unprogrammable HP 25

[PANAMATIK]

(07-23-2021 02:18 PM)Dave Britten Wrote:  I'd probably start with something quick and easy: clean off and reflow the solder on the RAM chip on the off chance that you get lucky and it's just a cold/cracked joint. Also inspect the board for any broken or corroded traces leading to the chip.

If all fails, the HP-25A ACT chip will restore the RAM function.

Bernhard