@gothmag
I just received my Teensy64 board and have been having a play. I've started doing a basic implementation of the D64 image format. There is a good library available called diskimage.c, though it appears to load the entire disk image into memory. I don't think this is good on a microcontroller.
As a result I have been writing my own by taking some parts of diskimage.c and following the documentation at http://unusedino.de/ec64/technical/formats/d64.html. I've done a rough implementation of loading a directory, following the directory entries from track 18/1 on. I've used the existing method in pacthes.cpp for hooking the load. In my current builds LOAD "$" returns the sdcard contents and LOAD "$IMAGE.D64" loads the directory from the image file. I've followed the existing code from Frank for the SDCard patch basically. In the image you can see the title, blocks free, file type are incorrect. I'm currently doing the BAM stuff for this.
@all: If anyone else is already doing this work, please let me know.
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I'd be very interested in this as well, even if not all disk images would be possible due to fastloaders and/or copy protection it might still be very useful.