Atari 400 Hardware Manual

Use of Player/Missile Graphics
with
BASIC, cont.
(9, cont.)
Example to Generate a rectangular box player, eight color
clocks wide and four lines high in immediate mode.
STEP TYPE
1 GRAPHICS 8
2 POKE 559, 62
3 POKE 53248,120
4
POKE 704,88
5 I = PEEK(l06)-8
6 POKE 54279,I
7 POKE 53277,3
8 J = I * 256 + 1024
9 POKE J + 125,255
POKE J + 126,129
POKE J + 127,129
POKE J + 128,255
RESULT
Setup Mode 8 Playfield
Enable P/M DMA single line
Set horizontal position
Set color to pink
Get
P/M base address
Store in base register
Enable P/M DMA
Get player starting address
Draw player on screen
A-3-

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)