According to the developer note, the Wallstreet's right expansion bay connector can be configured to provide direct access to its PCI bus. However, to the best of my knowledge (and Google's search ability), no company ever made products that took advantage of this feature. Has anyone here heard of devices that did?
The reason I ask is that the pinouts for 32-bit 33MHz standard PCI slots and the PowerBook's connector look agonizingly similar -- the PB implementation lacks 3 of the interrupt lines (there's only one expansion device, so that shouldn't be a problem), both the PRSNT lines (also shouldn't be an issue, presence detection is handled through other means), and the power management event line. Since I have spare EBM connectors, PCI connectors, and lots of time, I'd like to determine whether an EBM-to-PCI expansion slot adapter could be built.
Another consideration is the fact that most PCI cards won't fit directly into the expansion bay (there's only 5.25" available in there). Since the PCI bus doesn't use termination, the trace length could be an issue. On the other hand, desktop logic boards often have PCI buses longer than this. Does anyone think the trace length would cause issues if the signal layers were sandwiched between ground layers on the PCB?