11/45 RTC

Jay West jwest at classiccmp.org
Tue Mar 28 09:33:21 CST 2006

Julian wrote...
> Have you tried this with M7800 and M787 instead of M7228? I'd say if not,
> try that, if yes, and if that works, then look over the DL11-W manual for
> some sort of compatibility issue with the 11/45.  This is just 
> speculation,
> but it's possible that you may have to use a M787 and disable the RTC on 
> the
> DL11-W or something strange like that.

I don't have a M787 card. This system arrived with two M7800's and a M7228. 
No KW11-L. It came with the M7228 (KW11-P). From what I can tell, the M7228 
can provide several different time clocks, one of which is LTC based as an 
option if you run an additional wire, but not at the normal address for the 

I want to see first if the power supply is generating a LTC L signal, and 
then see where it goes. Right now I'm trying to just find the signal. It 
would obviously go to slot 1C somewhere for the M787. But I can't seem to 
figure out if it was by default also provided to a pin in the 3 unibus slots 
built in to the system unit in order for the DL11-W to take advantage of.


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