HP50G SD card STO and RCL

[DavidM]

(10-31-2014 12:27 AM)Paul 6146 Wrote:  I just got an HP50G and I can only find one document on the web that deals with the SD card and how to use it.

If you haven't already done so, I would suggest reading through the HP 50g User's Guide section that's devoted to the SD card ("Using SD cards", starting on page 26-7). That will probably fill in some of the details that you haven't seen yet.

(10-31-2014 12:27 AM)Paul 6146 Wrote:  I am trying to learn how to save programs to the SD card and then RCL them and save them as a user program.

This is a bit ambiguous. When you say "save programs to the SD card", are you saving them using the 50g, or are you attempting to save them to the card using a computer (eg. creating the source on a PC)? There's a big difference, and the answers will vary depending on what your intent is. Could you elaborate further?

(10-31-2014 12:27 AM)Paul 6146 Wrote:  Also, when you RCL a directory on the SD card, how can you pick out 1 program from the directory (now on the stack) and make it a program on the calculator?

The answer may depend on how the item was originally stored on the card, but if you've RCL'd a directory object to the stack from the SD card by name (eg. :3:"MYDIR" RCL), it will exist as a single object in stack level 1. Even though that directory may contain other elemental objects (numbers, programs, lists, etc.), it is still a single "container" object when recalled to the stack in that way. The only method I know of to work with the individual items it contains would be to store that directory object as a user (global) variable first ('MYDIR' STO). Then you can navigate to the item(s) of interest and do whatever is needed. If you're only interested in one item, simply recall that to the stack, delete the newly created directory, then save the remaining stack item wherever you need.

Hope this helps!
- David