When the Chameleon v2 is inserted into the expansion slot of my C64C, it (almost always) refuses to boot. After about 50 power-cycles, and many reinstertions of the cartridge, the C64C booted successfully with the Chameleon inserted only once. No other accessories are connected. The power LED of the C64C turns on, but the screen remains black, or sometimes displays a white screen. The LEDs on the Chameleon remain off. The power supply is a T40/E with 1.7 A on 5 V and 1 A on 9 V.
Both the C64C and the Chameleon always boot successfully when disconnected. I have noticed that the C64C on a few occasions displays a grayscale image, suggesting that its CT1 trimmer capacitor near the VIC may need to be replaced. Is the Chameleon sensitive to CT1 deviations?
Finally, it would be useful to forward keyboard commands via the IEC connector (from a C64 keyboard) or the ChaCo USB connector (from a PC keyboard), as an option, and not only the PS/2 connector. The amount of electronic waste can be reduced by not requiring a PS/2 keyboard, just for the Chameleon.