Curiosity about power supplies (BA11) - test-drb@ccmp.vtda.org

28 Mar 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 DRAM devices.
  Actually, what I meant was EXAM errors.  I can DEP but not EXAM.

However, this is sort of amusing, because what I'm basically doing is
entering an address, and depositing a value into /dev/null.

This could very well mean there's nothing wrong with any of my equipment,
and once my MOS memory arrives, the problem might clear itself up.

Thanks again, Don.