3 Aug
2026
3 Aug
'26
9:59 a.m.
At Sat, 1 Aug 2026 20:42:23 -0400, David Gesswein <djg(a)pdp8online.com> wrote:
The reader is a bunch of instrument amps that amplify
to levels usable by
Saleae logic 16 pro which has analog digitization mode and way too many
times repurposed code to decode it. Doesn't look like I have put it online
probably because the code is embarrassing but ok with giving it away if
someone has use for it.
Here's an alternative to consider: Years ago I wrote a program to decode
waveforms digitized from cruddy old mag tapes in various formats,
including 7-track NRZI, 9-track NRZI, PE, and GCR, and 6-track Whirlwind.
https://github.com/LenShustek/readtape
We've read hundreds of tapes, mostly digitized using a Saleae analyzer.
I never wrote a DECtape decoder, but it would be doable.