For a quick read of the most important information of the M9312, see www.pdp-11.nl/pdp11-34a/cpu/options/bootstrap-info.htm<http://www.pdp-11.nl/pdp11-34a/cpu/options/bootstrap-info.htm>
It contains some interesting side notes from Don (at the end) Van: Noel Chiappa via cctalk<mailto:cctalk@classiccmp.org> Verzonden: donderdag 14 december 2017 13:47 Aan: cctalk@classiccmp.org<mailto:cctalk@classiccmp.org> CC: j...@mercury.lcs.mit.edu<mailto:j...@mercury.lcs.mit.edu> Onderwerp: Re: 11/04 Project > From: John Welch > CLR > 765000 > LAD > EXAM > 'Bus Err' light comes on. Oooh, that's very interesting, and illuminative. The ROM isn't working (so there's no way for the software console to work - its code is in that ROM). So look at Section 1.5 of the Technical Manual http://bitsavers.org/pdf/dec/unibus/M9312_TechRef.pdf and make sure all the jumpers on the M9312 are as required. In particular, jumper W-8 should be _out_. If it's not, that would explain why the ROM at 765000 isn't resonding. If it's in, that M9312 board probably has a problem. Also, while we're at it, it's probably worth making sure the CPU will run. Do this: CLR LAD 777 (This is a 'branch .' instruction) DEP EXAM (Should display '777') CLR (I think you can dispense with these LAD two, but just to be safe...) CTRL-START 'Run' light should come on CTRL-HALT 'Run' light should go out, should display '0' (or maybe '2', I forget) > Do you know which color wire (red, clear, black) goes to which festoon > connector (TP1, TP2, TP3, TP4)? I would leave them all disconnected for the moment; you don't need them. One is the 'boot' switch on the console, and its ground. The other is the 'boot on power on enable' (a duplicate of S1-2), and its ground. Since we're trying to manually start the ROM console from the front console, they aren't needed for that. I don't recall offhand which one connects to which - I will have to check. > Don't want to blow anything up. Not sure it will harm anything if you connect things wrongly, but that's not tested. Noel
