On Dec 21, 15:46, Patrick Finnegan wrote: for floppy try Having now read the docs, I'm partway to believing it. For those who've not downloaded the trial copy and read the docs, the trick is to have the disk to be read in one drive, and a standard disk in another. Start both drives, start reading the standard disk, but using the "Read Track" (diagnostic) command, watch for the DMA to start working (which means it's read a header and has started to transfer the data stream), and then switch drives and double the data rate setting. The idea is that by doing this, the FDC sees a valid header and starts transferring bits, then by doubling the data rate you get the raw data + clocks off the other disk. Then it's a matter of decoding what you have in your buffer; finding the sync patterns, working out the density and sector sizes, numbers and so on. I know that can be done, because I've a program (written about ten years ago) that does it. It uses a 1770 to read raw data (only from FM/MFM disks though) and then decodes it; it's designed to copy protected disks and I've never once known it fail, though it sometimes takes a while to work out exactly what it has in the buffer and how to write it back. Of course the patterns on Apple and Commodore disk aren't the same, but in principle it should be doable. -- Pete Peter Turnbull Network Manager University of York