Atari 400 User Manual

Atari 810 Disk Drive 211
Illustration 7-5. Soft Sectored Diskette
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Single and Double Sided Diskettes
Some floppy diskettes are designed to be written on on ly one
side. These are known as single sided (55) diskettes.
Diskettes
which are designed to be written on both sides are
known as double sided (OS) diskettes.
Single, Double and Quad Density Diskettes
Density refers to a diskette's recording format, which in turn
affects its capacity. Single density 5 '1f.1 inch diskettes have rough ly
94K
of capacity, double density 5'1f.1 inch diskettes have a capacity
of about 140-160K, and quad density 5'1f.1 inch diskettes have a
capacity
of up to 370K.
The Atari 810 uses single sided single density diskettes. The Atari
810 has a total storage capacity of 88,375 bytes. This figure is
calculated by mu l tip l ying the 707 sectors available for data
storage
by 125 bytes per sector. Three bytes per sector are
allocated
for the File Management Subsystem.

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)