Just out of curiosity, what are you using this board for? The IBM 5150
uses at least three different mother boards, 16K, 256k, and I *think*
512K soldered in RAM. Each is expandable to 640K with 3rd sourced RAM
boards.
I should have (somewhere) at least one of each. I also have several 5150
complete units including keyboard (not so sure about the monitors.)
Marvin
  Message: 3
 Date: Fri, 29 Mar 2024 20:04:52 +0000
 From: Just Kant <kantexplain(a)protonmail.com>
 Subject: [cctalk] Re: need a 5150 motherboard
 To: "General Discussion: On-Topic and Off-Topic Posts"
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 If you're willing to ship, I'll offer 30$ total. But it has to be IBM.
 Sent with Proton Mail secure email.
 I have one at Kennett Classic for sale, I think it's $20. I believe it's
 an original IBM, but it may be a close clone. Untested.
 b