Pinout for PowerBook modem with 8-pin connector ?

[register]

Inside a PowerBook 180 I found an "Apple PowerBook 14.4 Modem Card" #820-0365-B, ©1993. The card has an 8-pin mini-DIN style connector. The connector looks just like the two other serial port connectors a stock PowerBook 180 sports. Up till now I only knew the usual Western phone line connectors to connect PowerBook modems. Could someone provide a pinout and a hint what device to connect to this 8-pin connector, please?

 

[wally]

Not which pins, but some background info that might apply if that modem is the international version...

http://www.mail-archive.com/duolist@themacintoshguy.com/msg00406.html

 

[Bunsen]

Yup. Basically useless without the dongle, which all seem to have gone the way of left socks

 

[register]

Thank you for the information. The dongle seems to be made just from two specific connectors with a given wiring scheme (no special electronics necessary). As it seems, the same modem card was made in different flavours just by using different connectors on the pcb, probably with some specific connections regarding to different telephone device specifications. Someone even managed to convert a mini-8 type into a RJ11 type, as mentioned here. If someone has not lost the 8-pin modem dongle, could he or she probably take the time to measure the electric connections and set up a description? A mini 8-pin to RJ11 wiring scheme would be nice, but any localised version should do, as information about national telecommunications standards should be available.

 

[Bunsen]

One wonders ...

Does the Powerbook modem connect internally to a pseudo-serial port, or a pseudo comms slot, or a pseudo PDS, or what?

 

[register]

Does the Powerbook modem connect internally to a pseudo-serial port, or a pseudo comms slot, or a pseudo PDS, or what?

The internal modem connector shares the connection with one serial port. In case of a PowerBook 180 with two separate external serial ports you have to choose to either keep both external serial ports operational or to use the internal modem. To use the internal modem renders one external serial port useless.
In a PB 520 with just one external serial port one has to choose between using it as a Modem/Printer port or as a LocalTalk port. The second serial port lives hidden inside the PowerBook and waits for a modem card to become useful. As the serial port of this machine has a tendency to die sooner than the rest of the machine it would be a nice hack to make the serial port connector for the internal modem available as a standard serial port.

 

[Bunsen]

Mmyes, it would