HP HP-20S - Annunciators

To clear all memory and reset the calculator, press and hold down
(C], then press and hold down both and [Z+]. When you release
them, all memory is cleared. The ALL CLr message is displayed.
Annunciators
Annunciators are symbols in the display that indicate the status of the
calculator.
Annunciator Status
(H) Left shift is active. When you press a key, the function la-
beled in blue above the key is executed (page 14).
(~] Right shift is active. When you press a key, the function
labeled in yellow above the key is executed (page 14).
has been pressed, or two values have been en-
tered or returned (page 14).
PEND An arithmetic operation is pending in addition to what
shows in the display.
1 Battery power is low (page 9).
GRAD The calculator is in Grads mode for trigonometric calcula-
tions (page 35).
RAD The calculator is in Radians mode for trigonometric cal-
culations (page 35).
HEX The calculator is in Hexadecimal mode (page 44).
OCT The calculator is in Octal mode (page 44).
BIN The calculator is in Binary mode (page 44).
PRGM The calculator is in Program mode. (Refer to chapters 6
and 7.)
1: Getting Started 13