Datapoint 2200 software ?
frustum at pacbell.net
Tue Jan 16 21:31:15 CST 2007
Jos Dreesen wrote:
> Does anyone know of software repositories for the Datapoint 2200 I or
> II machines ?
> Jos Dreesen
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.
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