Chosen NON-programmable scientific calculator is clone of CASIO fx-82ms:
![](https://cdn.hackaday.io/images/2792181509342900114.jpg)
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:
![](https://cdn.hackaday.io/images/7019561509344433257.jpg)
In this particular model a keyboard circuit is located on transparent flexible "board":
![](https://cdn.hackaday.io/images/7485471509344722587.jpg)
![](https://cdn.hackaday.io/images/9577231509344774671.jpg)
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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