28 Oct
2020
28 Oct
'20
6:29 p.m.
Appendix D in the 003 rev of the /24 TM has the
details of the -YA..
Found it. Board is also now working, and I'm selling one of them on
Ebay. I don't need 4 11/24 CPUs (why do I have these?) Anyway once
things are up I'll swap a KEF11 and a CIS chipset onto the 24 to bring
it to full power :-)
Ironically, although the QBUS uses _exactly_ the same
kind of bus grant lines,
no QBUS processor seems to check their continuity in this way; I habitually
run my QBUS machines without all the slots filled, and F11 and J11 processors
all run fine with open grant lines (after the last card that uses
interrupts). I guess DEC found out the hard way that that check wasn't
useful!
True, and while the problem may not be the bus per se, the
implementation of a pdp11 on Q-Bus just seems to have less of these
annoyances. No biggie, just the usual stuff.