The AXPpci33, aka NoName, is based on a reference design called EB66. It uses the 21066 processor running at 166MHz or 233MHz. Any other 21066-based motherboards on the market are also based on EB66 - there's really not many system options when designing a 21066 system, because all the control is done on-chip. The EB66 schematic was published as a marketing poster advertising the 21066 as "the first microprocessor in the world with embedded PCI" (for the trivia fans: there are actually 2 versions of this poster - I drew the circuits and wrote the spiel for the first version, and some Americans mauled the spiel for the second version (NIH!))
Most of the 21064 systems are now 21064A systems. There are 3 or 4 motherboard designs around (I'm not including Digital systems here) and they are all based on a reference design called EB64+. These designs use a support chipset called '21071' (aka APECs) which is 6, 208-pin chips (4, 32-bit data slices, 1 system controller, 1 PCI controller). This provides a DRAM controller (128-bit memory bus) and a PCI interface. It also does all the work to maintain memory coherence when a PCI device DMAs into (or out of) memory. Both AT and BabyAT form-factors exist. The boards I can think of include:
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