How can I find Diagram of Serial port?

[The_MHNS]

Could you show me diagram of serial port of Dreamcast?

[ptr.exe]

This schematic for a coders cable from DevCast may be of some use:

http://devcast.dcemulation.com/mods/codercable/serial.gif

source (http://devcast.dcemulation.com/mods/codercable/codercable.php)