- Messier 51 refers to the connected pair of galaxies known as Messier 51a (NGC 5194) and Messier 51b (NGC 5195). It is also known as the Whirlpool Galaxy although technically that name applies to Messier 51a rather than both.
- Undocumented 8086 instructions, explained by the microcode (righto.com)
What happens if you give the Intel 8086 processor an instruction that doesn’t exist? A modern microprocessor (80186 and later) will generate an exception, indicating that an illegal instruction was executed. However, early microprocessors didn’t include the circuitry to detect illegal instructions, since the chips didn’t have transistors to spare. Instead these processors would do something, but the results weren’t specified.
