Atari 400 Basic Reference Manual

MODEO
MODE1
OR
MODE2
Table 9.7-CHARACTER/COLOR ASSIGNMENT
Conversion 1
Conversion 2 Conversion 3
Conversion 4
zSETCOLOR
2 #+32 #+32 #-32
NONE
POKE 756,224
POKE 756,226
SETCOLOR 0
_$32
#+32
#-32
#-32
SETCOLOR 1
NONE #+64
#-64
NONE
SETCOLOR 2
#+160
#+160
#+96 #+96
SETCOLOR 3 #+128
#+192 #+64
#+128
Z. Luminance controlled by SETCOLOR 1, 0, LUM.
3. POKE the Character Base Address (CHBAS) with 226 to specify lower case let-
ters or special graphics characters ; e.g.,
POKE
756,226
or
CHBAS = 756
POKE CHBAS, 226
To return to upper case letters , numbers, and punctuation marks , POKE CHBAS
with 224.
4. A PRINT statement using the converted number (82) assigns the lower case
"r" to SETCOLOR 0 in mode 2 (see Table 9-5).
Graphic Control Characters
These characters are produced when the &ml ke y is pressed with the
alphabetic keys shown on back cov e r. These characters can be used to draw
design, pictures, etc., in mode 0 and in modes 1 and 2 if CHBAS is changed .
56 Graph ic Mod es and Co mmands

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)