Gregory's Server@kenshirriff Are more details coming? The part labeled FPU is surprisingly small compared to the parts labeled data path (control). How much was microcoded?
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@kenshirriff Are more details coming? The part labeled FPU is surprisingly small compared to the parts labeled data path (control). How much was microcoded? 1 comment
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@nh I'm not planning to look at the 486 in detail. The FPU is controlled by a "sequencer PLA" for basic operations, with complex operations using the same microcode ROM as the integer operations. I'm not sure why the integer datapath is so much larger than the floating point datapath, maybe the numerous integer registers and the barrel shifter.