...and enter the 8-bit baby. Not much soldering done today, but I've got the ISP connector and a dual power up and running. I.e. the cartridge runs whether it's connected to the C64, or the STK board.
No, it's not photoshopped.
For some reason, I chose the world's brightest LED as a power indicator. I must admit I regret it already.
Power: off, finally. Bluetooth and ISP connected.
Next up is wiring A0..A14, D0..D7 and CE, and we're good to go for another test. Stay tuned!