18 Jul
2014
18 Jul
'14
3:46 p.m.
On 2014-07-18 15:22, Tony Duell wrote:
If you
have a -U CPU board, there is no RAM built into the machine. You
must have a RAM board in an exmapnsion slot, and it must be addressed at
the top of the address space
I have the straight 9836 board int it,
was just hoping/dreaming of the -U.
Giuven that thaere are several edge conenctors
involved between the CPU
board and RAM (CPU board to motherboard, motherboard to expansion
backplane, expanssion backplane to RAM board), a lot of RAM problems are
nothing more than bad contacts somewhere. It's worth pull all the boards
and cleaning the edge bingers nad connecotrs.
I did that already, checked and cleaned all the connectors.
And I have more than one RAM board to test with, and all behave the same.
No memory pluggen in, the system complains, that it didn't find any.
One memory module plugged in, Memory fault at fffefffc ...
(All other boards removed, tried different slots, different RAM Boards)
And as this backplane seem to be completely passive, my guess is, that
it is the CPU boards problem.
So my guess would be the transceivers to the bus (there is a whole line
of '245s)
Cheers