Atari 400 Hardware Manual

POKEY ADDRESSES
WRITE
READ
Name
I
Description Name
I
Description
D2FF
}
t
REPEAT (AS BELOW)
15 MORE TIMES
D210
Serial Port 4
Key
Serial Port 4 Key
D20F SKCTLS
Control
SKSTAT
Status Register
IRQ Interrupt IRQ Interrupt
D20E IRQ EN Enable
IROST
Status Register
Serial
Port Serial Port
D20D SEROUT
Output
Reg. Input Register
D20C
Start Pot Scan
D20B POT GO
Sequence Vertical Line
Reset Status
Random Numb
D20A SKRES
(SKSTAT) RANDOM
Generator
D209 STIMER
Start Timers KBCODE
Keyboard Code
Read 8
Line Pot
D208 AUDCTL
Audio Control ALL POT Port State
Audio Channel
4
D207 AUDC4 Control
POT
7
Audio
Channel
4
D206 AUDF4
Frequency
POT 6
Audio
Channel
4
D205 AUDC3 Control POT 5
Read
the
Audio Channel 3
value of
D204 AUDF3
Frequency
POT 4
each POT
Audio Channel 2
D203
AUDC2 Control
POT
3
Audio
Channel 2
D202
AUDF2
Frequency POT
2
Audio
Channel
1
D201 AUDC1 Control
POT
1
Audio
Channel 1
D200 AUDF1
Frequency
POT
0
V.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)