Hi,
I'm not prepared to lay out $200 for these Xerox ROMs, but if I do manage
to get them, I'll read and share them. I did not know there were 5.0 ROMs
for the 820-II, but it appears there were, and they are included.
https://www.ebay.com/itm/184980603844
Mark
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Mark G. Thomas <Mark at Misty.com>, KC3DRE