MIME: An Educational Microprogrammable Minicomputer Emulator

Abstract

Abstract-This paper discusses the design and fabrication of MIME, a low-cost microprogrammable, general purpose computer specifically configured for use in an educational environment. In order to have utility as an instructional aid in the areas of computer control and microprogramming, such a machine must have the following high level attributes: educationally oriented human interface, educationally oriented design, and user microprogrammability. These attributes were employed as a basis for deriving functional and detail requirements.The AM 2900 bipolar microprocessor family was used as the basis for realizing the design which satisfied the defimed requirements. The resulting hardware and software is being employed at the Air Force Institute of Technology by students in computer engineering classes and associated laboratories to investigate microprogramming and its application to emulation. The paper also presents, through the development of this processor, an excellent example of top-down design.

CASM (Central's Assembly SiMulator): The Advantages of Using a Simulator to Teach Assembly Language

“…Full-fledged development environments cater to professional programmers instead of students. Other simulators are often most concerned with microprogramming (1,2,6,8,10), or overly complicated, though realistic machines (3,7). None have syntax checking editors built into the system like CASM.…”

An experimental interface of a microcomputer with a Vega Universal Testing Machine to retrieve data on test specimens

“…One of the most powerful and flexible techniques to emerge from the continuing evolution in digital technology has been microprogrammed computer control. Academic interest in this technique results from its widespread commercial adoptions and its potential for simplifying program solutions and giving equipment flexibility to meet changing requirements (Purvis et al, 1981). Also, the rapid growth of microprocessors has created a need for university-level microprocessor courses with supporting laboratory facilities.…”

“…(3) the computer and the interfacing components should be off-theshelf items and inexpensive (Purvis et al, 1981).…”

“…Microprogramming has become an important facet in understanding and utilizing current digital technology (Purvis et al, 1981). However, some of the major drawbacks of existing computer systems are due to the lack of support for the software life-cycle and the unnecessary restriction on the use of tools (Kuo, 1983).…”

“…Academic interest in this technique results from its widespread commercial adoption and its potential for simplifying program solutions and giving equipment flexibility to meet changing requirements (Purvis et al, 1981). Authoring language can make computer-based instruction more efficient (Passmore et al, 1984).…”