TI-81 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "TI-81" in English language version.

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datamath.org

Woerner, Joerg (2009-02-08). "DATAMATH: TI-81 (1995)". Retrieved 2013-01-27.
Woerner, Joerg (2009-01-27). "DATAMATH: TI-81 Engineering Sample". Retrieved 2012-02-04.

ti.com

education.ti.com

Christiansen, Brad; et al. "TI-81 Guidebook" (PDF). Texas Instruments, Inc. pp. 8–9. Retrieved 2021-02-04.

ticalc.org

Evans, Travis (2009-08-17). "User Machine Code Execution on TI-81 Becomes a Reality". Retrieved 2013-01-27.
"PC-81 on ticalc.org". 1998-04-28. Retrieved 2012-02-04.

tiplanet.org

"TI-Planet's calculator comparison tool". TI-Planet.