Atari 400 Service Manual

Figure 2-4. ATARI Disk Drive Cable Connections
CAUTION
Do not operate the printer without ribbon or paper or you
may damage the printer mechanism.
2.10 USING THE ATARI 850 INTERFACE MODULE
The ATARI 850 Interface Module expands the interface capabilities of
the ATARI Personal Computer Systems. The interface module connects to
the ATARI 400 and 800 Computer Consoles via an I/O CONNECTOR port
(two provided) and has four EIA RS232C compatible ports, an 8-bit
parallel output interface for connection to the ATARI 825 80 Column
Printer. Any of the serial ports can be used with the ATARI 830
Acoustic Modem. Refer to Figure 2-6 when connecting each of the
following devices.
2.10.1 Connecting the ATARI 850 Interface Module
The following steps detail the connection of the ATARI 850 Interface
Module to the ATARI 400/ 80 0 Computer Consoles :
• Verify that the Power switch is OFF.
• Plug the AC Power Adapter into an AC outlet (wall plug. 115Vac
nominal) and then plug the other end into the power recepticle on
the interface module.
2-8 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)