Atari 400 User Manual

212 User's Handbook to the Atari 400/ 800 Computers
Diskette Write Protection
Diskettes have a notch on the side of their protective envelope
which determines whether or not data can be written onto that
diskette. On 8 inch diskettes, this notch is known as a write-
protect notch . On 5114 inch diskettes, it is known as a write-
enable notch.
On an 8 inch diskett e, information cannot be written onto the
diskette
unless this notch has been covered. On 5114 inch
diskettes, information cannot be written onto the diskette unless
the notch is left uncovered.
Some
5114 inch diskettes (especially system diskettes) may be
permanently write protected if their protective envelope does
not contain a notch. Any 5 114 inch diskette with a notch can be
write protected by merely covering the notch with a piece of
tape as shown in Illustration 7-6.
Illustration 7-6. Write Protecting a 5114 Inch Diskette

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)