Details:

A very early machine using LSI chips. Probably the first using rechargeable  batteries making it truly portable.

The display uses rather artistic digits with a kind of half-size zero.

When connected to the charger a switch inside the calculator connector prohibits power to the calculator electronics.

Usage:

Note:  Before it can be used it needs two resets using the “C” key.

Addition/subtraction:

As in mechanical calculators using the “+ =” key and “- =” key

Multiplication:

Enter first number, “X :” key, second number, “+ =” key

Division

Enter first number, “X :” key, second number,  red “- =” key       

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Serial number:

Built in:

Functions:

Power:

Market-introduction:

Production until:

Price:

016690X

1970 (see serial nr. info on  http://www.oldcalculatormuseum.com/t-sharpsn)

Addition, Subtraction, Multiplication,  Division

6 built-in NiCd cells

1970 (The QT8D, being externaly powered was introduced in 1969)

1971?

Approx. DM. 2250,- in 1970  (Source: Büromaschinen Lexikon)