Commodore VIC-20 User Manual page 42

28
The VIC 20 User Guide
TAlu1·3. 1540 Disk Drive Specifications
Storage
Total capacity
Sequential
Relative
Directory entries
Sectors per track
Bytes per sector
Tracks
Blocks
Ie's:
6502
6522 (2)
Buffer
2114 (4)
Physical:
Dimensions
Height
Width
Depth
Electrical:
Power requirements
Voltage
Frequency
Power
Media:
Diskettes
174,848 bytes per diskette
168,656 bytes per diskette
167,132 bytes per diskette
65,535 records per file
144 per diskette
17 to 21
256
35
683 (664 blocks free)
microprocessor
1/0, interval timers
2KRAM
97mm
200mm
374mm
100, 120,220, or 240 VAC
50 or 60 Hz
25 Watts
Standard mini
5-1/4",
single-sided,
single-density
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Indicator Ughts
The 1540 disk drive has two indicator lights on its front panel. The
green one will glow when power is applied to the unit. The red one is the disk
activity indicator.
It
will glow when the drive is running, and flash ifthere is
an error condition.
loading and Unloading Diskettes
Figure 1-11 illustrates the various parts of a floppy diskette. The
magnetic surface itself is a disk made of a thin, flexible plastic similar to the
material used in cassette tapes. This fragile disk is enclosed in a protective
jacket. The jacket is then placed in an envelope that protects the read / write
slot.
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