Re: A86: Re: Port 4?


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Re: A86: Re: Port 4?




I think you're right about that one.  That darned "Turbo" thing everyone
talks about on the 82/83.  They think it will speed up the calc or give them
better key response.  Why they don't just disable interrupts and use the
ports is beyond me...

-----Original Message-----
From: Dux Gregis <assets@eden.rutgers.edu>
To: assembly-86@lists.ticalc.org <assembly-86@lists.ticalc.org>
Date: Sunday, November 29, 1998 7:01 PM
Subject: Re: A86: Re: Port 4?


>
>
>I think that it might set the interrupt speed from the documentations I
have
>seen on other calculators.
>
>
>>
>>That wouldn't be the hardware reset, would it?  I've heard that when the
>>calc first starts up after a battery-pull, there is a short piece of
>>code near or at the beginning of the ROM that resets everything... ?
>>
>>
>>> ... In fact, the first
>>> two instructions the rom executes are <ld a,$57 \ out (4),a>.  It has
>>> something to do with the hardware, but no one except Pat knows.  You'd
>have
>>> to ask him.