I have a few of these chips in my desk. I was building a slightly less ambitious 2 SN76489 synth using a Teensy LC as the brains. Some kind of wiring/soldering

I have a few of these chips in my desk. I was building a slightly less ambitious 2 SN76489 synth using a Teensy LC as the brains. Some kind of wiring/soldering snafu has me stymied though. Works fine on the breadboard but fails on the strip board