A low-cost host processor for emulation research
Robert M. McClure · 1974
Microprogramming has now gained a certain amount of maturity and is a widely used technique in the design of computers. With only a few exceptions, such as QM-1 by Nanodata, and the D machine and B1700 of Burroughs, the choice of microprogrammed controls has been made on classic engineering grounds - simplicity and regularity of design, maintainability, flexibility, and cost - rather than to provide a flexible structure for research in microprogramming. For the most part, user microprogramming is reasonably limited to extensions along the same architectural lines as the natural virtual machine.