Calculatrum
Calculatrum electronicum (-i, n.) sive machinula calculatoria est machina ad numeros calculandos fabricata, saepe gestabilis, quae arithmeticas operationes electrice solvit. A computatro differt, quod programmabile olim non fuit, ac tantum arithmeticas operationes agere poterat.

 Abacus

Notae

Bibliographia
 Chapman, S. 1942. "Blaise Pascal (1623–1662): Tercentenary of the calculating machine." Nature 150, no. 3809 (31 Octobris): 508–509. . Bibcode 1942Natur.150..508C.
 Hamrick, Kathy B.  1996. "The History of the Hand-Held Electronic Calculator." The American Mathematical Monthly 103, no. 8 (October): 633–39. . JSTOR 2974875.
 Ifrah, Georges. 2001. The Universal History of Computing. Novi Eboraci: John Wiley & Sons. ISBN 978-0-471-39671-0. Textus interretialis.
 Marquin, Jean. 1994. Histoire des instruments et machines à calculer, trois siècles de mécanique pensante 1642–1942. Hermann. ISBN 978-2-7056-6166-3.
 Williams, Michael R. 1997. History of Computing Technology. Los Alamitos Californiae: IEEE Computer Society. ISBN 978-0-8186-7739-7.

Instrumenta mathematica