22 Oct
2016
22 Oct
'16
10:43 a.m.
From: shadoooo
they can run linux for the software side
Maybe it's just me, but running Linux on an interface card strike me as
somewhat grotesque. It's bad enough running a far faster chip than the vintage
CPU, but... a majorly complex operating system to boot?
I'm trying to figure if an hybrid QBUS / UNIBUS
solution is possible.
Of course one have to switch some jumper to avoid conflicts
Lots and lots and lots and lots of jumpers. The two buses are completely
unlike, pinout-wise.
And the UNIBUS board has to be a quad, and there are some QBUS chassis which
only take duals...
What kind of bus transceivers did you used for the
QSIC
We used a mix of DS8641 quad transceivers (they're still available in
reasonably good numbers for a reasonable price) and AM2908 octal latching
transceivers with a tri-state output (to allow us to have a bidirectional
internal bus for BDAL00-BDAL21 - we were trying to minimize the number of pins
needed on the FPGA to interfaces to the QBUS). But we probably will use a
different FPGA on the production boards, and all DS8641's.
you have to go from 5V open-drain logic to 3.3V logic?
We do that with separate 74LVC7T245 level converter chips.
Noel