Atari 400 Hardware Manual

COLBK (Background Color)(DOlA): This address writes data to the
Background Color-Lum Register.
Color
Luminance
I I I I I
Not I
D7
I
D6
I
D5
1
D4 D3
I
D2
I
Dl Used
X X X X 0 0 0 Zero Luminance (black)
0
0
1
ETC.
1 1 1 Max. Luminance(white)
0
0
0 0 Grey
0 0 0 1 Gold
0
0 1
0
Orange
0 0 1 1
Red-Orange
0
1
0 0 Pink
0 1
0
1
Purple
0 1
1 0
Purple-Blue
0
1
1 1 Blue
1
0 0 0
Blue
1
0 0 1
Light-Blue
1 0 1 0 Turquoise
1
0 1
1 Green-Blue
1 1
0 0
Green
1 1 0 1
Yellow-Green
1 1
1 0
Orange-Green
1
1 1 1
Light-Orange
OS SHADOW: COLOR4 (2C8)
E.
PLAYERS AND MISSILES
DMACTL, GRACTL, PMBASE and PRIOR also affect players and missiles.
COLPMO- COLPM3 (Player-Missile Color)(D012, D013, D014, D015): These
addresses write to the Player-Missile Color-Lum Registers. Missiles have
the same color-lum as their player unless missiles are used as a 5th player
(see bit 4 of PRIOR). A 5th player missile gets its color from COLPF3.
D7 D6 D5 D4 D3
D2
Dl
DO
(see COLBK for bit assignments)
OS SHADOWS: PCOLRO - 3 (2C0-2C3)
GRAFPO - GRAFP3 (Player Graphics Registers): (PO DOOD, Pl DOOE, P2 DOOF,
P3 DOlO): These addresses write data directly into the Player Graphics
Registers, independent of DMA. If DMA is enabled then the graphics registers
will be loaded automatically from the memory area specified by PMBASE(see
page II. 3).
I D7 : D6
D5 D4 D3 D2
Dl DO
Left
Right
Player on TV Screen
III.9

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)