Atari 400 Service Manual

Figure 2-6. ATARI 850 Interface Module Cable Diagram
2.10.3 Connecting the ATARI 830 Acoustic Modem
The ATARI 830 Acoustic Modem is a stand-alone acoustically coupled,
frequency shift keying (FSK) modem. It must be connected to the ATARI
400/800 Computer Consoles with the ATARI 850 Interface Module.
Connect the acoustic modem as follows:
• Check to see that the Power ON/OFF switch is in the OFF position.
• Plug the CX87 Modem Cable into one of the RS232C Interface ports
on the ATARI 850 Interface Module, and into the I/O CONNECTOR port
on the ATARI 830 Acoustic Modem.
• Plug the AC Power Adapter into a wall outlet (115 Vac nominal) and
plug the power cable into the power receptacle on the acoustic
modem.
• Refer to the ATARI 830 Acoustic Modem Operator's Manual for
information on proper set-up and operation of the modem.
ATARI Personal Computers 2-10

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)