LISP 1.5 Programmer's Manual
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An implementation of interrupt handling facilities for LISP is described. Although simple and straightforward, the inclusion of these facilities into the language has been neglected. Thus LISP remains a second-generation language. The incorporation of PL/1-like on-conditions allows the user much greater control over the action of the LISP program, and enables him to trap conditions in data that would otherwise terminate the processor.