the M4 board was recently made open source hardware https://github.com/M4Duke/m4hardware so now you can order the PCBs from your favorite PCB maker and solder it yourself, or even have it made.
Took my sweet time creating a cable for this thing to work with the Commodore 1950 multisync monitor I have, sorry about the delay. so finally I tested it, works OK, positive feedback left
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