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ALGOL 68S
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<h2 id="implementations">Implementations</h2> <p>A compiler for ALGOL 68S was available for the <a href="/facts/PDP-11/9HkGUzFn">PDP-11</a>, written in the language <a href="/facts/BLISS/xm2Msp6c">BLISS</a>. The multiprocessor version designed for the <a href="/facts/C.mmp/1YtX3NJl">C.mmp</a><a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> has been preserved at the PDP Unix Preservation Society archive.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> </p><p><a href="/facts/Charles_H._Lindsey/1tu7krTS">Charles H. Lindsey</a> created another implementation of ALGOL 68, named ALGOL 68S, for <a href="/facts/Sun-3/G6kAvXgK">Sun-3</a>, Sun <a href="/facts/SPARC/m7KhEtET">SPARC</a> (under <a href="/facts/SunOS/oWMcGLqc">SunOS</a> 4.1), Sun SPARC (under <a href="/facts/Solaris_(operating_system)/KPfT98EJ">Solaris</a> 2), <a href="/facts/Atari_ST/9GsYSlaM">Atari ST</a> (under <a href="/facts/Atari_ST/9GsYSlaM">GEMDOS</a>) and <a href="/facts/Acorn_Archimedes/BxInoqjT">Acorn Archimedes</a> (under <a href="/facts/RISC_OS/Pc96teso">RISC OS</a>). </p> <h2 id="chief-differences-from-algol-68">Chief differences from ALGOL 68</h2> <p>The main differences between ALGOL 68 and 68S, as summarised from Appendix 4 of the Informal Introduction,<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> include: </p> <ul><li>No <i>union</i></li> <li>No <i>flex</i>, but <i>string</i>s are handled specially</li> <li>No arrays inside structures (but references to arrays were allowed) and a similar restriction on arrays of arrays (multidimensional arrays are nonetheless permitted)</li> <li>Limits on use of <i>long</i> and <i>short</i> to aid implementing on small computers</li> <li>No <i>heap</i></li> <li>No <a href="/facts/Parallel_computing/nQzcpzQt">parallel processing</a></li> <li>Limits on the order of declaration and other small syntactic differences to allow one-pass compiling</li> <li>No <i>format</i>s</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Hibbard, P.G. (May 1977). "A Sublanguage of ALGOL 68". SIGPLAN Notices. 12 (5): 71–79. doi:10.1145/954652.1781177. S2CID 37914993. <a href="https://doi.org/10.1145%2F954652.1781177" target="_blank">https://doi.org/10.1145%2F954652.1781177</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>http://vestein.arb-phys.uni-dortmund.de/~wb/a68s.txt. {{cite journal}}: Cite journal requires |journal= (help); Missing or empty |title= (help) [permanent dead link] Description of C.mmp A68S implementation. <a href="http://vestein.arb-phys.uni-dortmund.de/~wb/a68s.txt" target="_blank">http://vestein.arb-phys.uni-dortmund.de/~wb/a68s.txt</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"Archived copy". www.tuhs.org. Archived from the original on 20 July 2008. Retrieved 13 January 2022.{{cite web}}: CS1 maint: archived copy as title (link) <a href="https://web.archive.org/web/20080720120211/http://www.tuhs.org/Archive/PDP-11/Applications/algol68.tar.gz" target="_blank">https://web.archive.org/web/20080720120211/http://www.tuhs.org/Archive/PDP-11/Applications/algol68.tar.gz</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Lindsey, C. H.; van der Meulen, S. G. (1977). Informal Introduction to Algol 68. North-Holland. <a href="/wiki/Charles_H._Lindsey" target="_blank">/wiki/Charles_H._Lindsey</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> </ol>