Curiosity about power supplies (BA11)

[Don North]

Julian Wolfe wrote:
>> A standard BA11-K box has 2xH744 (or later 2xH7441), 1xH745, 
>> 1x54-11086, and usually a spot for 1xH754 (for core memory, 
>> not req'd if no core).
>
> Oh CRAP.  I built this machine from parts (albeit all marked 11/34), and did
> NOT know that I needed an H754 for core.  Would this couse the deposit
> errors I'm experiencing?
>
>
>

Probably; your core memory is unpowered (H754 supplies +20V & -5V to 
core memory modules).

AFAIK the ONLY use for the +20V/-5V H754 brick is for core memory.

The MOS memory boards for the 11/34 box (MS11-L) use the +15V/-15V from 
the backplane and have onboard regulators to generate +12V/-5V for the 
DRAM devices.