.Markku Reunanen.

Panasonic JR-200 simple reset button

September 10th, 2014

A memory-preserving reset button can be useful for a developer, cracker or a cheating gamer, too. Got my hands finally on the Service Manual, and based on p. 29 it was easy to make a – hopefully – safe reset button. You could ground the processor /HALT pin directly, but this one is safer, as the signal goes through two inverters and there’s a capacitor to filter the noise caused by lousy buttons (like mine). See here:

First find the capacitor and diode (D1) at the top right corner of the mobo. Solder a wire to the back leg of the diode, add a button and connect the other leg of the button to the ground. For example the screws holding the mobo in place are grounded, so you can tighten the wire under one of them.

Filed under: laitteet,retro