The Archimedes was the first RISC home computer. There were three series, the 300, 400 and 500 which shared the same hardware basis: the ARM-2 processor (ARM-3 for the A500) and three custom chips dedicated to memory (MEMC), video (VIDC) and I/O (IOC) controls.
The ARM 2 RISC (8Mhz) had about 4 Mips, this means seven times faster than a Amiga 500 (68000 CPU)!
The 300 series had 512 KB to 1 MB of memory and two expansion slots (64 pin). The 400 series had 1 to 4 MB of memory and four slots (three 64 pin and one 96 pin). The 500 series had 16 MB of RAM.
The operating system, first named Arthur then subsequently RiscOS, was in ROM along with the WIMP graphic interface (Windows Menu Icon Pointer), the fast BBC BASIC V interpreter and various utility programs, among them a Paint package, a music editor and an Acorn BBC model 2 emulator.
The built-in 800 KB 3.5" floppy drive was compatible with the old 640 KB format. A lot of expansion cards were developed for the Archimedes : MIDI, SCSI, Oscilloscope, IEEE 488, speech recognition, scanner, floating point co-processor.
Many programming languages were released as well : BASIC (which could be loaded from disk and ran faster than the ROM BASIC), C, Fortran 77, Pascal, Prolog and Lisp.
Although it was at least two times faster than the Atari ST and Amiga models, the Archimedes had no real success because of its high price, except in its country of origin (Great Britain) where it was very well-known and commonly used (especially in schools).
These computers were followed by a great family of computers called RISC PC which are still in production.
Here are the different Archimedes A300 - A400 - A500 versions :
A305 - 512 KB RAM A310 - 1 MB RAM A410 - 1 MB RAM A420 - 2 MB RAM, 20 MB Hard disk A440 - 4 MB RAM, 40 MB Hard disk A540 - 16 MB RAM, 120 MB Hard Disk
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I am from Athens, Greece and I was the owner of an A3000 in the early 90s... the problem with Archimedes was the lack of support, outside the UK... the only thing I was able to find in Greece relative to my computer was "Archimedes Format"... no software, no hardware, nothing... also, I was the only Archimedes user I knew (not joking)
Hi I need help i have an A3000 and it works fine until i put either an arm610 card or the 486 pc card in the expansion slot on the back then it won''t turn on or light up and the psu makes a squealing noise if i then turn off and remnove card it works fine again i''ve tried different psu to no luck!!!
Friday 10th August 2018
Alex Wilkinson (United Kingdom)
Please note that the A310/1 system and A3000 systems mentioned in my 11 July 2012 post have gone to a good home - but I''ve still got 2 pre SVGA Phillips monitors as used with above machines, free to a good home, £10 UK delivery - same email as other post - Rob.