Posted By
Crown
on 2005-10-03
10:17:16
|  Re: emulators bug
Yes that's what I meant too, that latching happens on write, it was just a little bit confusing the way I put it...
There was tough one test where the read out value changed after a while on a button press, sometimes it was enough to press one button sometime it needed more buttons pressed at one, but I need to investigate that further to see what is happening.
Back to the particular program, it should not work, beacuse it basically just loops on a $ff08 read, and its interrupt rutine calls the ROM keyboard handling directly. The ROM keyboard handling only writes $00 to $ff08 when it checks if there is any button pressed, and if one is pressed than it goes through the full keyboard scan, and the last written value to $ff08 and $fd30 is $ff, so basically it should never be able to detect a button press....
If this runs on a real hardware than thats something really strange...
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