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The ZIP file attached to this article contains details on the expansion card inferface implimented on the Acorn Archimedes, R-Series, BBC A3000 computer systems and the Acorn Risc PC. The majority of the document is also relevent to the A4000 and the later A30xx machines that can be fitted with internal expansion cards (known as mini expansion cards).
For more details on the RISC OS software interface with expansion cards, and how to write loaders for them, see Expansion Cards and Extesnion ROMS in Part 13 of the RISC OS 3 Programmer's Reference Manual