Apple Macintosh RS-232 and other serial ports and interfaces pinouts listing

• Apple GeoPort pinout The back panel of all Power Macintosh models contain two I/O ports for serial telecommunication data.
• Apple Macintosh RS-422 pinout It´s possible to connect RS-232 peripheral to the RS-422 port available on Macintosh computers. Use RXD- as RXD, TXD- as TXD, Ground RXD+, Leave TXD+ unconnected, GPi as CD.
• Apple Macintosh Serial pinout This connector is present on Macintosh 128K, 512K, and 512K enhanced.
• Apple Macintosh XL Serial A pinout 
• Apple Macintosh XL Serial B pinout 
• AppleLine RS232 pinout