Xerox 820/II 8/16 Prom/Eproms ( Masters ) on e-bay

Tom Uban tom at
Wed Aug 11 09:37:24 CDT 2021

I have a Xerox 820. I don't know how to tell if it is a -II or not. It is marked as U05-013264
September 1984. It powers on and boots the monitor. Looking at the PROMs, they are labeled:
U33 5.0, U34 5.0, U35 5.0, U36 5.0, U37 4.01, U38 4.01

At some point, I need to ask someone to make me bootable 8" floppies, but I suppose I need to
determine if it is 820 or 820-II first...

At least some of the ROMs appear to be available here (along with other info):


On 8/11/21 9:04 AM, Mark G Thomas via cctalk wrote:
> 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.
> Mark

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