The RiscPC (stylised with a half-space as Risc PC, also referred to as Risc PC and codenamed Medusa) was Acorn Computers's next generation RISC OS/Acorn RISC Machine computer, launched on 15 April 1994, which superseded the Acorn Archimedes. The Acorn PC card and software allows PC compatible software to be run.Like the Archimedes, the RiscPC continued the practice of having the RISC OS operating system in a ROM module.