Date   : Fri, 20 Mar 1998 09:56:40 +0000 (GMT)
From   : Chris Johns <cmjohnj@...>
Subject: Re: Wierd Hardware Problem!

On Thu, 19 Mar 1998, Stuart William McConnachie wrote:

> part no UF25C.  Can't remember which one the system one was, there were
> 2 in the Beeb one above and one below the 6502 processor.  Maybe someone
> else can help you there.

IIRC the one to the left of the CPU (by the FDC or FDC socket) is the 
system one, the one below the 6502 is the user one. The machine will work
without the user one, but needs the system the system VIA, so you can try 
swapping the two 6522s over.

> BREAK works because this is connected directly to the system reset line.
> I assume the single beep you get when you power up is a function of the
> sound chip powering up?

>From what I understand, and this may well be wront, the "burrrrrrrrr" bit is 
the sound chip before its gets initialised, I think the "beep" is when the OS
initialises the sound system, and does a VDU7.
-- 
dyw genes...

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