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Line 11: ==External links== [~~http~~https://~~www~~web.archive.org/web/20100711134752/http://bitsavers.org/pdf/ibm/140x/C24-1480-0_1401symbPgmSys.pdf] IBM 1401 Symbolic Programming Systems: SPS-1 and SPS-2, C20-1480-0 "''[http://www.multicians.org/thvv/1401s.html 1401s I have known]''" by [[Tom Van Vleck]] includes a description of an operating environment including 1401 SPS machines. *{{Citation\|title=Gary Mokotoff Collection of IBM 1401 Program Listings, 1959-1961\|url=http://discover.lib.umn.edu/cgi/f/findaid/findaid-idx?c=umfa;cc=umfa;rgn=main;view=text;didno=cbi00093}}

IBM 1401 Symbolic Programming System: Difference between revisions