HP11C calculator (1981) might be the oldest. I occasionally use it for a quick calc just because.
HP16C of similar vintage also.
edit: And an HP71B (1984) which is definitely programmable (assembly and BASIC; I don't have the FORTH module).
HP16C of similar vintage also.
edit: And an HP71B (1984) which is definitely programmable (assembly and BASIC; I don't have the FORTH module).
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