Here is the sharp compet digital rule. According
to the manual:
"The
PC1802 is a handy type function electronic calculator particularly designed
for the scientific and technical calculations. It is the result of SHARP's
high technical might to combine an ordinary desktop calculator with a slide
rule into one unit. You can compute 12 types of functions with amazing
accuracy by one touch operation."
This
early scientific calculator is really a four function calculator with a
memory that the makers have ingeniously added scientific functions. it works
to 8 digits with no internal and cannot represent exponential values meaning
that the numbers are floating with no express exponent.
Nevertheless, a useful set of operations are provided with trigs in degrees
and radians, their inverses, logs and square root. powers are conspicuously
missing although these could be evaluated using logs.
Accuracy
is somewhat lacking with the trigs and logs giving only 6 figures whilst
square root manages 8. however, the trig results are displayed with the last
two digits off so that the otherwise incorrect figures are supressed.
The unit
takes 5 (!) AA batteries or can be powered from the optional EL97 mains
adapter.
