At 06:09 PM 10/28/02 -0800, dwight elvey wrote: I spotted it, and I knew what it was. But how could you tell that? Probably other people were the same. That, I didn't spot. I noticed the waveforms on the wall, but amidst the din (auditory and visual) it didn't register. I wish I had noticed, though, since it is an area I want to spend some time working on one of these years. Rather than letting it be lost to the moment, is there any chance of you writing up your work and putting it online somewhere (even posting it to this list and letting it get archived would work). I've read a half dozen very terse summaries of emulators and such that do this, but most work only on really clean tapes. They simply do some DC correction, perhaps a bit of filtering, and then time zero crossings and decode from there. Have you done something more sophisticated than this? Some of the Sol tapes I've looked at are way too corrupted for such a simple technique to work. There are a lot of communication theory ideas that could be applied to the problem directly; in addition, the file format is going to have some known structure that could be used to help train the receiver and disambiguate some cases. I'd be interested to hear more. ----- Jim Battle == frustum(a)pacbell.net