The only things I recognise is the Boxford power supply and the gemini controller, and maybe that 10.1 disco light is a voltage controller. The motion controller board - ???? Presumably the USB connection just provides 5v for the optos and the rest is a standard LPT connector that you infer is run by a USB to Parallel adapter (UMMMM).

Anything printed o the board in pic 2 ?

Fairly recent conversion, judging by the Wago connectors.

Did you see it working before you bought it ? That is the pivot point as to where to look.

Cheers,

Rob