11/34 sanity check

Paul Anderson useddec at gmail.com
Sat Apr 25 15:09:09 CDT 2015

I only have time to glance at this now, but if you said -5, + 20 vdc, isn't
that a H754 ? that sounds like a core regulator. The H745 is for mos. Am I
not awake yet and I missed something?


On Sat, Apr 25, 2015 at 11:54 AM, Henk Gooijen <henk.gooijen at hotmail.com>

> My memory is not clear, so best to do is some manual reading.
> For example, can you put the M9301 (or M9312) and M7859 in slot 3?
> Or is slot 3 sort of reserved for M8267 or M8268, and should the
> terminator and console interface go in slot 4?
> No effects at all from the console is (IIRC) strange. CTRL/HALT should
> work. I once had a dead M7859, as soon as I hit the numeric keys
> strange things happened, and (for example) "LAD" turned the RUN
> LED on and the system hung. The M7859 is "just another UNIBUS device".
> On my interface board it was a dead RAM chip.
> As yours is doing practically nothing, check whether all ICs are in
> the sockets ... some vandal may have ripped the 8008 processor to sell
> is as @*LOOK RARE *@
> On my 11/34, a lamp (RUN, SR DISP, BUS ERR, MAINT) is either bright
> ON or 'very' OFF.     I never used MAINT, should do that some time ...
> Grant problems can hang the bus (BUS ERR ON), but as you know,
> you can check that by removing the M9302 at the far end. I think you
> should keep the M9301 next to the CPU installed.
> If you want the 11/34 to do something you probably *need* the M7856 at
> 777560 as console. The CPU wants to dump it registers
> there at startup ...
> - Henk

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