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tfr1
2019 Mar 25
2
Overlapping register groups in old 8-bit MC6809 processor.
Hi
I'm returning to my MC6809 back-end from a health-related hiatus. The assembler is tantalisingly close, but I've got some parsing and matching problems.
The register set; these overlap in annoying ways, for instance, two instructions TFR and EXG each have a single opcode, and the post-byte specifies which registers are to be involved, but the registers can be 8- or 16-bit, and 2 of