Re: BASIC and System ROM replacements

From: Segher Boessenkool <>
Date: Sun, 26 May 2013 10:05:30 +0200
Message-Id: <>
> How would you like to return to the previous ROM bank upon exit  
> from the
> interrupt handler? You can't detect a RTI instruction because the 6510
> doesn't have the SYNC pin.

It's the only way to get four back-to-back reads from the
stack (well, unless you are running code from stack memory).
Pretty complex though (esp. if you figure in RDY and DMA,
and not completely reliable as mentioned ;-)


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Received on 2013-05-26 18:01:01

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