Subject: Re: [stella] Does this look right? (clock) From: emooney@xxxxxxxxxxxxxxxx (Erik Mooney) Date: Thu, 02 Oct 1997 16:41:35 GMT |
>>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. -- Archives updated once/day at http://www.biglist.com/lists/stella/archives/ Unsubscribing and other info at http://www.biglist.com/lists/stella/stella.html
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