9 pin Apple mini din connector at the end of the peripheral cable, from the front of the connector.
The back panel of all Power Macintosh models contain two I/O ports for serial telecommunication data.
GeoPort was a serial data system used on some models of the Apple Macintosh. GeoPort modified the “meaning” of the existing Mac serial port pins to add a new high-speed DMA channel that allowed the Mac”s internal sound hardware to emulate various devices such as modems and fax machines. GeoPort could be found on late-model m68k-based machines (the AV series) as well as all pre-USB Power Macintosh models.
|1||SCLK (out)||Reset pod or get pod attention|
|2||Sync (in)/SCLK (in)||Serial clock from pod (up to 920 Kbit/sec.)|
|7||Wake up/TxHS||Wake up CPU or do DMA handshake|
|9||+5V||Power to pod (350 mA maximum)|