Eric finds the root cause of our vexing PS/2 intermittent problem and repairs the motherboard for good. PS/2 repair playlist:    • IBM PS/2 Model 77   Our sponsors - PCBWay: fast turn PCBs, https://www.pcbway.com/ - Keysight: test instruments: https://www.keysight.com/ - Samtec: connectors: https://www.samtec.com/ Support the team on Patreon: https://www.patreon.com/curiousmarc Buy shirts on Teespring: https://teespring.com/stores/curiousmarcs-store Learn more on the companion site: https://www.curiousmarc.com/ Contact info: null