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Acorn AKA80 A540 RAMCard (front)
Acorn AKA80 A540 RAMCard (back)
The Acorn A540 and R260 were the only Acorn computers, before the RiscPC) designed to support more than 4MB RAM. Thay had a maximum of 16MB. This was achieved by having 4MB on the motherboard and upto 3 RAMCards with 4MB on each card. The cards also have MEMC1a chips which work with the MEMC1a on the motherboard as a master and 3 slaves.