Atari 400 Basic Reference Manual

SCREEN
EDITING
3
EDIT
FEATURES
In addition to the special function keys described in Section 1, there are cursor
control keys that allow immediate editing capabilities. These keys are used in
conjunction with the 4.jiii$M or Gml keys.
The following key functions are described in this section:
Gml Gml
11
H-i3;il
m1l
1
41
111
1
4
Gml
mDI Gml
2
Gml D
41111jM
•t:M3;''
m1l
3
Gml D
AiU!il
mma
'='d:t.U'
Gml
=
@I hiM MIP.!itiJ«•M;M
..
Gml
=
The keyboard and display are logically combined for a mode of operation
known as screen editing. Each time a change is completed on the screen, the
l;iiiii!;ill key must be pressed. Otherwise, the change is not made to the program
in RAM.
Example:
1 f1 F.~Ei'1 PF.~E~:;::; ~:ET~JR~·~ AFTEF L I f·~E EDIT
2t1 F·R I ~-iT : PP I f·.iT
30 F·~~Ir·iT HTHI~:; IS LI:·-~E 1 Ot·~ THE :::cPEEf·-i. !1
To delete line 20 from the program, type the line number and press the l;iiill;lll
key. Merely deleting the line from the screen display does not delete it from the
program.
The screen and keyboard as I/0 devices are described in Section 5.
41111$4
Control key. Striking this key in conjunction with
the arrow keys produces the cursor control functions
that allow the user to move the cursor anywhere on
the screen without changing any characters already
on the screen. Other key combinations control the
setting and clearing of tabs, halting and restarting
program lists, and the graphics control symbols.
Striking a key while holding the Gml key will pro-
duce the upper-left symbol on those keys having
three functions.
Shift key: This key is used in conjunction with the
numeric keys to display the symbols shown on the
upper half oft hose keys. It is also used in conjunction
Edit Features 13

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)