Date   : Thu, 16 Aug 2007 20:29:31 +0100
From   : julesrichardsonuk@... (Jules Richardson)
Subject: Acquired Beeb with symptoms...

Robert Schmidt-Cisternas wrote:
> I'm suspecting IC35 (the LM324N opamps)

Hmm, I just tried a known-good machine with the serial ULA (IC7) removed, and 
it operates fine without it. Now, all the circuitry to do with IC35 *only* 
interacts with the serial ULA - which suggests that if your machine's still 
causing problems with the serial ULA removed, then the problem lies elsewhere...

> Forgive my ignorance and inability to figure it out, but where's the
> UART?

Hmm, I think that's a 6850 chip... unfortunately on this machine I have it's 
not socketed (perhaps it is on yours).

cheers

Jules