On Feb 5 2005, 21:17, Pete Edwards wrote:
> Thanks everyone, looks like that's definitely an MSV11-JE, which is
> what I was hoping.
> Can anybody help on this one? It's an M8190 KDJ11-B, again with no
> additional revision ID _anywhere_ on the board. Nothing even on the
> metal strip or spacers. Looking in the field guide implies this is
> Unibus, but I'm under the impression it came from an 11/73 - could
> that be right, and it is qbus? (fingers crossed)
> The part no. is 5016017-01-C1 and it has V7 roms.
They're all the same, all QBus. Well, all the same except for speed,
ASICs, and ROMs. The ones used in 11/84 machines go in a QBus
backplane, with PMI memory in front and a KT84 QBus-to-Unibus converter
behind.
Simplifying slightly, the earliest J-11 chips would not reliably run
faster than 15MHz, and were used for 11/73s. Later ones ran at 18MHz
and were used for 11/73s, 11/83s, and 11/84s. Some ASICs did not work
correctly with the FPU accelerator, later ones did. Any set of ROMs
from the series will work in any of the boards, but later ones support
more boot devices and present different menus.
--
Pete Peter Turnbull
Network Manager
University of York
Received on Sat Feb 05 2005 - 16:04:37 GMT