 ev aluates to the value 1 (true)
while the expression "LEMON" = "ORANGE" evalua t es to a zero
(false) as the two strings are not equal.

Atari 800 Specifications

General

Brand	Atari
Model	800
Category	Desktop
Language	English