Re: D9060 Hard drive

From: Ethan Dicks <>
Date: Tue, 2 Apr 2013 12:12:37 -0400
Message-ID: <>
On Tue, Apr 2, 2013 at 11:51 AM, Ted <> wrote:
> I got the bright idea of just bypassing the MFM to SCSI board and installing
> a SCSI drive directly to the DOS board. The cable started melting
> immediately. I have ordered a new cable and hope I did not fry the DOS
> board.

You probably had both ends of the cable trying to provide TERMPWR.

What part of the cable melted?  (what SCSI pins?)

There are small differences between the packet commands for SASI
and SCSI-1.  There are plenty of differences between SASI and SCSI-2.

> I did try plugging in a SCSI connector to connect the drive an
> Winchester2SCSI board. Windows 7  could not recognize it.

That is entirely unsurprising.  Among other things that older
bridge cards do not support (even SCSI-1) is the IDENT
packet that pretty  much all modern systems use to request
the drive self-report its geometry.  Back in the old days, you
had to tell the OS how large the disk was and it trusted you.
Later, SCSI (and IDE) devices got smart enough that the OS
could ask the drive and not force the human to know the

Even the modern Linux drivers require IDENT to be there.

Old UNIX (4.1BSD for example) and non-mainstream OSes
like AmigaDOS let you/make you specify the drive geometry
and could be used (if the command packets sent from the
OS driver are compatible with what the drive supports) to
raw-read the drive.

Of course, there's one other wrinkle... the drive in the
D9060/D9090 uses 256 byte sectors, *not* 512 byte
sectors, which commonly confounds modern OS drivers.


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Received on 2013-04-02 17:00:48

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