Wallstreet / PDQ Internal Modem Slot Pinout

[vacputer]

Greetings!

Does anyone have any information on the internal modem connector on the Wallstreet, PDQ, and early iMacs? It seems fairly clear that it has pins for 5v DC and UART(probably? Rockwell datasheets aren't easy to come by), but I can't find much else on the topic that can't be (non-destructively) derived from the modem card itself.

 

[Trash80toHP_Mini]

The Modem/PCI Communications Slot (CSII) pinout is in the 6300/6400 DevNote. Find the WS/PDQ Developer Note and try looking look there?

 

[vacputer]

I gave it a look, and it seems that neither the Wallstreet nor the iMac DevNotes have any good information on it. The Wallstreet note does mention the slot a few times, indicating it functions as a serial port and is connected to the secondary Heathrow I/O IC, but offers no specifics beyond that.

Thank you very much regardless- This is far more than I had at the get-go!