We had a PDP 11/4 with core memory that ran a TruDrill CNC PCB drill. The bootloader was in ROM and if the core memory became corrupt you had to reload it wit

We had a PDP 11/4 with core memory that ran a TruDrill CNC PCB drill. The bootloader was in ROM and if the core memory became corrupt you had to reload it with the same paper tape reader that read the G-code.