Hey all,
I recently acquired a KA655-AA (MicroVAX 3800/3900 CPU) and some
appropriate RAM, and I'm having trouble grokking the console SLU
output. If I'm reading the docs correctly (and I have to go all
the way back to the KA630 docs to find the proper switch polarity),
if I'm running it without a bulkhead attached at all, the serial
speed should be 300 baud. When my terminal is running at 300,
8 bit, no parity, 1 stop bit, I get some garbage on screen but
not much more.
Am I missing something? Do I need to do some magic with the front
panel ports to make it cooperate? I'm using a DB25 serial cable
that I've been using on my KDF11-B CPU board with no trouble; if
I look at the docs, it looks like it should be fine assuming I can
let DTR float (it's unused in my cable, since it's an external
clock pin on the KDF11-B). I can also see the LEDs on the spine
of the CPU counting down, though I didn't watch for long enough to
see if they ever got to zero.
As far as I know, the memory is connected OK and works, though I
assume I don't really need that if I just want to see a console
prompt. I'm using a very short (~3") 50-pin SCSI ribbon cable,
which I assume is OK. And it's an MS650-BA, which the KA655
manual specifically calls out, because the -AA is too slow.
- Dave