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ADC08 Intel 80186 Co-Processor (top)
ADC08 Intel 80186 Co-Processor (bottom)
The Master 512 (80186 co-processor) module with an Intel 80186 in the square central socket and 512K RAM. Acorn shipped this Co-Processor with the Master 128 as the Master 512 . It ran Digital Research's DOS+ and GEM (an early WIMP environment which predates Windows).