Date of Award

Fall 1981

Degree Type

Master's Essay - Restricted

Degree Name

Master of Science (MS)


Electrical and Computer Engineering


The report covers the design, implementation and test phases of an MOS Model 43 MAtrix Printer KSR terminal CONtroller (MACON). The circuit elements are P-channel enhancement mode MOS transistors, integrated in Monolithic form using a Teletype MOS process. The chip is A 40 pin DIP, and is classified as a VLSI. It serves as the central terminal and line control unit of the Model 43 Basic Key-board Send Receive set. It coordinates the activities of the Data Link, Operators Console (key-board) and Matrix Printer, which contains the character font. The on-chip logic is divided into two basic data paths which can operate independently of each other: The transmit (TD) and Receive (RD) data paths, which process information originating from the Operators Console and Data Link, respectively. The TD&RD processed data is eventually presented to the MAtrix Printer logic chip (MA.PL); however, TD data can be forwarded simultaneously to the Data Link. The VLSI MOS chip, under study, involved the following scientific disciplines: A. The marketing sector, which assessed a specific product in terms of its various features, cost, and manufacturing constraints (i.e., the model 43 terminal). B. R&D systems engineering sector which translated features into engineering specifications. C. R&D MOS logic design and topological layout team, of which the author is a member, converted the specifications into MOS logic and generated a final Application tape. D. Photolothographic translation of I/O tape into Mask Radicals. E. The Processing Sector which was involved with Wafer shaping, doping, etching, annealing. The real chip emerges from this organization. (See Appendix A and B). F. Testing and Parametric characterization. G. Dicing the wafer, bonding of I/O pads, and DIP insertion. H. Stress application by the Approving Lab sector. I. Manufacturing of the terminal . The result of the above contributions is a VLSI chip, that replaced a multitude of discrete SSI, MSI, and LSI packages, thus reducing dramatically the cost and the size of the KSD, and directly enhancing the reliability of the terminal in question. The Model 43 is presently one of the best selling peripherals manufactured by Teletype Corporation. As the technology evolves, the need for improvement becomes obvious. MACON and MAPL and the operator's console logic can be integrated today on a single chip, using N-channel depletion loads and double polysilicon self-aligned gate technology.