Lowest level (sometimes called Level 0, L0) triggers are fundamental components in high energy physics experiments, and yet they are quite often custom-made. Even when using FPGAs to achieve better flexibility in modifying and maintaining, small changes require hardware reconfiguration and changes to the algorithm logic could be constrained by the hardware. For these reasons we are developing for the NA62 experiment at CERN a L0-trigger based on the use of a PC and commodity FPGA development board.