[HECnet] old problem with 11/34 solved

Hey folks. Remember when I was losing my mind trying to get my PDP-11/34 up and running RSX-11M just before VCF-East in April, and it kept crashing during sysgen? Well...it turns out that my FP11-A board was flaky. It failed some of its tests in XXDP. Then I ran some XXDP tests on the processor itself, and it failed in a couple of places in the MMU tests. That explains why it ran RT11 just fine, but not a more demanding-on-the-MMU OS like RSX. So I replaced the FP11-A with one that passes its tests (no time to troubleshoot it right now, and I have a few spares) and was about to start working on the CPU, when I decided to re-run the MMU tests. Now the MMU checks out fine. I put the originally flaky FP11-A board back, and the MMU tests fail again...so somehow this FP11-A is wreaking havoc with the MMU. So now the machine is about midway through phase II of sysgen, running great, and seems to be rock solid. -Dave -- Dave McGuire, AK4HZ New Kensington, PA