Alex Freed wrote:
What I want is some code loaded into Apple at boot time that will parse the SD card's directory and allow the user to select a file - ProDOS volume or a NIB image. Reading raw sectors from the SD card is trivial via the ProDOS interface. Somebody needs to write an Apple application to do it. I'm sure there are many people on this list more qualified than me. So I'll probably write a very simple one and let somebody else improve on it.
So you are suggesting a read-only FAT16 file system implemented as a boot-code selector to "boot" the chosen file (Apple volume) for actual use? The booted OS would then use read/write drivers for to then carry out the two-level mapping as the OS runs from the pseudo-volume-- in ROM, I expect. The mapping to physical sectors is done transparently by code running on the card that understands FAT16, yes? -michael NadaNet networking for Apple II computers! Home page: http://members.aol.com/MJMahon/ "The wastebasket is our most important design tool--and it's seriously underused."