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.
My first computer job was programming a PDP-11 which ran a Casio emulator. Our PDP-11 was mounted very low beneath a floppy drive cabinet, and each morning the elderly programmer would lie on the dusty floor to toggle in the boot sequence which then loaded from paper tape. When that became my job, I somehow figured that if the toggles were left at the first address, then hitting the start key would allow the core memory to take over. Everyone was convinced that I was a computer genius.