Date   : Fri, 12 Dec 2003 08:45:42 +0000 (GMT)
From   : Sprow <info@...>
Subject: Re: Master 128 power supply

> > > Can anyone tell me if the master series and model B power 
> > > supplies are interchangeable?
> > 
> > Not really.
> > Mechanically they're quite different,and the Master 
> > motherboard takes less
> > current than the BBC B and the PSU is adjusted acordingly.
>
> Interesting. I've been running a Beeb off a PC Power supply for several
> years now (not continuously obviously), and have experienced no problems
> with that set up. It enables me to run all the disc drives and bits that
> I have attached all from the one psu, and not put any strain on the
> beeb.

Good plan! 
For interest:
              Master      BBC B
 +5 (5%)      900mA       1.25A
 -5 (10%)     75mA        75mA
 +12 (10%)    1A          1.25A

> > 11.3V is within 10% of 12V,so nothing to worry about there either,
>
> I did seach around and look through the Master
> service manuals but couldn't find any definitive figures for PSU voltage
> tolerances.

True, I've a feeling I got them from one of the internal coprocessor
manuals, or some such guide,
Sprow.