31 Oct
2010
31 Oct
'10
10:06 p.m.
On 10/30/10 1:58 PM, Philip Pemberton wrote:
They're both differential. It's just that the
SA1000 expects you to feed it a reference clock signal. It doesn't have to be locked
against write-data, it just has to be there, and be accurate to 0.1%...
Assuming the OEM manual is accurate, of course.
It's used for the head stepping circuit on the SA1000 (schems in the svc manual)
I'm trying to figure out what the SA4000 expects. It seems to be a 140ns clock.
The main thing I need this for is recovering some PERQ data.
Just found the 4000 service manual, will have that on bitsavers soon.
Looking at the schematics, the Quantum 2000 series doesn't use it at all. Most of
my Xerox 8010 drives are from Quantum
I don't seem to have any docs for the Micropolis 8" drives.