Hacking the SjASMPlus Z80 assembler

I like SjASMPlus because it is small, portable (one exe, no install) and supports writing SNA format, which means it can directly assemble the source into SNA emulator snapshot file. This is very handy if disassembling a snapshot, reverse engineering the code, then comparing the compiled source with the original snapshot. However it has a minor drawback.

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