TWO_SPEED_CLOCK_Circuit Diagram World 
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2017-01-08 23:18  
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Creates alternative slow clock cycle for MOS Technology 6502 processor on KIM-1 microcomputer card under eontrol of SPEED SELECT line generated by slow memories. Control logic of 0 gives fast cycles, while logic 1 gives slow cycles. Processor cycle is maintained for 1 ps for fast memory access, but cycle is automatically stretched to 2μs for slower 2102s.-Y. M. Gupta, True Confessions: How I Relate to KIM, BYTE, Aug. 1976, p 41-48.