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25 lines
883 B
Text
25 lines
883 B
Text
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focal (FOCAL language interpreter)
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FOCAL is an interactive interpreted programming language based on JOSS
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and mostly used on DEC PDP series machines. It is an ancestor of (or
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at least an influence on) the BASIC language. For more information on
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FOCAL, see: https://en.wikipedia.org/wiki/FOCAL_(programming_language)
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This implementation is by Dave Conroy and Akira KIDA. It comes from Eric
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Raymond and John Cowan's Retrocomputing Museum:
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http://www.catb.org/retro/
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See /usr/doc/focal-$VERSION/focal_doc.txt for the language
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specification. See /usr/share/focal for sample code. Loading and
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running a FOCAL program is done like so:
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$ focal
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*lib call program.foc
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*g
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Enter "quit" at the * prompt to exit.
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There is a small archive of FOCAL programs available here:
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ftp://ftp.pdp8.net/software/games/focal/
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...although not all of them are compatible with this version of FOCAL.
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