Risc PC
Medusa) was Acorn Computers Ltd's next generation RISC OS/Acorn RISC Machine computer, which superseded the Acorn Archimedes.
Like the Archimedes, the Risc PC continued the practice of having the RISC OS operating system in a ROM module. RiscPC augmented the ROM-based core OS with a disk-based directory structure containing configuration information, and some applications which had previously been kept in ROM.
Specifications and technical details
Memory type: SIMM, 2 slots, supporting a maximum memory size of 256 MB.
Video subsystem: VIDC20 controller, with optional dual-port VRAM up to 2 MB.
Expansion: Eurocard-sized HD15 VGA, network (optional).
CPU: Dual-processor slots, accepting the following chips on a special daughterboard: ARM6 at 30 MHz or 33 MHz, ARM7 at 40 MHz, StrongARM at 203 MHz, 233 MHz or 300 MHz+. 486 and 586-based co-processors at up to 133 MHz, and DSP chips (third party) were also available.
Milestones
1994 - RiscPC 600 launched, featuring a 30 MHz ARM6 CPU.
1995 - ARM7 CPU upgrade and RiscPC 700 model launched.
1996 - StrongARM CPU upgrade released, offering a fivefold increase in raw processing power compared to the ARM7 used in the previous high-end machines.
2001 - Viewfinder PCI to Podule adapter allows the use of PC graphics cards.
RiscPC 2
Acorn set about designing the Risc PC 2 - a design with a 64 MHz front side bus, PCI slots, and a yellow-coloured NLX form-factor case. Slated for release in late 1998, the project was canned just before completion.
RiscPC today
Variants of the Risc PC design are still sold today, but Risc PCs have reached the end of their production cycle with the advent of RISC OS computers based around the XScale ARM processor and PCI bus (namely the Iyonix PC). Second-hand Risc PCs command very high prices relative to PCs of similar age and specifications. Significantly better performance has been pulled out of the aged Risc PC design by using the newer 302 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.
Limitations
The front side bus is usually recognised as being the most significant fault of the computer; and the arrival of the (five times faster) StrongARM processor in 1996 meant that the Risc PC had a CPU vastly faster than that for which the computer had been designed. Acorn had originally expected ARM CPUs to progress from the 30 MHz ARM6 to the 40 MHz ARM7, and then onto the ARM8 cores, which at the time were clocked at around 50-80 MHz.
See also
