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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