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CONVENTIONAL AND MICROPROGRAM
INTERNAL PROCESSOR CONTROL
MICROPROGRAM CONTROL OF MAIN STORAGE
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adder additional address field associated bit position check bits check logic circuitry clock code word components control fields control logic control memory control primitives control sequence control signals control store CSAR current microinstruction cycle daisy chain data bus data register data word decoder outputs device controller DMA device duplicated Electronic Switching System encoded error detection failure rate fault detection fault diagnosis FETCH flip-flop function hardcore hardware I/O bus implementation interrupt request least-significant bit logic gates machine macroinstruction opcode main memory main storage maintenance memory bus memory control unit microcode microcontrol sequence microdiagnostic microin microprogram control microprogram memory microprogram sequence module MTBF MTTF number of bits occur operand parity bit parity-check bit performed peripheral device processor processor register redundancy reliability repair selected self-checking sequence of microinstructions shown in Figure software bugs specified standby struction switching technique tion XOR gate