IMSAI Score update/Spare BYTEs/Got an Altair too

Randy McLaughlin cctalk at
Sat Jun 4 18:03:58 CDT 2005

From: "Dave Dunfield" <dave04a at>
Sent: Saturday, June 04, 2005 5:40 PM

> >Don't worry too much about ripple on an S100 supply. The S100 supply is 
>>not regulated -- the regulators are on each of the boards (the 8V input 
>>is designed to be regulated down to 5V, etc). The regulators should take 
>>care of small amounts of ripple on the backplane supply lines.
> Agreed: Rich, what I ment when I told you to check for ripple, would be
> "big" ripple, which would be an indication of the filter caps having
> dried out - not all that likely, but worth checking. The input to the
> regulators should not drop below 7v under load.
> I always scope supplies under initial load tests - You never know what
> odd things you might see...
> Regards,
> Dave
> -- 
> dave04a (at)    Dave Dunfield
> dunfield (dot)  Firmware development services & tools:
> com             Collector of vintage computing equipment:

Generally Imsais have much less ripple than Altairs (bigger filter caps).


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