HP49g+ and SD/USB file storing



#5

Does anyone know if the HP 49g+ be used like a USB stick to store any type of files on the SD card and then transferred to other computers?


#6

the files have to go through the calc, there is not direct connection to the SD card.
The calc OS at the moment, and I guess for ever, limits the size of files to 128k.

So yes you can, and I do. But it is only for very small files. I usually carry a small USB SD card reader with my 49g+

Arnaud


#7

Besides the file size limitations, when the calculator receives a file without a valid transfer header, it stores it as a character string. That is, it prepends the 5-nibble prologue for a character string object, followed by the 5-nibble length field, so now you have 5 extra bytes at the beginning of the file.

When the 49g+ stores anything on the SD card, it stores it as a binary transferred file. That is, it prepends an 8-byte binary transfer header HPHP49-X, which is followed by the compiled object itself, starting with it's prologue. Of course, if it's moved back to the 49g+'s memory, the header is discarded. But if you put the card in a PC's card reader, you now have 13 extra bytes at the beginning of the file.

So the 49g+ and its SD card can be used to store arbitrary files of limited size with minor modifications, but it may well make more sense to simply use a USB stick.

#8

I think the 128K limit is only port 1/2. I've stored 220K files from main RAM into SD without problem.


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