Motorola XM 501/701 swap compatibility?

Test Pattern Generator outputs a pattern into the monitor, allows you to test it's basic functionality while on your bench. Focus, image height \width, vertical and Horizontal hold can be adjusted but may need to be tweaked once the monitor is attached to the game board.
Beat me to my reply edit ;)
 
For testing the monitor you can get by with most composite video sources. I've used some of the cheap handheld battery operated video games. Still use an isolation transformer for power if tested on the bench.
 
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