67 is flakey

[teenix]

(10-11-2023 04:14 PM)mbielman Wrote:  Hi John,

1) I thought those from Teenix were blank boards?
2) I saw 2 67 "parts" units on epay this last week, but when bids reached $200 I said "WHOA!"

Cheers!

The blank boards are copies of the original HP circuit boards and the included gerber files can be sent to a PCB manufacturer to make a replacement.

Th others are fully working replacement CPU boards for 55 65 67 97 and Spice. Hopefully 19C soon.

Parts are available again so I've been able to restock since the pandemic.

The described error could be a faulty RAM register at address 62 ($3E).

Great care should be undertaken when trying to remove the ICs. Apart from unintended static damage, the plastic/ceramic cases may be cracked or brittle with age and can break easily in some cases. This will definitely cause a grimace or two, it did for me on a HP-92 :-(


cheers

Tony