Curiosity about power supplies (BA11)
ak6dn at mindspring.com
Tue Mar 28 12:45:00 CST 2006
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
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