HP HP-20S - Shift Keys and Input

The Shift Keys
Most keys have blue or yellow functions printed above the key. The
shift keys access these labeled operations: the blue shift key executes
a blue labeled operation; the yellow shift key executes a yellow la-
beled operation. To perform a shifted operation, press (5] or (] to
turn on the shift annunciator ([%) or (¢>]). Then, press the key that
has the desired label above it.
For example, pressing [4] followed by (also written [q][HEX]) puts
the calculator in Hexadecimal mode. Pressing (4] puts the
calculator in Decimal mode.
To perform consecutive shifted operations, hold down the shift key.
If you accidentally press (] or [¢>], just press it again to turn off the
shift annunciator. If you press the wrong shift key, press the other
one to cancel it and display the correct one.
The INPUT Key
The key is used to separate two numbers when using two-
number functions or two-variable statistics.
The : annunciator is displayed if has been pressed. If a number
is in the display, press to erase the : annunciator and the display.
If the cursor or an error message is visible in the display, press
twice to erase the : annunciator.
The SWAP Key
Pressing [(#y] [SWAP] exchanges:
14 1: Getting Started