Very big batteries! Haha

Now really I have no idea, I gave the monitor to my dad, a ham radio enthusiast. All his stuff was tagged with similar cryptic notes, only he could understand.

Your comment on writing down the freq made me chuckle… I did the same! For some odd reason I still have that old CRT…

No doubt the hardest was the first one. I recall it was slackware with kernel 2.x around the late 90s. Having to recompile the kernel and configure manually the scan line freq for the monitor made it challenging. Ah yes, the man pages I printed them at work, that was all I had access to. No internet.