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Aleph One
http://www.aleph1.co.uk/
Aleph One are a registered Acorn developer, best known for producing x86 second processor cards.
PC Card Information
http://acorn.cybervillage.co.uk/pccard/
Information from the Acorn Cybervillage.
PC Card Upgrades
http://www.chiark.greenend.org.uk/~theom/riscos/pccardug.html
DIY 486 to 586 for Risc PC issue I 486SX co-processor cards.