instruction that atomically shifts the bits in a
value one position to the right, setting the most
significant bit to 0 and moving the least significant bit
into carry. Useful in implementing a linear feedback shift register
Don't forget to add 2 cycles to modes other than impl, as those modes are read-modify-write.
Similar: ASL | ROL | ROR | INC | DEC
See also: 6502 instructions | 6502 addressing modes