[Dr_Jefyll]

Sorry about the TLDR situation; it's on my list to revise the article by prepending an abstract. BTW suggestions and questions about the article are welcome.

@mjhall - you're quite right; the strange, phantom 65c02 operations dramatically expanded what I could do with this project. It's extremely cooperative of the CPU to generate a memory address while leaving all registers unchanged! Although it's true I could've used the PROM to map NOPs onto CMP or BIT instructions and gotten my addresses that way, that approach preserves the registers but still stomps the Flags. In contrast, the "LDD" operations are ideal for the job -- an opportunity handed to me on a silver platter!

-- Jeff