The T42 Transputer in FPGA is a full binary-code compatible opensource VHDL implementation of the Inmos IMS-T425 32bit microprocessor.

Our T42 open-source Transputer-in-FPGA is a full binary-code compatible design to the Inmos IMS-T425 32bit version of the Transputer. Our self-developed microcode will cover the full instruction set. Any still available Transputer software should run. Support of many cores in FPGA was intended from the beginning and quite a large number of interlinked T42 cores can be loaded on suitable sized FPGA boards. For external memory extension state-of-the-art DDR-SDRAM can be connected to the T42 core. Therefore all initial design targets have been achieved.