With an USB on the go chip, it shouldn't be too difficult I guess.
A few days ago a hack for the TI84 calculator (Z80) was presented,
and indeed it works like a charm.
see
http://cellphones.hackaday.com/2006/09/14/usb-flash-drive-on-a-ti84/
cheers,
Stef

Ariel Rocholl wrote:

>Hi, I have some of these cheap FLASH devices, with TrueFFS (FAT) file system
>drivers included. I see no easy way to reuse them in a way I connect them to
>a PIC, because the TrueFFS driver is designed to talk with an OS. Does
>anyone has experience in such a setup (PIC + DiskOnChip)?
>
>  
>

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