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Yeah, we're still kickin around, here and there.  ;)   I regret not keeping a lot of my old Mac stuff (II, IIsi, IIfx, quadra 700, 840AV, etc).  Sigh.  I should start collecting again.  I still have a bunch of of old MAcWorld demo disks and MacOS CD's and such.

I can see there is some price history floating around on the internet/eBay, and it seems to be worth anywhere from $25 to $40.  I'd let it go for like $10-15 I guess, or maybe less if that's not reasonable.  I don't have a use for this anymore, someone else may as well enjoy it.

Awesome!!  I'll have a look at that thread.

Also, this may be useful: https://html.alldatasheet.com/html-pdf/4166/MOTOROLA/MC68851/258/1/MC68851.html Oddly enough, all the signals are not accounted for on the PDS adaptor, some are missing, most notably the bus control signals (DS/RW/DSACK, etc)

Also, this may be helpful  :) https://html.alldatasheet.com/html-pdf/4166/MOTOROLA/MC68851/258/1/MC68851.html

If this is still an active project, I may be able to provide some help (I was a Mac nerd a long time ago, used to have all these chips memorized)  I also have a II Daystar adaptor like the one above if you need it for testing or parts.  The diagram is labeled wrong, that's a MC68851 not a...

I realize this is a thread necro, but if anyone is interested, I have one of these mythical PDS adaptors, albeit for the Macintosh II.  It is different (and maybe rarer?) than the IIx one, as it pulls data and signal from the MC68851 PMMU memory management unit as well as the MC68020 CPU to work...