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Sharp ELSI MATE EL-8109 Scientific Calculator

This Sharp scientific calculator appears to be rather uncommon. Based on the date code on the LSI chip that runs the machine, it is circa mid-1975. It is battery (4 AA-cell) or AC-powered (with an adapter), and uses a 9-digit (8 digits plus sign/error indication on the left digit of the display) standard seven segment VF tube for display. The display cover is tinted green, turning the blue digits of the VF tube a solid green tint, which is unusual.

It does not handle scientific notation, but does have a couple of unusual
functions. It does trig (with inverse) functions in degrees or radians
(based on setting of DEG/RAD switch); log(*x*); ln(*x*);
1/*x*; square root; e^{x}; *x*^{2};
and *y*^{x}. It also has unusual conversions to take
degrees/minutes/seconds (each keyed separately) to decimal notation and back.
The [F] selects the alternate function for each key.
The machine has a [π] key, and a single memory register, with memory recall [RM], [M+], and [*x*->M] keys.

The machine is controlled by a single Rockwell LSI chip, part number A4501PA, with date code of 7519.