Guns, as an engine

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Possible Answers: REVS.

Last seen on: LA Times Crossword 4 Jun 2018, Monday

Random information on the term “REVS”:

Acornsoft LISP (marketed simply as LISP) is a dialect and commercial implementation of the Lisp programming language, released in the early 1980s for the 8-bit Acorn Atom, BBC Micro and Acorn Electron computers.

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Acornsoft LISP was released on cassette, disk and ROM cartridge. The ROM cartridge version had instantaneous loading as well as a greater amount of available free RAM for user definitions.

In contrast with large-scale LISP implementations, Acornsoft’s variant only had a modest number of built-in definitions as it had to fit in the limited memory space of the 8-bit Acorn computers.

The interpreter was implemented in 6502 machine-code and was 5.5K in size. It was based on Owl LISP written by Mike Gardner of Owl Computers, which he published for the Apple II in 1979. Acornsoft licensed it from Owl Computers in 1981 and developed it for the Acorn Atom and BBC Microcomputer.

The supplied LISP workspace image containing commonly used built-in functions and constants was 3K in size, although this could be deleted if not needed by the user to free up more memory.

REVS on Wikipedia