24 Nov
2015
24 Nov
'15
6:07 p.m.
On 11/24/2015 05:52 PM, Mark Wickens wrote:
4. The most difficult bit, I suspect, would be
the PSU LTC signal ,
which I believe is some kind of clock. I don't know what the spec of the
signal is, but I will get a scope on a working one to see (NB don't want to
risk a working PSU on this machine in case it was a problem with the
machine
itself that caused the first PSU to fail, I don't mind sacrificing a modern
PSU if need be).
The line time clock is a vestige of the Q-bus LSI-11
heritage. As far as I know, there is a reserved bus signal,
but it was NOT implemented on the UVAX-II system. (I don't
have my print set anymore.)
Jon