I've completed the device, it works fine. However, I'm not sure how to connect the pins of the JST connector to the DIN6. In my case, pin 1 is black, and I soldered it to the first left pin of the DIN (when viewed from the soldering side). The cable (red) from pin 2 of the JST, I soldered to the next DIN pin, and so on until pin 6 (green), which I soldered to the central pin of the DIN connector. Unfortunately, the C64 cannot recognize the connected device, so I suspect there might be something wrong with my soldering scheme. Can anyone advise me on this?
That's the IEC Serial port, not the User-port. The User-port is the wide one on the far left on the C64. The one which was usually used for Modems back in the days, or WiFi modems nowadays. I am sure you already know this and are just brain farting all over the place. But there are newer generations of C64 users out there, who are confused enough as it is with these old relics. - Yeah, and by that, I guess I mean both us and the C64s 😅