Total Repair

[Harald]

(07-21-2017 03:43 PM)PANAMATIK Wrote:  Of course the Classic calculators and HP-67 can be included in the list of candidates. However no magnetic card reader supported.

AFAIK you have done already a replacement board for the classic calculators. However I would recommend the original display drivers to be removed, they are not necessary and consume too much power and would thwart the Low Power concept less than 0.2mA in Sleep Mode. Although your concept proposal would need less wires for doing the replacement.

Bernhard

I agree that the original display drivers are not very helpful at all if you are aiming at low power. Standby as you have implemented it now won't be possible. Unless the controller had a way of shutting the display drivers down.
But the advantage of simply dropping in the replacement board without any soldering is huge in my opinion. I guess most people would be scared away by the amount of soldering involved.