A four bit microprocessor’s layout was drawn on an Apollo workstation using MOSIS two lambda design rules. The layout’s operation was verified by breadboarding with 74’00 HCMOS logic parts during Spring Quarter 1990 by Theodore D’Antonoli. Based on his findings, the layout was revised and several design changes were added. At the same time, a software simulation program (uPROSIM) for the processor was written in FORTRAN on the RIT VMS Computer System.
Chen, Hsiao-Hui Miguel
"Design of a 4-Bit Microprocessor,"
Journal of the Microelectronic Engineering Conference: Vol. 5
, Article 3.
Available at: https://scholarworks.rit.edu/ritamec/vol5/iss1/3