Atari 400 Service Manual

Figure 5-17. 400 Console, Bottom Cover Screw Location
2. Keyboard removal, refer to Figure 5-19
• Remove single Keyboard screw (no. 6 32x1/4)
• Raise left end of Keyboard and disconnect Keyboard Ribbon
Cable
3. Power Supply Removal, refer to Figure 5-20 o Disconnect RF Cable
from Power Supply
• Remove two screws (no. 6 32x3/8) from Power Supply
• Gently pull Power Supply away from casting 1/4 inch and lift
out the Interlock Switch plunger
• Lift Power Supply straight up off the Motherboard connector
pins.
Access to CPU, RAM, and Motherboard:
1. Module Assembly removal, refer to Figure 5-21
• Disconneet and remove Speaker assembly
• Lift Module Assembly out of Bottom Cover
2. CPU and RAM Printed Circuit Board Removal
5-31 System Service Manual

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)