I've thought about it for a little bit and realized that the open connectors are going to need terminators.
Otherwise, the signals will bounce off the "open" connection and echo back into itself, confusing the daylights out of it.
Soooooo the choice is either to use a DE-9 port for the input, with a mini-DIN-8 adaptor, or the reverse. Or I can provide both, but with a switch to select input from either the mini-DIN-8 or the DE-9 connector. Or I can provide terminators, either external (sound like a great thing to loose) or internal, selected by a switch.
Either way, it should be very much possible.
On my official (appears to be) PhoneNET adaptor, I fiddled with the ohmmeter to try to figure out the "black box". Assuming it's in the format of a transformer, I probed the "secondary" "side" and found a resistance of 1.4Ω. On the "primary" "side", the two outer pins have NC to each other, but #1 will have intermittent connection with #2 before it cuts out. #3 has an intermittent connection with #4, before it also cuts out. #2 to #3 has an ohm reading of 1.4Ω, suggesting to me that it is most likely a 1:1 transformer. But I don't understand the relationship between #1 and #2, #3 and #4 as stated.
On my TurboNET ST, I imagined (probably correctly, probably incorrect) likewise. This one had a reading of 1.0 for the "primary side" and 0.9Ω for the "secondary side". The "shield connections" to the board (they're soldered through and appears to be doubling as a jumper" has a ohm reading of 0.7Ω.
Otherwise, the signals will bounce off the "open" connection and echo back into itself, confusing the daylights out of it.
Soooooo the choice is either to use a DE-9 port for the input, with a mini-DIN-8 adaptor, or the reverse. Or I can provide both, but with a switch to select input from either the mini-DIN-8 or the DE-9 connector. Or I can provide terminators, either external (sound like a great thing to loose) or internal, selected by a switch.
Either way, it should be very much possible.
On my official (appears to be) PhoneNET adaptor, I fiddled with the ohmmeter to try to figure out the "black box". Assuming it's in the format of a transformer, I probed the "secondary" "side" and found a resistance of 1.4Ω. On the "primary" "side", the two outer pins have NC to each other, but #1 will have intermittent connection with #2 before it cuts out. #3 has an intermittent connection with #4, before it also cuts out. #2 to #3 has an ohm reading of 1.4Ω, suggesting to me that it is most likely a 1:1 transformer. But I don't understand the relationship between #1 and #2, #3 and #4 as stated.
On my TurboNET ST, I imagined (probably correctly, probably incorrect) likewise. This one had a reading of 1.0 for the "primary side" and 0.9Ω for the "secondary side". The "shield connections" to the board (they're soldered through and appears to be doubling as a jumper" has a ohm reading of 0.7Ω.