How does Interrupt Vector help in identifying the source of interrupt?

MMIX is a 64-bit RISC abstract machine designed by Donald Knuth, with significant contributions by John L. Hennessy (who designed the MIPS chip) and Dick Sites (who was the architect of the DEC Alpha chip). Knuth will be using MMIX in all future editions of his The Art of Computer Programming (TAoCP) to illustrate machine-level aspects of programming, especially in relation to the analysis of algorithms. It is pronounced "emmix."