Abstract
The growing acceptance of user-microprogrammable computers indicates that microprogramming, as a discipline, will require development of user-oriented microprogramming support. A number of approaches (definition of sophisticated target machines, microcode assemblers, and higher level microprogramming languages) have been proposed. The issues involved in choosing support tools include the range of proposed applications, hardware parallelism (horizental or minimally encoded control vs. vertically encoded control) and constraints on performance. After reviewing some of these tradeoffs, design considerations for higher level microprogramming languages are considered. One of the most important design decisions is fixing the level of the language, defined on a continuum from symbolic assemblers, through general purpose programming languages such as PL/I. A tailored language concept is defined and illustrated, using as an example a microprogramming language for a horizontally encoded microprogrammable computer currently under development.
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