HP 39gs Master Manual page 242

Normally the result of this will be a series of small pop up boxes on the PC showing the progress of the file
transfer. Since most objects on the calculator are small the pop ups don't tend to stay visible very long. Some
aplets will take up to 45 seconds to transmit if they contain large amounts of data or if they contain linked
programs. Don't unplug until you are SURE that everything has been transmitted. Sometimes there is an
extended pause between files.
If this is the first time that you have used the folder you chose then you
will see the screen shown right. Two small files are normally created in
the folder to hold a record of what has been stored there. This screen is
simply asking if it is alright to create these files. The files are called
HP39DIR.CUR and HP39DIR.000. They should not be edited or
interfered with in any way or the record contained in them may be damaged or lost.
During the file transfer process the calculator will also show various pop
up boxes to show progress. Their contents depends on what is being
transmitted.
The filename that is used on the PC to store the object is normally
contracted as shown in the screen to the right. This is not important
since, thanks to those "two small files" mentioned in the previous paragraph, the full name will be recorded
and restored when transferred back to the calculator. The reason for the contraction is that the original
hp 38g from which the hp 39gs and hp 40gs are derived was released for an earlier version of Windows
that did not allow long filenames. This has never been changed on later models.
Time out
If you see a message saying that there has been a "Time-out", it means
that communication with the PC has been lost. This can be due to low
batteries. Communication with the PC is very power intensive and
problems may occur before the low battery indicator lights up at the top
of the calculator screen. It can also be due to problems with the
communications software. The USB connection seems to be quite
unstable and you may find that you need to close the program and re-start it at times to restore
communications.
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