The final addition to Acorn' s Archimedes family of personal computers, released in April 1994. The RiscPC allowed a second processor, e.g. an Intel 486 or a second ARM, to share the bus, memory and peripherals with the main processor. It also had full 24-bit colour graphics support. The Risc PC 600 (the first to be launched) had the new ARM600processor and RISC OS 3.5. The RiscPC 700 had an ARM710processor and RISC OS 3.6, and the SA had the StrongARMprocessor and RISC OS 3.7. Castle Technology Ltd later introduced the IYONIX pc with the 32-bit X-Scaleprocessor and USB sockets. USB and StrongArm can also be retrofitted to earlier RiscPCs. RiscPCs are among the most energy efficient home computers. {Acorn Computer Museum (http://pages.zoom.co.uk/acorn.computer/riscpc.html)}. (2004-09-21)