Atari 800 Basic Reference Manual

RESERVED
WORD:
LET
LIST
LOAD
LOCATE
LOG
LPRINT
NEW
NEXT
NOT
NOTE
ON
OPEN
OR
PADDLE
PEEK
PLOT
POINT
POKE
POP
POSITION
PRINT
ABBREVIATION:
LE.
L.
LO.
LOC.
LP.
N.
NO.
o.
PL.
P.
POK.
POS.
PR. or?
BRIEF SUMMARY
OF BASIC STATEMENT
Assigns a value to a specific variable name. LET is op-
tional
in Atari BASIC, and may be simply omitted.
Display or otherwise output the program list.
Input from disk, etc. into the computer.
Graphics: Stores, in a specified variable, the value that
controls a specified graphics point.
Function returns the natural logarithm of a number.
Command to line printer to print the specified message.
Erases all
contents of user RAM.
Causes a
FOR/NEXT loop to terminate or continue
defending on the particular variables or expressions.
Al loops are executed at least once .
A "
1" is returned only if the expression is NOT true. If
it is true, a "0" is returned.
See DOSIFMS Manual ... used only in disk operations.
Used
with GOTO or GOSUB for branching purposes.
Multiple branches to different line numbers are possible
depending on the value of the ON variable or expres-
sion.
Opens the specified file for input of output operations.
Logical operator used between two expressions. If
either one is true, a "1" is evaluated. A "0 ' results only
if both are false.
Function returns position of the paddle game controller.
Function returns decimal form of contents of specified
memory location (RAM or ROM).
Causes a single point to be plotted at the X, Y location
specified.
Used with disk operations only.
Insert the specified byte into the specified memory loca-
tion . May be used only with RAM. Don't try to POKE
ROM or you'll get an error.
Removes the loop variable from the GOSUB stack. Used
when departure from the loop is made in other than
normal manner.
Sets the cursor to the specified screen position.
I/0 command causes output from the computer to the
specified output device.
Appendix A-3

Atari 800 Specifications

General

Processor	MOS Technology 6502
Processor Speed	1.79 MHz
ROM	10 KB
Graphics	ANTIC and GTIA chips
Release Year	1979
Display Resolution	up to 320 x 192
Colors	128 colors
Sound	4 channels
Storage	Cartridge, cassette, floppy disk
Ports	Cartridge, serial, monitor
Operating System	Atari OS