A CASE STUDY OF COMPUTER EMULATION

Through the design and construction of an emulator for DEC PDP-11 computers, the extent to which the Nanodata QM-f can serve as a universal host is being explored. The principal results show the extent to which emulation is possible without excessive sacrifices in speed. In addition to insights into the construction of a complete emulator, the paper identifies important problems associated with concurrent emulation of different target hardware, and describes solutions to some of them. RESUME Par le design et la construction d'un emulateur pour les ordinateurs PDP-11, les auteurs examinent la possibilite de se servir du Nanodata QM-1 comme hSte universel. Les resultats de l'etude indiquent jusqu'i quel point l'^mulation est possible sans trop sacrificier la rapidite. En plus des details sur la construction d'un emulateur complet, quelques uns des problemes importants associes a l'emulation simulantee de differents equipements sont identifies et des solutions propoSees. •