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I'm trying to identify RICOH RF5A93 uC
Ricoh did both 6502 and 65816 CPUs. In your case I would check WDC 65C816 for more details.
Eberhard H. wrote in post #8022637: > Ricoh did both 6502 and 65816 CPUs. > In your case I would check WDC 65C816 for more details. Unfortunately both CPUs use 6502 opcodes, so I'd expect 0xA9 (LDA) or 0x4C (JMP) would be some of the most popular hex codes