Thank you all for the fast responses. The headphone/external speaker idea was great and obvious in hindsight. That removes the one annoying detail of needing to reinstall the motherboard in the case after each interim repair.
Other posts here, including this recent one from Sunday have the next...
The posts here are very helpful, thank you for all the topics over the past few years.
In the process of restoring my //si from 1990. My main question is:
What is the minimum needed to test the motherboard?
The objective is to get an indication that refurbishing the board was successful with...