8" disk drive project
grant at stockly.com
Tue Nov 6 01:04:47 CST 2007
I want to use a QUME 842 or SA800 in an altair disk subsystem.
Both seem to have the same interface.
The FD400-5x0-5x1 manual seems to show the drives being quite similar.
The first thing I see is that there are extra signals.
"Trim Erase", "Write Enable", and "Write Data" where the Shugart
interface only has "Write Data" and "Write Gate". I assume that gate
and enable are the same thing. The FD Pertec drives also have "IN",
"OUT", and "STEP" instead of "STEP" and "DIRECTION", but that is not
a big deal. That can be generated in software.
What I don't see is any input to perform the function of head
current. How does the shugart interface handle this?
Can I ignore the trim erase feature? How do I generate a write busy
signal? I'm willing to make some circuits to fake these signals if required.
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