ACS Altos 3068
afra at aurigae.demon.co.uk
Sat Jan 3 04:25:17 CST 2009
jeff.kaneko at juno.com wrote:
> WHat's the approximate vintage of this machine?
> I'm asking because many early designs (pre 1988,
About the 1986-88 time frame.
> or so) used non-standard 'SCSI like' interfaces
> to talk to ST-506 or ESDI drives.
Well the machine's drives are ST-506 MFM drives controled by a WD2010,
though oddly with 16 sec/trk rather than the more normal 17, that most
PC MFM interfaces used. It also has a QIC-02 60M tape drive, and a 1.2M
> The Adaptec ACB-4000 was such a device, for example.
> It was marketed as a SCSI bridge, but in reality it
> was closer to SASI. OMTI made similar boards,
> and you could almost never sub one for the other
> because of different implementations of SCSI.
Yeah I have an external disk box for the RM-186 that as I believe a
Xybec SASI to ST-506 board in it, I tried getting that to talk to a
moden controler and it would not, though I have recently discovered that
Adaptec SCSI cards don't seem to like really old drive like this which
may have been part of the problem in that case.
> I saying all of this because if this is true, then
> attaching a modern SCSI drive will get you nowhere.
Indeed, though it is labeled as SCSI on the back of the machine, and I
remeber there being a similar looking SCSI chip in there to the ones in
the Sun-3 systems I used to own.
Phill Harvey-Smith, Programmer, Hardware hacker, and general eccentric !
"You can twist perceptions, but reality won't budge" -- Rush.
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