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Questions tagged [microcode]

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15
votes
2answers
1k views

6502 branch offset calculation

This question expands on How does the 6502 implement its branch instructions? I'm working on a cycle accurate VHDL implementation on an FPGA. I have much of the program logic already written, but I ...
6
votes
2answers
2k views

Was the IBM 5100 ever used for codebreaking?

There's a rumor that there's something embedded in the IBM 5100 which makes it useful for codebreaking. What is the legitimacy of that claim?
23
votes
5answers
5k views

How was microcode implemented in retro processors?

How was microcode implemented in retro processors such as the Z80 or 8080? Was the microcode standard (for example a manual for the processor outlining all possible micro-instructions and the ...