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I detached the #Plus4 keyboard to test the power LED with a battery: it works.

I cleaned the contacts with isopropyl and plugged the flat cable back on the board and now... IT WORKS! 🎉

Was it just an oxidized contact? I'm not sure.

Anyway, the tuner video signal is very noisy. I wrote this short program to test sound output.

First time I play with the BASIC V3.5 multimedia commands, and it's awesome! :commodore:

#commodore #retrocomputing #vintagecomputing