* serial RS232 connector
* USB connector (used for FPGA and flash memory updates)
== CPC TREX starter ==
[[Image:trexstarter.gif|thumb|320px|CPC TREX start menu]]
The CPC TREX starter written by [[Prodatron]] is needed for booting the CPC TREX machine. Automatically after switching on the TREX it is started together with a special [[SymbOS]] version, which has been adapted for the native mode of the CPC TREX. It allows the selection of the favourite CPC type, ROM configuration and DSK files. The starter menu will load the files into the memory and switches to the Clone CPC (4MHz) or Turbo CPC (24MHz). To change a disc again, it is possible to go back to the menu and choose other DSK or even ROM files.
== Web links ==