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more groking of why memory-based ASL, DEC, INC, LSR, ROL and ROR take what they take

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James Tauber 2011-08-14 21:50:55 -04:00
parent 12671d81cb
commit e2211e4189
1 changed files with 4 additions and 2 deletions
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6
cycle_notes.txt
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@ -50,8 +50,10 @@ zero page, x 6
absolute 6
absolute, x 7
Note 3: looks like class I +2 (with the absolute, x +1 even if not page
crossing)
Note 3: these take 2 cycles longer than Class I because they involve a
read-modify-write. Because the absolute, x is a write to an indexed
non-zero-page memory location, there is an additional +1 even if not page
crossing (see Note 2)
Class IIIa