Ralf Brown's Interrupt List (RBIL) is a comprehensive list of interrupts, calls, hooks, interfaces, data structures, memory and port addresses, and processor opcodes for x86 machines from the very start of the PC era in 1981 up into the year 2000, most of it still applying to PCs. The project is the result of the research and collaborative effort of hundreds of contributors worldwide over many years, and is maintained by Ralf Brown, a researcher at Carnegie Mellon University's Language Technologies Institute.