Its possible that the "power good" signal would be delayed enough to compensate for the capacitor charge time. Equally its also possible that the initial surge would simply shut down the PSU altogether preventing a power up at all !
Pretty sure that display was fed internally by a mere 12 Volts.
I still have my "Hi Res" (for the day) Ball, green phosphor, monochrome 720x350 Hercules type display and I run it from a 12V dongle or even a 9V battery all the time.
The heater and the anode are the biggest loads. I'd bet that the XT integrated display does not get fed 120 VAC, so there would be no issue with parking heads, etc.. You would have time.
The place for the UPS is EXTERNAL to the PC. This thread is lame, because just like 63/37 solder, we scientists figured out the best way a long time ago.
The UPS is a separate entity from the computer. Dopes that try to build better mouse traps should be better at choosing what mouse traps need improvement first.
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