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Guy Harris (talk | contribs) →Microcode: The VAX 9000 IBox appears to be hardwired. |
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* Store the result value in register 8
* Update the condition codes from the ALU status flags (''negative'', ''zero'', ''overflow'', and ''carry'')
* Microjump to a given [[program counter|
To simultaneously control all processor's features in one cycle, the microinstruction is often wider than 50 bits; e.g., 128 bits on a [[IBM System/360 Model 85|360/85]] with an emulator feature. 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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