SHAOSChosen NON-programmable scientific calculator is clone of CASIO fx-82ms:
While original CASIO fx-82ms costs $12 (see here), "noname" clone is available for $7.99 (see here).
Inside of the calculator we see a small green PCB with on-board chip under black compound:
In this particular model a keyboard circuit is located on transparent flexible "board":
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Looking forward on how this turns out. I have several older calculators that might fit the bill :-)
Are you sure? yes | no
Yes, almost any calc could be turned into "progammable" by that way that I'm planning
Are you sure? yes | no