Atari 400 User Manual

28 User's Handbook to the Atari 400/ 800 Computers
The access hole will contain one or two switch levers. The
position
of these levers determines the drive number. Drive 1's
levers are
both positioned to the left. Only the black lever in
front may be visible, at it may be hiding the white lever which is
situated behind it.
Illustration 2-5. Determining the Disk Drive Number
Once you have determined which drive is drive 1, insert either
the 'Disk File Manager Master Copy', a 'Disk File Manager II
Master Copy ', or a copy of one of these in that drive. The label
side
of the diskette should be facing up . Slide the diskette all the
way in and close the door behind it .
Step
3. Turning on the 850 Interface Module
The 850 Interface Module only needs to be turned on if a device
is attached to it. If not, you can leave it off.
Step
4. Turning on the Atari 400/800
You now are ready to turn on the heart of your Atari system --the
Atari 400 or 800 computer. First of all, be certain that the correct
ROM cartridge has been installed, and that all system

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)