Gordon Matheson. User microprogrammability in the HP-21MX minicomputer. In J. Michael Galey, C. V. Ramamoorthy, editors, Conference record of the 7th annual workshop on Microprogramming, MICRO 1974, Palo Alto, California, USA, September 30 - October 2, 1974. pages 168-177, ACM, 1974. [doi]
Abstract is missing.