8 Jun
2014
8 Jun
'14
3:17 p.m.
On Sun, Jun 8, 2014 at 3:50 PM, Chuck Guzis <cclist at sydex.com> wrote:
77615454
I'll see if I have anything.
Thanks!
Remember that we're dealing with 8"
drives--big AC motor with a
flywheel/pulley on the hub that you could injure someone with. Really
simple to design for. Early 5.25" drives, on the other hand were a
nightmore in terms of ISV and speed control in general. It wasn't until
the direct-drive crystal-controlled 5.25" drives that these problems pretty
much went away.
The MPS-90F board used in the Quay 900 was designed to work with either 8"
or 5.25" drives. AFAIK the 900 was always configured with 8", but they
sold the board separately for OEM use. While the floppy header is 50-pin,
they have a row of jumpers for even pins 2-34 to configure for 8" ("S") or
5.25" ("M"). It's certainly possible that it might have received
little
testing and performed poorly with 5.25" drives.
The SIO, IIRC, did not have an internal BRG, so you were in for that one,
regardless.
Right. I've been hacking Z8530 SCC code so much lately that I forgot that
the BRG is one of its improvements relative to the SIO.
What's the part number for the PWA on the 8" drive that you have?