Re: A86: Re: DOWN+LEFT patch
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Re: A86: Re: DOWN+LEFT patch
At 16:58 1998-06-02 -0400, you wrote:
>Cool program. Well, makes my "patch" pretty useless ehh? I spent hours
>disassembling the ROM trying to figure out Port 3
>and I guess I failed miserably. No one answered any of my questions, I dont
>understand what exactly causes an ON interrupt
>(other then the ON key), and what exactly causes the down-left bug... I dont
>know why two bytes are sent before the interrupt handler ends...thats why I
>just tried duplicating the ROM interrupt handler and using the solution
>posted by Jimmy Mardell
>ealier.. but he never explained *exactly* what caused it in the first place
>so I tried to figure it out based on his code. I thought
>it was because some how the last two bits maybe interferred with the rrca's?
>But I thought that Jimmy's solution involved ignoring the ON key... guess I
>will do some more disassembling.. Damn it am I whining again?
I believe port 3 is used to "keep the calc alive" or something...
--
Real name: Jimmy Mårdell "can't go mucking with a 'void *'"
IRC......: Yarin // Apple's MPW C compiler
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