New DRUMULATOR at the workshop & FNIRSI 1014D

A few days ago, I posted here a search request of a living or dead Drumulator.

I just received a machine that no longer works. It seems normal to me given all the tinkering she has undergone. After some investigations and component changes, I was able to see that the processor is working properly.

In red, the IC sockets that I changed, in yellow, the changed components, the CTC and a decoding circuit for the display (for the moment I have not changed the decoding circuit because I have to find a 74LS145 that I don't own).

At the moment I do not know if other circuits are defective. I don't know if everything related to the sound generation works but it is not very important. I just want to use this Drumulator board to test my digital FPGA implementation of this sound generator. I just need the D / A conversion and audio output part.

I have said it before, and although not sponsored by FNIRSI, it is a real pleasure to work with the 1014D oscilloscope. The screen is super nice, for frequencies of a few MHz it is fast enough and above all, it does not make any noise and is super light to move on the workbench. It is really very practical for this kind of little troubleshooting.