Re: A86: interrupts and on key
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Re: A86: interrupts and on key
There are 2 bits in port 3 you need to be concerned with, one (bit 0 I
think) tells if an on-interupt has occured, and the other (bit 3) tells
if on is actually being pressed. Down-left only affects the first one.
Joshua J Seagoe wrote:
>
> down&left as well as any key in the bottom row combined with the key
> above it triggers the on interrupt and sets the bit in port 3. (at least
> it seems that way) i've tried checking port 1 for the other key, which
> sorta works, but it seems that it still wants me to tell it that i've
> taken care of the on key
>
> -josh
>
> On Wed, 17 Feb 1999 14:40:09 EST ComAsYuAre@aol.com writes:
> >
> >you detect an on press from port 3, whereas if you want to detect down
> >and
> >left (not sure why you want that, but i guess maybe there's a reason),
> >then
> >you use port 1. the only way that down+left [probably] triggers an
> >on
> >interrupt is in the system im 1 interrupt.
> >
> >
>
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