I've got a Northstar Horizon that I'm starting to restore. The Northstar
manual indicates that the Northstar disk controller wants to talk to one
or two SA400s, which sounds about right considering the time period.
Problem is the only SA400s, or similar, that I have are in my SWTPC 6800
and I don't want to pull them. I know that the SWTPC will accept an
MPI-51 as a replacement for an SA400 (but not an SA400 on a controller
that expects to see MPI-51s since they have a slightly higher step rate).
Could I use an MPI-52, and under what conditions, as a replacement for
the SA400s that the Northstar wants to see? If so, why? If not, why not?
Anthony Clifton - Wirehead