20 Oct
2006
20 Oct
'06
2:45 p.m.
I recently sold a Qumetrak 842 8-inch floppy drive to a fellow who's
restoring a CMI vintage synthesizer. He says that this particular model
is what the synth uses. Can anyone think of a reason why he couldn't use
some other model of drive as long as it's capable of reading DSDD media?
--
David Griffith
dgriffi at cs.csubak.edu
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20 Oct
20 Oct
2:59 p.m.
On 20 Oct 2006 at 11:45, David Griffith wrote:
I recently sold a Qumetrak 842 8-inch floppy drive to
a fellow who's
restoring a CMI vintage synthesizer. He says that this particular model
is what the synth uses. Can anyone think of a reason why he couldn't use
some other model of drive as long as it's capable of reading DSDD media?
Seek rate can vary all over the place with 8" drives. I think the
842 will handle either 6 or 8 ms track-to-track, but others may
require as much as 30 msec.
--Chuck
4:26 p.m.
> I recently sold a Qumetrak 842 8-inch floppy
drive to a fellow who's
> restoring a CMI vintage synthesizer. He says that this particular model
> is what the synth uses. Can anyone think of a reason why he couldn't use
> some other model of drive as long as it's capable of reading DSDD media?
On Fri, 20 Oct 2006, Chuck Guzis wrote:
Seek rate can vary all over the place with 8"
drives. I think the
842 will handle either 6 or 8 ms track-to-track, but others may
require as much as 30 msec.
Especially interesting because the Qumetrak 142 5.25" drive was the
slowest one that had come along. So slow that MS/PC-DOS 2.10 was needed
to allow for it.
5:30 p.m.
On 20 Oct 2006 at 13:26, Fred Cisin wrote:
Especially interesting because the Qumetrak 142
5.25" drive was the
slowest one that had come along. So slow that MS/PC-DOS 2.10 was needed
to allow for it.
The tail end of the Micropolis 5.25" line was so horrifically slow,
that they incorporated buffered seek into it. This was circa 1983-
84.
Cheers,
Chuck
3:13 p.m.
From: "David Griffith"
Subject: 8-inch drive substitutes
I recently sold a Qumetrak 842 8-inch floppy drive to
a fellow who's
restoring a CMI vintage synthesizer. He says that this particular model
is what the synth uses. Can anyone think of a reason why he couldn't use
some other model of drive as long as it's capable of reading DSDD media?
I've seen at least 3 different power connectors, so that could be a reason.
Maybe his drive uses voltages different from +5 and +24. I've also seen some
differences with regard to the position of the mounting holes. And then we
have of course half vs. full height.
Nico
3:48 p.m.
On Fri, 20 Oct 2006, David Griffith wrote:
I recently sold a Qumetrak 842 8-inch floppy drive to
a fellow who's
restoring a CMI vintage synthesizer. He says that this particular model
is what the synth uses. Can anyone think of a reason why he couldn't use
some other model of drive as long as it's capable of reading DSDD media?
lack of complete standardization of power supply voltages and connectors
lack of complete standardization of mounting hole locations
obscure feature/jumper combinations
esthetics of matching appearance of adjacent drive
desire to retain original appearance
we once had a nasty go-round with Merganthaler about service with an
"after-market" drive installed
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5 comments
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cclist＠sydex.com -
cisin＠xenosoft.com -
dgriffi＠cs.csubak.edu -
nico＠farumdata.dk