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IFEL RISC OS 3 ROM Carrier
The Archimedes A300 was designed to take 1 Mbit ROMs, unlike the A440 and later A400/1 which could take 4 Mbit ROMs. The A300 required an carrier board so that it could be upgraded to RISC OS 3. Several 3rd parties produced carrier boards, this one was made by IFEL.