Risc PC was a range of personal computers launched in 1994 by Acorn, replacing the Archimedes series.

CPU technology advanced rapidly in this period though and within only two years a DEC StrongARM could be installed at 233MHz which was around 8 times faster.

Applications from both operating systems could run at the same time in a similar fashion to a virtual machine with data shared between them.

The Risc PC had a novel case design where additional chassis, known as "slices", could be stacked on top of each other, expanding the height of the machine.

Acorn discontinued production of the Risc PC in 1998 after a corporate reorganisation but Castle Technology continued manufacturing the machines until 2003 and subsequently then produced their own similar designs.

Only two prototypes were ever built, and one was publicly displayed for historical interest at the RISC OS 2001 show in Berkshire, England.

Significantly better performance has been reached on the aged Risc PC design by using the newer 203 (and later 236) MHz StrongARM CPU, using third-party video cards, overclocking, and having specially-designed CPU cards with RAM located upon them to sidestep the speed bottleneck of the slow system bus.