Of course, those of you who've been programming the last few years while I've
been vegetating probably don't even need to see the counts anymore. But if my
inbox is any indication, newbies are coming here all the time, so I thought
I'd add a comment to the code really quick.
Since there's a loop, it's probably a good idea to list the formula for the
cycle count in that place.
On Fri, 7 Nov 2003, Dennis Debro wrote:
> LF5A4: STA WSYNC ;
> SEC ;2
> ; let z = accumulator
> LF5A7: SBC #$0F ;
> BCS LF5A7 ; 5 * (z / 15) - 1
> EOR #$0F ;2
> ASL ;2
> ASL ;2
> ASL ;2
> ASL ;2
> ADC #$90 ;2
> ; cycle count is 13 + 5 * (z/15)
> STA RESP0,X ;4
> STA WSYNC ;3
> STA HMP0,X ;4
> RTS
This looks like a useful routine, and it's great to see more VCS archeology
going on.
--
Nick Bensema <nickb@xxxxxx> ICQ#2135445
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