The Dauug | 36 open-source minicomputer for critical infrastructure is the world’s most advanced transparently functioning, fully auditable, user-constructable controller or minicomputer for critical infrastructure. The world’s first computer designed for decades of Internet-connected use without need for a single security patch. Also the first modern architecture (e.g., paged virtual memory, preemptive multitasking, hundreds of opcodes, millions of instructions per second) in decades that contains no purchased complex logic. There isn’t a single microprocessor or anything like one (FPGA, PLD, or ASIC) anywhere in the design.