HP 33s - Manual (Page 198)

13–14 Programming Techniques
Example: Controlling the Fraction Display.
The following program lets you exercise the calculator's fraction–display
capability. The program prompts for and uses your inputs for a fractional number
and a denominator (the /c value). The program also contains examples of how the
three fraction–display flags (7, 8, and 9) and the "message–display" flag (10) are
used.
Messages in this program are listed as MESSAGE and are entered as equations:
1. Set Equation–entry mode by pressing | H (the EQN annunciator turns
on).
2. Press L letter for each alpha character in the message; press p (the
g key) for each space character.
3. Press ‘ to insert the message in the current program line and end
Equation–entry mode.