Throughout the history of producing CNC Machines, Fadal had 5 versions of the CPU board. Each version can be identified by a dash number. The very first machine (VMC45) was compatible with 1400-1 board as well as the first few VMC40s. Similarly, the second-generation control board was the 1400-2 and each new revision was added as new INTEL microprocessors became available. https://itscnc.com/circuit-boards/pcb-0030.html