Halt and Catch Fire

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Halt and Catch Fire is a generic name for undocumented and semi-mythical machine language instructions with destructive side effects, according to popular urban legends present in many well-known systems. from IBM System / 360.

The Motorola 6800 was the first processor whose "machine language" ("machine language") "HCF" became widely known. This instruction causes the processor to enter factory test mode - it continually reads the memory contents of subsequent cells without executing any commands. In this configuration, the address bus starts behaving like a counter, allowing you to quickly verify that all address lines are working correctly. According to unconfirmed information, in some situations execution of this command on certain computer systems will damage the chips that support the address bus because of a conflict. Examples Assembler halt: keeps jmp halt C for (;;) { asm (HLT)

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