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Unisonic 799 Information

*by Alex Knight, updated May 22, 1998*

The Unisonic 799 (799-A) is a basic scientific calculator,
with an eight-digit green flourescent display. It
measures 3.5" wide by 6" high. There
is a ninth display column on the right side of the
display that has overflow, minus, and memory indicators.
The machine is powered by a four AA batteries with
an AC adaptor plug at the top left of the case.
Power consumption is listed on the back at 0.5 Watts.
It has a classic Unisonic stainless-steel covered
case, although the case itself is black plastic.
The machine weighs approx. 6.5 oz. without batteries.
There is an instruction label on the back of the machine
that has the keystrokes needed for six example problems.

The machine has an on-off switch and a DEG/RAD switch.
The second-function key, marked F, is a red color.
The function keys are blue and marked as follows:
X/Y (X exchange with Y), X/M (X exchange with memory),
X raised to Y, C, CM (clear memory), DR (degrees to radians),
MR (memory recall), -, divide,
+, x, M+, +/-, and =. The only function key that
has a second function is the +/- key, whose second
function is pi. The numeric keys are white, and
their second functions are (from 0 to 9): 1/x,
e to x, ln x, log x, sin-1 x, cos-1 x, tan-1 x,
sin x, cos x, and tan x, with the decimal point key
having the second function square root.
The machine utilizes a Rockwell calculator IC which
provides only basic scientific notation. There is no
provision for scientific notation in this machine.
I believe it to date from 1975, based on date codes
inside the machine.

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