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I don't think you have shown any evidence for your hypothesis. Even if you knew something about the processor you would have a complete lack of tools for doing anything with it.popy said:This calculator has these ICs:
CPU: Hitachi HD62002A03 at 1.228 MHz
RAM: 32 KB (external chip)
ROM: 32 KB (external chip). Optional: expansion pack of 32 KB.
LCD drivers: 2 x HD66100F (I have the datasheet: lcd driver with 80 channels/outs).
Probably the interpreter of BASIC is integrated in the CPU... and in the external ROM only the software libraries...