Radio Shack TRS-80 PC-4

Manual calculation and program calculation are performed in the "R UN" mode. (Press
~ [e) and RUN will be displayed.l
"0 EG", "RAO" and "G RAil, only apply to angular units and their display has no
effect for a calculation which has nothing to do with angular units.
The PCA
has a built in Calculation Priority Sequence and will perform calculations
based on that sequence.
The Calculation
Priority Sequence is determined as follows.
CD Functions (S IN, COS, TAN, etc.)
®Power
@Multiplication and division (* and /)
@Addition and subtraction (+ and -)
Example:
2 + 3 *SIN (17+ 13) t 2 =2.75
"-----I
CD
®
The PC-4 can sustain 12 input positions for the mantissa portion and 2 positions for the
exponential portion. Internal operations are also performed using 12 positions for the
mantissa portion and 2 positions for the exponential portion. The range extends from 1 x
10-
99
to ±9.99999999999 x 10'"99 and O.
The number of output positions is 10 for the mantissa portion and 2 for the exponential
portion. However, if an exponential portion is attached, the mantissa portion will be 8
positions.
* For function results, when the number of display positions (12 positions) is ex-
ceeded, up to 12 positions will be displayed, including 0 and the decimal point.
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