HP 48 series (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "HP 48 series" in English language version.

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hpcalc.org

"HP 48 I/O Technical Interfacing Guide". hpcalc.org. Hewlett-Packard. 1990-06-14. Retrieved 2020-09-12.
Schoorl, André; Maddock, Keith; Okahata, Darryl (2000-04-14) [1997]. Rechlin, Eric (ed.). "HP48 FAQ Section 3: Questions about ROM versions". Official HP48 FAQ - Answers to Frequently Asked Questions about the HP48. 4.62. HP Calculator Archive. Archived from the original on 2016-08-20. Retrieved 2015-09-12.
Wickes, William C. (1991-03-12). "HP 48 Version F: False Alarm". comp.sys.handhelds. hpcvra.cv.hp.com item: 2404. Archived from the original on 2016-04-28. Retrieved 2016-08-20.
"HPedia: The HP Calculator Encyclopedia".

Paiva, Joseph V. (2004-10-01). "The End of An Era - On the genesis, life and death of the HP 48". Point of Beginning (PoB). BNP Media. Archived from the original on 2016-08-20. Retrieved 2015-10-20.

Paiva, Joseph V. (2004-10-01). "The End of An Era - On the genesis, life and death of the HP 48". Point of Beginning (PoB). BNP Media. Archived from the original on 2016-08-20. Retrieved 2015-10-20.
Schoorl, André; Maddock, Keith; Okahata, Darryl (2000-04-14) [1997]. Rechlin, Eric (ed.). "HP48 FAQ Section 3: Questions about ROM versions". Official HP48 FAQ - Answers to Frequently Asked Questions about the HP48. 4.62. HP Calculator Archive. Archived from the original on 2016-08-20. Retrieved 2015-09-12.
Wickes, William C. (1991-03-12). "HP 48 Version F: False Alarm". comp.sys.handhelds. hpcvra.cv.hp.com item: 2404. Archived from the original on 2016-04-28. Retrieved 2016-08-20.