Glossary

Filter:
# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
H
H
Hat
HCF
HD
HDM
Hex
HF
HLL
Hog
HOL
Hop
HSM
HUS
Hz
HCF
  • Mnemonic for `Halt and Catch Fire', any of several undocumented and semi-mythical machine instructions with destructive side-effects, supposedly included for test purposes on several well-known architectures going as far back as the IBM 360. The MC6800 microprocessor was the first for which an HCF opcode became widely known. This instruction caused the processor to toggle a subset of the bus lines as rapidly as it could; in some configurations this could actually cause lines to burn up.