Pulldowns on the right signals and a MAX232 transceiver did the trick! Thanks again, everyone!

Thanks all for the warm welcome and quick replies!


Also, in case you're not connecting /DSR, /DCD, & /CTS lines anywhere (e. g. if you're probing your UART with a logic analyzer, or using USB-UART converter), you should tie them low, otherwise they will prevent you from sending/receiving the data ...

Introduction
As with many others, I got started playing with the 6502 after watching Ben Eater's series of videos. I quickly became frustrated with all of the wires and flakiness of a breadboard and decided to design a simple PCB to continue exploring the 6502. During research for my PCB design ...