Does anyone remember the old old old BASIC code for converting Fahrenheit to Celsius? I'd really appreciate it if someone would post the text.
Check out the following PDF, on page 40 (pdf page 57):
The code would be something like, for Level II BASIC:
10 INPUT "FAHRENHEIT: "; F
20 C = 5 * (F - 32) / 9
30 PRINT F; " FAHRENHEIT IS "; C; " CELSIUS"
40 GOTO 10
If you're using the Model I with Level I BASIC, or some other severely limited TRS-80, you may need something even simpler.