IVSYS/7090: Difference between revisions

'''IVSYS/7090''' (for "Iverson System" on the [[wikipedia:IBM 7090|IBM 7090]]) was a proto-APL interpreter in [[wikipedia:FORTRAN|FORTRAN]]. It was implemented by [[Larry Breed]], who worked in [[Ken Iverson]]'s group at [[IBM]]'s [[Watson Research Center]], and [[Phil Abrams]], a graduate student at [[wikipedia:Stanford University|Stanford University]]. Running in 1965, the interpreter was the second computer implementation of [[Iverson notation]], after [[PAT]], and is often considered the first APL implementation, as it preceded [[APL\360]].<ref>[[Adin Falkoff]] and [[Ken Iverson]]. [https://www.jsoftware.com/papers/APLDesign.htm The Design of APL]. IBM Journal of Research and Development, Volume 17, Number 4. 1973-07.</ref> However, it had substantial differences from APL as realized in APL\360, for example using the arrows <syntaxhighlight lang=apl inline>↑</syntaxhighlight> and <syntaxhighlight lang=apl inline>↓</syntaxhighlight> for [[Rotate|rotation]] rather than [[Take]] and [[Drop]].<ref>[[Philip Abrams]]. [http://infolab.stanford.edu/TR/CS-TR-66-47.html An interpreter for Iverson notation]. 1966-08-17.</ref> Initially the program had to entered with punch cards, encoding symbols as multiple characters. However, it was soon adapted to run with a typewriter and [[type ball]], and made available within IBM using the Time Sharing Monitor (TSM), an early [[time sharing]] system.<ref>[[Adin Falkoff]] and [[Ken Iverson]]. [https://www.jsoftware.com/papers/APLEvol.htm The Evolution of APL]. ACM SIGPLAN Notices Volume 13, Number 8. 1978-08.</ref> Ken Iverson and [[Adin Falkoff]] were able to use the system in teaching, and [[Eric Iverson]] to prepare an answer book for the problems in Ken's ''Elementary Functions''. IVSYS was only available in this way for a short time, as the TSM project was terminated to make programmers available for a similar project, [[wikipedia:TSS/360|TSS/360]]. The machine IVSYS itself ran on was at some point put on a shipping platform and taken to an unknown destination.<ref>[[Eugene McDonnell]]. [https://www.jsoftware.com/papers/eem/socio1.htm The Socio-Technical Beginnings of APL].</ref>