11/34 sanity check

Josh Dersch derschjo at gmail.com
Sat Apr 25 21:34:11 CDT 2015

On 4/25/15 1:09 PM, Paul Anderson wrote:
> 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?
There's both a 754 (-5V, +20V) and a 745 (+15V) supply in this thing.  
When I acquired the machine (which had long since been decommissioned, 
it was equipped with 128KW of MOS memory, I assume this is how it had 
been used so I hope everything's kosher...

- Josh

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