Date   : Mon, 08 May 2006 22:31:58 +0100
From   : Jules Richardson <julesrichardsonuk@...>
Subject: Re: More fun with DFS, TUBE, yada yada

Joel Rowbottom wrote:
> Hi chaps --
> 
> Right, i've got a bit further and worked out I had three (!) busted 
> 7438s in my junkpile.

Hmm, I've had more than one 7438 just die on me too...

> I picked up some time back a 6502 2nd processor and a Z80 2nd processor. 
> The 6502 one doesn't have the PSU with it but I've tested it running 
> from one of the +5 rails in the Beeb although I suspect this isn't 
> recommended :P 

Without being near to one of my machines to check, I seem to remember that 
Torch did exactly that with their Z80 copros (Acorn wanted you to buy in to 
their cheese-wedge concept I suppose)

I'd expect you're fairly close to the PSU limit though; I think personally - 
what with the machines getting a little old and tired - I'd always use an 
external PSU where possible.

If you're near Cambridge I think I have a spare compact +5V/12V PSU kicking 
around - I'm not back in the UK until next month though. Local freecycle list 
will certainly get you a scrap PC to pull a power supply from, at least! :)

cheers

Jules