In message <[EMAIL PROTECTED]>, Warner Losh writ
es:
>
>That's OK. The Rainbow disks have sectors numbered 1 through 10, for
>both CP/M disks and MS-DOS disks. This makes things easier to cope
>with.
Great, then no driver changes are required. I've just tried it; I
found a normal PC 5.25" drive, and I was able to read the DEC
Rainbow boot disk I have here by doing
# fdcontrol /dev/fd1
sectrac? []: 10
secsize? [2]:
datalen? [0xff]:
gap? [0x1b]:
tracks? [80]:
size? []: 800
steptrac? [1]:
trans? []: 1
heads? []: 1
f_gap? [0x54]:
f_inter? [1]:
# hd /dev/fd1 |less
Note: The `trans' values come from the 'FDC_???KBPS' #defines in
fdreg.h. A value of 1 is 'FDC_300KBPS' which is different to the
specs you quoted, but I think the PC standard 5.25" drive runs at
360rpm rather than 300. For a 300rpm drive you probably want a
trans value of 2 (250kbps).
I just left the `gap' and `f_gap' values at their defaults; I don't
know the exact details of these fields, but I seem to remember that
they are only used during writing and formatting, so you can ignore
them for reading.
>for this project. Any thumbnail about how to add a new type of drive
>to fd.c? What parameters do I need for it?
You could add an entry to the fd_types array in fd.c, but that
requires linking the entry into a device node, so it's probably
easier to just use fdcontrol.
Ian
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