cclist at sydex.com
Sat Nov 10 15:51:02 CST 2007
On 10 Nov 2007 at 15:24, Roy J. Tellason wrote:
> Just lookingat the picture in that file I retrieved makes me want to play with
> that thing a bit. :-) I think, though, that instead of the 2 5.25"
> drives I was originally intending to use with it (and which are buried
> somewhere in storage at this point, I have no idea where), I'd like to
> maybe have a go at interfacing a 3.5" drive to it. And maybe one of
> the "smaller" (2G?) SCSI drives I have around here. Think that's possible?
Certainly the SCSI drive is possible, given the interface on the BBII
(Doesn't have a SASI-ready interface or two already?) Not wide-SCSI,
but certainly 8-bit SCSI. Your biggest problem is how to deal with
2GB efficiently with CP/M-80.
3.5" floppy is easy, but a 3.5" PATA drive is more problematical,
given the 16-bit interface for data. Of course, one could throw away
half the data or even treat the drive as two units to accommodate 8-
>Best I can remember, the code did a bunch of 16-bit math that
>seemed to implement some kind of a polynomial (just a bit beyond me
>when I read it) and ran this over the contents of the EPROM,
>looking for a zero result.
Could even be XORing the contents with a LFSR. Hard to say without
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