Modula-2+

<h2 id="implementations">Implementations</h2>
<p>Modula-2+ was used to develop Topaz, an <a href="/facts/Operating_system/8XTuvMh2">operating system</a> for the SRC <a href="/facts/DEC_Firefly/pb2dTf2n">DEC Firefly</a> <a href="/facts/Shared_memory/zmpH7WuV">shared memory</a> <a href="/facts/Asymmetric_multiprocessing/f05hC5vD">asymmetric multiprocessing</a> <a href="/facts/Workstation/h5tK4hTt">workstation</a>.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> Most Topaz applications were written in Modula-2+, which grew along with the development of the system.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> Modula-2+ was also used by Acorn in the <a href="/facts/ARX_(operating_system)/wy8z6nHx">ARX</a> operating system, and to build an <a href="/facts/Integrated_development_environment/jbEINSQf">integrated development environment</a> in the Acorn Research Center (ARC).<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> Modula-2+ strongly influenced other languages such as <a href="/facts/Modula-3/RbblULyn">Modula-3</a>, but as of 2005, it had disappeared.
</p><p>The original developers of Modula-2+ were both acquired: Acorn by <a href="/facts/Olivetti/bdoq8XPH">Olivetti</a> and <a href="/facts/Digital_Equipment_Corporation/ztxs6keA">Digital Equipment Corporation</a> by <a href="/facts/Compaq/6LuhWTE7">Compaq</a>. Compaq was bought by <a href="/facts/Hewlett-Packard/abuNSYNu">Hewlett-Packard</a>. <a href="/facts/Olivetti/bdoq8XPH">Olivetti</a> sold the Olivetti Research Center and Olivetti Software Technology Laboratory (after bought Acorn ARC) to <a href="/facts/Oracle_Corporation/0z14FygH">Oracle Corporation</a> and was later absorbed by <a href="/facts/AT%26T/y3Lo9uhk">AT&T</a>.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> DEC have made the SRC-reports available to the public.
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<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Modula/pxLbgVF5">Modula</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Rovner, Paul; Levin, Roy; Wick, John (January 11, 1985). SRC-RR-3 On extending Modula-2 for building large, integrated systems. Hewlett-Packard Labs (Report). <a href="http://www.hpl.hp.com/techreports/Compaq-DEC/SRC-RR-3.html" target="_blank">http://www.hpl.hp.com/techreports/Compaq-DEC/SRC-RR-3.html</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>DeTreville, John (November 22, 1990). Experience with concurrent garbage collectors for Modula-2+ SRC-RR-64. Hewlett-Packard Labs (Report). <a href="http://www.hpl.hp.com/techreports/Compaq-DEC/SRC-RR-64.html" target="_blank">http://www.hpl.hp.com/techreports/Compaq-DEC/SRC-RR-64.html</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>DeTreville, John (November 22, 1990). Experience with concurrent garbage collectors for Modula-2+ SRC-RR-64. Hewlett-Packard Labs (Report). <a href="http://www.hpl.hp.com/techreports/Compaq-DEC/SRC-RR-64.html" target="_blank">http://www.hpl.hp.com/techreports/Compaq-DEC/SRC-RR-64.html</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
<li id="fn:4"><p>Thacker, Charles P.; Stewart, Lawrence C.; Satterthwaite, Edwin H. Jr. (December 30, 1987). Firefly: a multiprocessor workstation SRC-RR-23. Hewlett-Packard Labs (Report). <a href="/wiki/Charles_P._Thacker" target="_blank">/wiki/Charles_P._Thacker</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li>
<li id="fn:5"><p>McJones, Paul R.; Swart, Garret F. (September 28, 1987). Evolving the Unix system interface to support multithreaded programs SRC-RR-21. Hewlett-Packard Labs (Report). <a href="http://www.hpl.hp.com/techreports/Compaq-DEC/SRC-RR-21.html" target="_blank">http://www.hpl.hp.com/techreports/Compaq-DEC/SRC-RR-21.html</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li>
<li id="fn:6"><p>Cardelli, Luca; Donahue, James; Glassman, Lucille; Jordan, Mick; Kalsow, Bill; Nelson, Greg (November 1989). Modula-3 Report (revised), Research Report 52, SRC-RR-052. Hewlett-Packard Labs (Report). DEC Systems Research Center (SRC). <a href="ftp://apotheca.hpl.hp.com/pub/dec/SRC/research-reports/abstracts/src-rr-052.html" target="_blank">ftp://apotheca.hpl.hp.com/pub/dec/SRC/research-reports/abstracts/src-rr-052.html</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li>
<li id="fn:7"><p>Kossow, Al (August 2001). "Not a RISC by Thursday". Newsgroup alt.folklore.computers,comp.sys.acorn.misc. <a href="http://neil.franklin.ch/Usenet/alt.folklore.computers/20010824_Not_A_RISC_By_Thursday" target="_blank">http://neil.franklin.ch/Usenet/alt.folklore.computers/20010824_Not_A_RISC_By_Thursday</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li>
</ol>

Modula-2+ open-in-new

Modula-2+