Date   : Fri, 24 Apr 1992 10:23:47 MEZ
From   : Uwe Nass <UNF315@ibm.rhrz.uni-bonn.de>
Subject: DOS <> CPM on cp/m

Hi all,

I am also interested in reading, writing and maybe even formatting 360K
PC disks in my CPM drive. But as far as I learned, all programs that
are mentioned in this list, assume that the physical sector length is
512 bytes long. Debugging my BIOS I found that my FDC is programmed to
use 256 byte sectors and to pack 8 sectors on side 1 and 8 sectors on
side 2 (total: 16 sectors per track). Since the FDC is a uPD765,
which I think was used in old PC-XT's too, there should be no problems
doing the required tasks, if somebody can tell me how to progam the
appropriate registers; i.e. I need information for such things like
GAP length, fill byte, etc. Can anybody out there provide me this
informations? Has anybody written a program to format such a drive?
Is my opinion correct, that the physical data like HEAD UP TIME, STEP
RATE, HEAD LOAD TIME, neeed not to be changed?

                                                    Thanks in advance

                                                           Uwe

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