Stupid 18C question

[Katie Wasserman]

If you're serious about HP calculators, I highly recommend that you buy the full set of manuals available here.

I don't think that there is a user command to report the amount of free memory. To start with there's only 1200 bytes available to the user, there's a section of the manual that details how much is used up by each data type, formula, etc., but that's about it. You're probably going to need something else. The 18C like the 28C is severely memory challenged.