21 Jun
2001
21 Jun
'01
12:55 p.m.
If it is CP/M format, the first track should be SD, whether or not the
disk is formatted DD. That's how it is in the CP/M systems I have. I
figure you should at least be able to read the first track and hopefully
there would be a signature of what machine it's from. What I would not
know is what interleave factor to use for the sector ordering; it seems to
vary from machine to machine. Start with the original IBM SSSD structure.
Edwin
At 08:31 PM 6/20/2001 -0700, you wrote:
The disks I am trying to access are supposedly CP/M, but the labelling
indicates they were perhaps used on an Intel development system (they have
filenames on the label with ".HEX" file types; this may not mean
anything). If this is the case, and they were formatted on an Intel MDS
(and therefore M2FM), and since they are double-density, then I may not be
able to read them with the machines I have.
However, I want to check their format on some CP/M machine and see if
perhaps I can read them. If so, then they are probably more standard DD
formatted diskettes, maybe even CP/M since that is what I was told they
are.
Suggestions appreciated.
Sellam Ismail Vintage Computer
Festival
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