Atari 400 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 400 Specifications

General

Manufacturer	Atari
Model	400
Type	Home Computer
Release Year	1979
CPU	MOS Technology 6502
CPU Speed	1.79 MHz
ROM	10 KB
Operating System	Atari OS
Keyboard	Membrane keyboard
RAM	8 KB (expandable to 48 KB)
Graphics	ANTIC and GTIA chips
Sound	4 channels
Display	RF output for connection to TV
Storage	Optional cassette tape drive or floppy disk drive
Ports	Cartridge
Display Resolution	320x192 (16 colors)