Microprograms are carefully designed and optimized for the fastest possible execution, as a slow microprogram would result in a slow machine instruction and degraded performance for related application programs that use such instructions.
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To provide different classes of machines, each computer in the family would use more or less hardware emulation, and more or less microprogram emulation, to create a machine able to run the full S / 360 instruction set.
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Microprogramming also reduces the cost of field changes to correct defects ( bugs ) in the processor; a bug can often be fixed by replacing a portion of the microprogram rather than by changes being made to hardware logic and wiring.
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His initial implementation consisted of a pair of matrices : the first one generated signals in the manner of the Whirlwind control store, while the second matrix selected which row of signals ( the microprogram instruction word, so to speak ) to invoke on the next cycle.
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Internally the MCP-1600 was a ( relatively fast ) 8-bit processor that could be micro-programmed to emulate a 16-bit CPU . Up to four MICROMs were supported, but usually two or three could hold the needed microprogram for a processor.
26.
Because of its close relationship to the underlying architecture, " microcode has several properties that make it difficult to generate using a compiler . " A simulator program is intended to execute the bits in the same way as the electronics, and allows much more freedom to debug the microprogram.
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