This group of instructions will rotate or shift the Accumulator and/or the In-Out Register. When the two registers operate combined, the In-Out Register is considered to be a 36 bit magnitude extension of the right end of the Accumulator.
Rotate is a non-arithmetic cyclic shift. That is, the two ends of the register are logically tied together and information is rotated as though the register were a ring.
Shift is an arithmetic operation and is in effect multiplication of the number in the register by 2+N, where N is the number of shifts. Shift or rotate instructions involving more than 33 steps can be used for simulating time delays. 36 rotate steps of the Accumulator will return all information to its original position.
Rotate Accumulator Right(13 usec. maximum for 36 shifts)
rar N Operation Code 671
This instruction will rotate the bits of the Accumulator right N positions, where N is octal digits 7-11 of the instructions word.
Rotate Accumulator Left(13 usec. maximum for 36 shifts)
ral N Operation Code 661
This instruction will rotate the bits of the Accumulator left N Positions, where N is octal digits 7-11 of the instruction word.
Shift Accumulator Right(13 usec. maximum for 36 shifts)
sar N Operation Code 675
This instruction will shift the contents of the Accumulator right N positions, where N is octal digits 7-11 of the instruction word.
Shift Accumulator Left(13 usec. maximum for 36 shifts)
sal N Operation Code 665