Downloading Aplets & e-lessons
The process for downloading an aplet (e-lesson) is exactly the same as for any other calculator object. Indeed, if it is simply a re-named aplet that you have stored information in and then saved to the PC, there is no difference at all. The only difference is that most of the aplets that you will download from this site have attached programs that help them to run.
As explained on a previous page, these helper programs are usually named after the aplet. For example an aplet called "Linear Programming" might have helper programs called .LINPROG.ANL, .LINPROG.PLT, .LINPROG.CON etc. They are automatically stored into the Program Catalog even though the aplet itself is downloaded to the Aplet Library.
When you are downloading the aplet you must wait until all these helper programs have been transferred because the aplet not work correctly without them. Sometimes there are pauses as the various programs download so make sure you have all of them before you unplug.
Additionally, once you have transferred these aplets to your calculator then you must be careful not to delete the helper programs from your Program Catalog unless you have finished using the aplet. When you have finished with it you have to delete the aplet in the Aplet Library and also the helper programs from the Program Catalog. If you don't do this then the Program Catalog will eventually fill up with them to the point where you can't find the programs you want.
Essentially the process is:
Games and other special aplets
A very few of the mathematical aplets and most games are written in a special programming language called sRPL. This language is much more difficult to use than the built in language HP Basic but the result is an aplet that is massively faster and more compact than one created with HP Basic. However, you have to download a lot of them in a special way. The way you know that this alternative method is required is generally that try to do it as outlined above and the download will appears to work but fails at the last moment.
The trick is to
choose the 'HP39/40 (USB)' option from the RECV menu instead of the usual
USB Disk drive... If you do this then a file selection box will pop up
on the PC. Use this to choose which file to download. Usually this is fairly
obvious - eliminate any documentation files, ignore the two HP39DIR files and
this usually only leaves the one you want, which will almost always have a
One advantage of downloading in this way is that it is much faster than the Disk drive... method. Unfortunately you can't use it for aplets that have helper programs because only the file you specify is downloaded and not the helper programs. Since the aplet won't function without those it's not really much use. You could change into the Program view and download each one separately but the problem is that you won't know which of the files on the PC should be downloaded and which not.
Some warnings about games:
Last modified: 19 Dec 2007 Sitemap Home Contact Me