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It is not clear if the creators behind the HP-41 were aware of all these "black holes". HP did not officially support these techniques, but probably was intrigued by the strange operations and in some cases allowed enthusiasts to practice in their offices and helped to improve it among a whole sense of curiosity.
==See
* [[NOMAS (support)]]
{{reflist| refs=▼
<ref name=IEEE>{{cite journal| doi=10.1109/MAHC.2011.63| title=Once Upon a Pocket: Programmable Calculators from the Late 1970s and Early 1980s and the Social Networks Around Them| year=2012| last1=Ristanovic| first1=Dejan| last2=Proti| first2=Jelica| journal=IEEE Annals of the History of Computing| volume=34| issue=3| pages=55–66| s2cid=15888694}}</ref>▼
==References==
▲<ref name="IEEE">{{cite journal |
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==Further reading==
*{{cite book| last=Jarett| first=Keith| date=1982| title=HP-41 Synthetic Programming Made Easy| ___location=United States| publisher=Synthetix }}▼
* {{cite book
▲* {{cite book
*{{cite book| isbn=0-9510733-0-3| title=Extend Your HP-41| last1=Mier-Jedrzejowicz| first1=Wlodek| year=1985}}▼
* {{cite book
▲* {{cite book
* {{cite book |isbn=0-9612174-6-4 |title=HP-41 Advanced Programming Tips |author-last1=McCornack |author-first1=Alan |author-last2=Jarett |author-first2=Keith |date=1987}}
* [http://nonpareil.brouhaha.com/microcode_simulation.pdf Microcode-Level Calculator Simulation], by Eric Smith, presented at 2004 Hewlett-Packard Handheld Conference in San Jose, California on 26 September 2004
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