Jos Dreesen wrote: Al Kossow has some tapes, and he recorded them (432 MB of aiff files). I made a stab at writing a software decoder. I could recover most of the files, but I had to tweak my algorithm for specific files. Other things then distracted me and I haven't gone back to it. One problem I had was that the tape slows down and speeds up as it stops between each block. The simple-minded decoder uses a PLL to track frequency variation, but it sometimes gets confused during those transitions. My intent was to add some logic to notice these transitions and to automatically ignore them. But I lost interest before that happened. It would be really great if someone wrote an emulation for the datapoint machines; it would then be more motivation to dig up and prepare software. Jos, I can send you a zip file of what I have. Al, I promised to clean this up and send it to you, but I just don't know when I'll have time to clean it up, so I'll mail it to you.