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CBM Funet Archive
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Wrap
Text File
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2002-12-05
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864b
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25 lines
** fIRMWARE FOR cOMMODORE DISK DRIVES.
**
** aCCORDING TO wILLIAM lEVAK, cOMMODORE USED SIX DIFFERENT NATIVE
** DISK FORMATS:
** 2040/3040 - tHIS IS SLIGHTLY DIFFERENT FROM LATER FORMATS:
** TRACKS 18 - 24 HAVE 20 SECTORS INSTEAD OF 19.
** 2031/4040/1540/1541/1551/1570 - SINGLE SIDED, SINGLE DENSITY, 48TPI
** 1571 - a DOUBLE SIDED VERSION.
** 8050 - SINGLE SIDED, 96TPI
** 1001/8250 - DOUBLE SIDED, 96TPI
** 1581, 3{CBM-X}" dd WITH mfm
**
** wHILE WE'RE ON THE SUBJECT, cOMMODORE'S SINGLE DENSITY DRIVES ARE ACTUALLY
** DOUBLE DENSITY, AND THE DOUBLE DENSITY DRIVES ARE ACTUALLY QUAD DENSITY.
** qUAD DENSITY DISKS HAVE THE SAME CAPACITY OF HIGH DENSITY DISKS, BUT THE
** MAGNETIC FILM IS COMPATIBLE WITH DOUBLE DENSITY DISKS.
NEW/
nEW (SERIAL BUS BASED) DISK DRIVES
OLD/
oLD (ieee-488 BASED) DISK DRIVES
OTHER/
dISK DRIVES NOT MANUFACTURED BY cOMMODORE