Abstract

Many APL systems, especially mainframe systems, have made it inconvenient or impossible for users to write subroutines in machine-oriented languages (e.g., FORTRAN, C, or assembler). This deficiency has had a serious impact on APL, preventing it from competing with conventional compiled languages for speed and access to hardware capabilities. The trend in modern APL systems, particularly microcomputer systems, is to provide more convenient and flexible access to machine-oriented programs. This paper describes the machine-level interfaces provided by several APL systems, lists desirable features of such interfaces, gives examples of what machine-oriented programs can be used for, and takes a speculative look at the future.

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