Date   : Fri, 17 Aug 2007 12:49:23 +0100
From   : fragula@... (Fragula)
Subject: Acquired Beeb with symptoms...

ISTR there is a *FX/OSBYTE for this, to turn on/off the ADC scanning (0)
or 1,2,3,4  set the number of channels scanned and how often (25/50/100
times per second.)

This runs on IRQs, but whether the ADC is the source of the IRQs is
another matter.. Might be derived from the system VIA.

Oh My, It /has/ been a long time. <sigh>

Cheers!

M.



Alex Taylor wrote:

>On 17/08/07, Jules Richardson <julesrichardsonuk@...> wrote:
>
>  
>
>>See, that is strange. I'm not quite sure why removing the ADC would partially
>>fix it, as the ADC doesn't appear to generate interrupts anyway - it's purely
>>polled by the system.
>>    
>>
>
>I'm not sure how different the hardware is, but I clearly remember
>that adding a Plus 1 to an Acorn Electron slows it down, because of
>the ADC. IIRC, the documentation gives a poke to turn it off if you
>don't need it, which speeds the machine back up again.
>
>  
>