RISC Single Chip

The RISC Single Chip, or RSC, is a single-chip microprocessor developed and fabricated by International Business Machines (IBM).

Unlike the POWER1, the RSC does not have register renaming capability due to a limited die area in which the unit must fit in.

To further save die area, the floating point multiply-add array is 32 bits wide.

To perform 64-bit (double-precision) operations, the operands are broken into two, and the instruction passes twice through the multiply-add array.

The memory interface unit manages the bus and performs ECC checks on data coming into the processor.