@yestergearpc there was an Englishman on the Spectrum for Everyone Facebook group selling kits of 4116 testers. I think they might be on Tindie still.
@kelpana just finished going one step further lol. Works great. Uses AT PSU.
@yestergearpc you won't run out of power at least! 😊
@yestergearpc sometimes you just need to throw things together on the breadboard. My latest creation for the C64! Needs further testing.