Hp-70 incorrect key registering

[Geoff Quickfall]

No, not a ram problem, just lots of info on the chip set.

How about corrosion on the motherboard?

How did the 70 mother board work in the 45 keyboard?

Inspect the mother board, especially around the chip set solder points and traces. Resolder the chip set especially around the ROMs. A motherboard wash/rinse with warm vinegar followed by water then anhydrous alcohol. Inspect the traces. Test when dry.

Geoff