>excuse me, but the only unconditional "branch" that takes 3 cycles is JMP
>absolute, and it takes 3 cycles regardless of the contents of the
>operand...perhaps you were referring to BRA or branch always? or maybe
>something else...
BRA?
There is no BRA in the 6507 architecture. Only
BCC,BCS,BNE,BEQ,BPL,BMI,BVC,and BVS.
All should be 2 cycles if the branch is not taken.
LDA NotZero
BEQ Back
NextStuff:
Not taking the branch will only take 2 cycles. No modification of the PC
occurs, save for its increment.
Always be sure to check that page boundary condition, tho. I had some
issues with that in PG2.
-John K. Harvey
--
Archives (includes files) at http://www.biglist.com/lists/stella/archives/
Unsub & more at http://www.biglist.com/lists/stella/
