Hello! Jim Brain wrote: > Not to take this too far off topic, but I would be interested in an idea > that would allow the ROM areas to be "banked" in such a way that you > could fit 16kB of KERNAL or BASIC into a 8kB space. I know the trivial > is to use a "secret" location, but that's too simplistic. I was > thinking of something where a sequence of address accesses would trip > the bank, and then if there was an IRQ when in the wrong bank, any > access to the normal locations would "trip" it back by writing to a > single location. That way, accesses to ROM routines would incur no more > than a few cycles to flip back to the correct bank. 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. Regards, Michau. Message was sent through the cbm-hackers mailing listReceived on 2013-05-25 22:00:05
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