Given this paragraph about computers, what is the first RISC system?

Michael J. Flynn views the first RISC system as the IBM 801 design,[2] begun in 1975 by John Cocke and completed in 1980. The 801 developed out of an effort to build a 24-bit high-speed processor to use as the basis for a digital telephone switch. To reach their goal of switching 1 million calls per hour (300 per second) they calculated that the CPU required performance on the order of 12 million instructions per second (MIPS),[8] compared to their fastest mainframe machine of the time, the 370/168, which performed at 3.5 MIPS.[9]

The first RISC system was the IBM 801, started in 1975 and completed in 1980.