Atari XL User Manual

Player-Missile Graphics
175
REGISTER EFFECT
LOCATION
PMOCOL
Player/Missile 0 colour
704
PM1COL Player/Missile 1 colour
705
PM2COL Player/Missile 2 colour 706
PM3COL
Player/Missile 3 colour
707
POHPOS
Player 0
position
53248
P1HPOS
Player 1
position
53249
P2HPOS Player 2
position
53250
P3HPOS Player 3
position
53251
MOHPOS
Missile 0 position
53252
M1HPOS Missile 1 position
53253
M2HPOS
Missile 2 position
53254
M3HPOS Missile 3 position
53255
POSIZE Player 0 size
53256
P1SIZE
PI
ayer 1 size 53257
P2SIZE
Player 2 size
53258
P3SIZE
PI
ayer 3 size 53259
MSIZE Size
of all missiles
53260
POGRAPH Player 0
graphics
53261
Pl GRAPH Player 1
graphics
53262
P2GRAPH Player 2
graphics 53263
P3GRAPH
Player 3
graphics
53264
MGRAPH Graphics for all missiles 53265
Player-Missile Control Registers
how to turn players into spaceships, we must study
the GTIA in a bit more detail.

Atari XL Specifications

General

Release Year	1983
CPU	MOS Technology 6502C
Graphics	ANTIC, GTIA
Sound	POKEY (4 channels)
Storage	Cassette tape
Ports	Cartridge
Operating System	Atari BASIC
CPU Speed	1.79 MHz
RAM	64 KB