Hi Ken,
Before going farther, can you briefly describe the problems you have that have led you to a search for a replacement board? I only ask because, with some Macs, seemingly insurmountable problems can turn out to be small ones when the community here throws their experience at it. Worth a shot.
I can also safely predict that someone will join in with the statement that a working P200 is not resellable for the cost of a replacement logic board. Although that is true, some of us keep old Macs running for the fun and learning experience; price is secondary. My point is, if you are like me and enjoy tinkering, ignore the "it ain't worth it" responses that often show up in threads like this
"Nuff said--on to finding parts!
There are two on-line resellers who always seem to end up with parts for older Macs.
Sun Remarketing has a P200 logic board listed for US$50.
Shreve Systems has a lot of parts but I did not see anything on their web site tonight. Might be worth a call or e-mail to check.
FWIW, I've never done business with either firm so cannot vouch for their credibility as venders. Both have been around a long time, so that's a good thing in their favor.
Tip: When web-searching for used/pulled boards, keep in mind that Mac boards are more commonly called "logic boards;" the term "motherboard" is used more for Dark Side machines. Using
logic board as the search term should point to more Mac parts.
The best of luck in your search.
Allan