Report Number: CS-TR-71-197
Institution: Stanford University, Department of Computer Science
Title: MIX/360 user's guide
Author: Knuth, Donald E.
Author: Sites, Richard L.
Date: March 1971
Abstract: MIX/360 is an assembler and simulator for the hypothetical MIX machine, which is described for example in Knuth's $\underline{The Art of Computer Programming}$, Section 1.3.1. The system contains several debugging aids to help program construction and verification.
http://i.stanford.edu/pub/cstr/reports/cs/tr/71/197/CS-TR-71-197.pdf