The 6800's HCF (Halt and Catch Fire) opcode is another famous example. https://x86.fr/investigating-the-halt-and-catch-fire-instruction-on-motorola-6800/ https

The 6800's HCF (Halt and Catch Fire) opcode is another famous example. https://x86.fr/investigating-the-halt-and-catch-fire-instruction-on-motorola-6800/ https://x86.fr/investigating-the-halt-and-catch-fire-instruc...