HP HP-67 - Page 149

Simple Programming 145
If you wrote and loaded the programs as called for in Problems 2 and
3, you should now be able to convert any temperature in Celsius
to Fahrenheit by pressing {8, and any temperature in Fahrenheit to
Celsius by pressing ¥ (c]. You can see how you can have many
different programs loaded into the HP-67 and select any one of them
for running at any time.