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Information sheet for Mathatronics Mathatron 8-48M (Version I)

There were two versions of the Mathatron 8-48M, Version I, which was an adaptation of the original Mathatron 8-48 to provide "hard coded" math programs (in magnetic core-based ROM) for advanced mathematics functions. The 8-48M was joined by the 8-48C (for Civil Engineering applications), the 8-48S (for Statistical applications), and the 8-48SC (for Scientific applications). All of these Version I calculators utilized a rotary switch on the keyboard panel to select the advanced function, along with an additional keyboard key that cause the selected function to be executed.

Document provided by the Charles Babbage Institute