Restoring a HP9830B calculator.

[MattisLind]

I think I need to show how the internals of the HP9830 look like so I made this composite image of all the boards inside. Aren't they beautiful?

Cards all gold-plated. Fantastic! This is pure quality!



First and second row is the memory subsystem with the DRAM memory board based on TMS4060 4k NMOS chips. Third row is the cassette and display interface. Fourth row is the actual CPU. Fifth row is the display and PSU. The only difference AFAIK between HP9830A and HP9830B is the memory board (second row left) and the memory address board (top left)