Atari 400 Hardware Manual

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; ltHT OS'S DMACTL VARIABLE
; IIISTRUCTION FETCH
DMA ENABLE, P/M 2 LINE RES. P/M DMA ENABLE. STA14DARO SCREEN <160 CLOCKS>
LDA esZE
STA SOMCTL
;CLEAR RAM
LDA e0
TAX
INITLP
STA
Pl'18,)(
STA
PMB+S1.00.X
STA
PI'18+S200.X
STR
PMB+SJ00.X
STR PMB+S400.X
INX
BNE INITLP
; INITIALIZE MISSILE GRAPHICS FOR BORDERS
LQPZ
LDA esee:
LD~ eSSE
STA GRM93+S1.4.~
DEV
BNE LQPZ
;INITIALIZE TOP AND BOTTOM BORDERS.
TBLP
.1.6
eCLBOR+BORDER
TOPBRD-1..
~
BOTBRD-1..~
L~
LDA
STA
STA
DEV
Bt£ TBLP ; CONTINUE UNTJ L ~=0
; INITIALIZE PLA'<ER GRAPHICS FOR SQUARES <CHECKER BOARD> ~·0
LDA eSF0
IN2 LDX e10
IN3 STA GRP0+$18.Y
STA GRP1.+S1.8,Y
STA
GRP2+$1.8.~
STA GRP3+S1.8,V
\

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)