3 ms·

Is 8086 microcode reverse engineered or released today for studying?

• Taniwha 6y ago
  probably not, but the data from this project should make that pretty easy However to be useful you need to know what each of those 21-bits is connected to, some will essentially be risc-like uCode instructions, the others will be tied to particular functions in the CPU or memory interface
• deleted 6y ago
  [deleted]
• kiwidrew 6y ago
  Not yet, but with these new high-resolution die photos it is only a matter of time. Meanwhile the US4449184 patent [1] referenced in the post's footnotes has a lot of information about how the microcode works (and the meaning of the 21 instruction bits) and, in Tables 7-12, shows the microcode listings for some of the microcoded 8086 instructions. [1] https://patents.google.com/patent/US4449184 https://patents.google.com/patent/US4449184