[colanderman]

Siglent SDS 1104X-E, same as in one of the photos.

In my case, the data was coming from cassette tapes, so the oscilloscope was absolutely overkill in terms of raw bandwidth by 3 orders of magnitude. However I was operating at its memory limit of 14 MSa (megasamples)... running at a sampling rate of 20 kSa/s, I had barely enough memory to grab the full 10 minutes of each tape side.

Its vertical resolution (8 bits) I was a little worried about, but the dynamic range of Differential Manchester/FM is so low it turned out to be a nonissue. Certainly the quantization noise is comparable to the noise floor of the basic-quality cassettes that my data was on.