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- 21:30, 17 June 2026 Josh talk contribs uploaded File:Acorn Risc PC 600 motherboard.jpg (Acorn Risc PC 600 motherboard (board 0197,000): the two CPU-card sockets and RISC OS ROMs (left), IOMD, VIDC20, VRAM and DRAM SIMM sockets, on-board IDE/floppy connectors and the backplane socket. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)