Ancient and slow but still works great for these old boards. Both of these were amongst the best $20 I ever spent. Tektronics 2465A OScope for repetitive stuff, HP 1631D logic analyzer/digital scope for watching goesinas and goesoutas to see which are working or not working. Learn to use these and a meter and you can fix most anything of this old slow stuff. Old 9010A - died long ago, I've got some old 9010A pods here somewhere. *If* I can find them, you can have them.
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For those asking about the 9010A pods. I had two --> Motorola 68000 and Intel 8051(8751). I used the 8751 a lot but never used the 68000 (which had broken pins and should be repairable). I have not seen these in several years and am still tearing my test equipment cabinet apart. Keeping fingers crossed...

Anybody ever use a Tektronix P6407 word recognizer probe? I found one of these in my cabinet and have no idea how to use it.

Guy in next office near me has one of those cheapie USB logic analyzers. I was rather surprised at how well it worked. And it weighs just a tad less than that 1631D.