Atari 400 Field Service Manual

GROUND
VSS
CTIA
Data
ANJJ
CTIA
Data
AN
I
Light Pen
EP
CTIA
Data
AN2
Interrupt
Input
RNMl
Interrupt
Output
NMl
Refresh
REF
HALT
HATt
Address
Bus
A3
Address
Bus
A2
Address
Bus
Al
Address
Bus
AH
Read/Write
R/W
Ready
RDY
Address
Bus
AlO
Address
Bus
A12
Address
Bus
A13
Address
Bus
AH
Address
Bus
A15
*0
D*
Data
Bus
39
D5
Data Bus
38
D6
Data
Bus
37
07
Data
Bus
36
ft^
Reset
35
FPhJf
Fast
Phase
C
3*
Phtf Phase
Clock
33
D3
Data Bus
32
D2
Data Bus
31
Dl
Data
Bus
30
D^
Data
Bus
29
Ph2
Phase
2
Clock
23
A4
Address
Bus
27
A5
Address
Bus
26
A6
Address
Bus
25
A7
Address
Bus
2*
AS
Address
Bus
23
A9
Address
Bus
22
All
Address
Bus
21
VDD
5V
Power
Figure 1-^.
ANTIC Pin
Assignments
ATARI
Home
Computer
I
-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)