(Commonly, but incorrectly, known as the "PC-RT", later

changed to just "RT") IBM's first RISC-based Unix

computer. The RT-PC was the predecessor to IBM's RS/6000.

It ran AIX 1.x and 2.x and had a PC-AT bus and IBM's

ROMP microprocessor. It was withdrawn from the marketing

around 1989 or 1990.