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Takeda Toshiya has a basic uPD7801 disassembler on his page for the EPOCH Super Cassette Vision (which used a uPD7801G).


Sorry, so far no link to RA87 tools, but the AS assembler might be worth a try. It is well maintained (*1) and very well documented. It supports various NEC families including the 78C1x series, essentially the top end models of whats mentioned in your data book, which are (mostly) upward compatible with the 7800 (*2). If this doesn't fit your needs, maybe ...

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