>>Try this. Frames, seconds, minutes, and hours count down instead of up.
>>You can deal with this later. Days count up.
>
>A problem with this clock is that it counts seconds, minutes and hours in
>hex and this means a conversion to BCD in case you want to display it.
So simply store the numbers in BCD and use the 6502's BCD-math flag to
process them. I did this for the scores in my invaders game. It takes one
byte per field (frames, seconds, minutes, hours, days) in either hex or
BCD.
Simply put a SED at the beginning and a CLD at the end of the routine I
posted, and change the #60 to #$60 and #24 to #$24.
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