On Tue, 14 Sep 1999, Pete Holland wrote:
>Does ROR, when it rotates the bits, rotate them all, or does it just
>move them over and, any bits at the end, just dump them? It seems like
>ASL and LSR do the later, and I can't image redundant commands in
>computer programming, but I just want to make sure.
ROL rotates the memory/accumulator and Carry left one bit, in a circle:
.--------------------------.
`-- C <- 7 6 5 4 3 2 1 0 <-'
ROR, right one bit in a circle:
.--------------------------.
`-> C -> 7 6 5 4 3 2 1 0 --'
ASL shifts memory/accumulator left one bit, sets bit 0 to 0, and moves the
former bit 7 to Carry:
C <- 7 6 5 4 3 2 1 0 <- #0
LSR shifts memory/accumulator right one bit, sets bit 7 to 0, and moves
the former bit 0 to Carry:
#0 -> 7 6 5 4 3 2 1 0 -> C
Matthew W. Miller -- mattm@xxxxxxxxxxx
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