Z80 emulation: My modification to Z80 Instruction Exerciser (Zexall/Zexdoc)

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My modification to Z80 Instruction Exerciser (Zexall/ /Zexdoc)

As I made my way through the Zexdoc tests, it became a problem waiting for the early tests to complete before it got to the test I was interested in. Not having had any luck in finding a macro assembler to that would successfully re-assemble Zexdoc, I wrote an assembler routine to modify the Zexdoc machine code. It changed the Zexdoc code so that, at start-up, it shows a list of the 67 tests and then asks the user to select one. Below is a screenshot of how the modified Zexdoc looks at start-up.