The DE9 versions of the phone net adapters are slightly more difficult to find, and more expensive than the minidin8 ones. Just of the top of my head, adapting the minidin8 to DE9 should be entirely passive, since it should be the same signals.

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Yeah, there's one on eBay for $13, while you can have three of the DIN-8 ones for $7. Does anyone know a part number for the 8 pin Mini-Din socket? Unless I can get another spare I'd probably rather make an adapter cable than the more obvious expedient of cutting the cable off the transceiver.

I was thinking I should have most of the parts I'd need for the CapNet thing out in the garage, but I'm sort of nervous about being the first one to try mixing it with commercial Phonenet dongles for obvious reasons. (Although it sounds like the RS-422 drivers in the Mac *should* be pretty tolerant of even hard shorts I don't really want to test just how tolerant, particularly after 30 years.)