Atari 400 Basic Reference Manual

DOUBLE-KEY
FUNCTIONS
14 Edit Features
1£11 D
with other keys to insert and delete lines, return to a
normal, upper case letter display, and to display the
function symbols above the subtraction , equals, addi-
tion, and multiplication operators as well as the
brackets, [ ], and question mark,?.
Cursor Control Keys
Moves cursor up one physical line without changing
the program or display .
Moves
cursor one space to the right without disturb-
ing the program or display.
Moves
cursor down one physical line without chang-
ing the program or display.
Moves
cursor one space to the left without disturbing
the program or display.
Like the other keys on the Atari keyboard, holding the cursor control keys for
more than
1
h second causes the keys to repeat.
Bml 2
Bml 3
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1
Vt1:taM
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Keys Used With BiD
Inserts one character space.
Deletes
one character or space.
Stops
temporarily and restarts screen display
without "breaking out " of the program.
Rings buzzer .
Indicates end-of-file.
Keys Used With E!71J1!
Inserts one physical line.
Deletes one
physical line.
Returns screen display to upper-case alphabetic
characters.
Special Function Keys
Stops program execution or program list, prints a
READY
on the screen, and displays cursor.
Allows commands normally used in Direct mode to
be placed in Deferred mode; e.g ., In Direct mode,
Gml 190.1;1 clears the screen display. To clear the
screen in Deferred mode, type the following after the
program line number. Press 1B then press Em1l
and E!D together.
PRINT " Ia GmJ IUf.i;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)