Atari 800 User Manual

Advanced Atari BASIC 79
The following program illustrates the use of the ASC function:
050 DIM A$(20)
100 A$ = "JOHN JOHNSON"
200 PRINT ASC(A$)
300 END
RUN
74
Escape Sequences in Strings
Generally, the cursor movement characters may not be included
within a string. They may, however, be included if they are
preceded by the operator pressing the Escape key.
When the Escape key prefixes a cursor movement key, the
combination is known as an escape sequence.
The following program will illustrate the use of an escape
sequence.
100 PRINT "JOHN-N-JOHNSON"
200 END
RUN
JOHN JOHNSON
In
our example, the symbol- denotes pressing ESC followed by
CTRL-+. The symbol
- denotes pressing ESC followed by
CTRL-*.
In our previous example, the cursor movement itself was
accomplished by using an escape sequence. Each cursor
movement is also associated with a character as shown in Table4-
1. By pressing the Escap e key twice before the cursor movement
key sequence, this character will be output. This is shown in the
following program.
100 PRINT" Ed Ed Ed "
200 END
RUN
i t i

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