HP67 - can be programmed but then does not work

[teenix]

(04-17-2022 12:24 AM)Marcovecchio Wrote:  Tony, while on this subject: what are the options once we conclude one of the hp67 ROMs is faulty?

Is there any solution on replacing all 4 ROMs, for example, with a microcontroller that would emulate the ROM chips?

Or the only current choices are to replace with a good ROM from another hp67? Or, of course, substitute all internals with your replacement board, or use Panamatik's solutions?

Thanks!

This could all be done, it just takes time. The main problem is getting IC's these days, they are becoming hard to find with the global IC shortage continuing. Most delivery dates just for what I need are "sometime" next year. Even if they become available, bigger companies have probably snapped them up.

cheers

Tony