There can be more than one program with the desire to send control commands to the I/O subsystem at one time. As these commands must be serialized before being passed through the serial interface to the microcontroller board, there is a process doing just that.
A definition for the protocol used between the microcontroller board and the Game Control Computer exists as GCC.PB-B03
Functional description
The iocd is started at boot time and listens on loopback port 3236/tcp for connections from programs sending commands to the I/O subsystem. It also has the serial interface (/dev/cuaaN) opened for reading and writing. Commands that are received on the loopback ports are forwarded to the serial port in a serialized way. Logging capabilities for development and debugging purposes are included.
For incoming data from the I/O subsystem, iocd also listens on connections on port 3237/tcp. Incoming data will be read from the serial port and multiplexed to all connections to this port.
Usage information
/usr/local/pinball/iocd [-f] -d[debug-level]
-f
Do not detach and become a daemon, run in foreground. Used for debugging.
Default value: not set
-d [debug-level]
Set the given debug level. Valid debug level range is 0 (least messages) to 7 (most messages).
Default value: 0
CategoryComputer CategoryPinball
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