Suggestions on HP21 restoration

[Marcovecchio]

Thanks for the heads up on Panamatik's kit, but if I understand it correctly, the bubble led display is needed, but my HP21 has no LEDs anymore, someone else removed it. I have only the housing and keys, nothing else.. well, the original PCBs are there, but all corroded by battery leakage.

Regarding precision, thanks again, I didn't know about this! It seems I have another problem to solve, in addition to the limited key functions.

By the way, back to Panamatik's kit: it emulates several models in a Woodstock calculator. But how does it deal with different keyboards? Are the markings just ignored, and the emulation gives each key the function based on key position on the layout? That's it?

Other than that, I can't see how to emulate an HP34c on a HP25.