Original post was as follows:
Anyone have the pinout for the iMac revs A/B mezzanine/perch slot? Or any other mezzanine slot info? I Googled ’til my eyes bled but found nothing other than references to the Game Wizard and Formac’s scsi adapter.
I have the crazy notion to add a PCcard cage, arguably the most useful of all upgrade slots short of an actual PCI slot.
I am new to this site and tried to reply to this post, but it was too old. I do indeed have the pinouts to the mezzanine connector (or at least the better part of half of them. The story is that this connector was electrically identical to the personality slot on some earlier Macs. The difference is that the pin count was off bya bout 16 or so pins. I was able to get my hand on a IProRaid TV card (by Formac) and get the specs for some of the chips on the board. By using a continutiy tester, I was able to reverse engineer the connector to the chips. The problem is that the chips only utilized the lower 32 bits of the PCI format. The connector will support a full 64 bit PCI connection if you can figure out the remaining pins. I never had much luck beyond this point. What I do have is a decent (albeit hardcopy) documentation of the pinouts with enough detail that one should be able to construct a 32 bit PCI card for this slot. I have the part numbers needed for the connector as well. The caveat is that some of the crucial pins for the Device select and interupt are questionable (but marked as such). It is a decent start for the brave. I will try to dig this info up from my archives and package it.