Pinouts of Connectors

Apple GeoPort connector pinout

layout
schematic diagram
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The back panel of all Power Macintosh models contain two I/O ports for serial telecommunication data.

9 pin Apple mini din connector pin-out & layout
9 pin Apple mini din connector  at the end of the peripheral cable, from the front of the connector
Both sockets accept 9-pin plugs, allowing either port to be independently programmed for asynchronous or synchronous communication formats up to 9600 bps. This includes AppleTalk and the full range of Apple GeoPort protocols.
Pin Signal Description
1SCLK (out) Reset pod or get pod attention 
2Sync (in)/SCLK (in) Serial clock from pod (up to 920 Kbit/sec.) 
3TxD- Transmit - 
4Gnd/shield Ground 
5RxD- Receive - 
6TxD+ Transmit + 
7Wake up/TxHS Wake up CPU or do DMA handshake 
8RxD+ Receive + 
9+5V Power to pod (350 mA maximum) 

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Pinouts.ru > Pinouts of serial ports >  Pinout of Apple GeoPort connector and layout of 9 pin Apple mini din connector

Source(s): Apple "Ports and Pinouts"
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