Re: [cc65] CBM units

From: Mark J. Reed <>
Date: 2010-02-21 19:15:29
On Sun, Feb 21, 2010 at 11:56 AM, Spiro Trikaliotis
<> wrote:
> The serial device numbers on the bus can be 0-30. The higher bits are
> "FLAGS", and the device number 31 is used for special cases (UNTALK,

Right, but I was wondering if there was a range of numbers assumed to
be disk, the way 4 and 5 (and maybe 6 and 7?) are assumed to be
printers.  I know the Commodore drives were usually hardware
switchable among device numbers 8, 9, 10, and 11...

>> all you know is that
>> the last operation wasn't to disk.
> Not even that. You can also build a disk on #4, #5, #6 or #7, for
> example. You cannot rely on the device number being unique for a device
> type.

Fair enough, but TTBOMK there were no drives actually manufactured for
Commodore machines that had unit numbers below 8.

Mark J. Reed <>
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Received on Sun Feb 21 19:15:39 2010

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