Detail from the comments, about the QR-code-like blocks that appear between sprocket holes:
> The blocks also carried software, so that the decoding equipment (such as the DA-10 and DA-20) could have their firmware automatically upgraded in the field, just by playing a newly-released film! Pretty advanced for early 1990 electronics.
I found another oblique reference to this in the manual for the Dolby DA20 sound processor, page 8-6 here, where it refers to "dynamic loading":
however, I can't find anything else online about this. This raises the possibility of putting a film-bourne virus in a movie or trailer, though I'm not totally sure what you could really do by pwning a sound processor.
> The blocks also carried software, so that the decoding equipment (such as the DA-10 and DA-20) could have their firmware automatically upgraded in the field, just by playing a newly-released film! Pretty advanced for early 1990 electronics.
I found another oblique reference to this in the manual for the Dolby DA20 sound processor, page 8-6 here, where it refers to "dynamic loading":
http://www.film-tech.com/warehouse/manuals/DOLBYDA20.pdf
however, I can't find anything else online about this. This raises the possibility of putting a film-bourne virus in a movie or trailer, though I'm not totally sure what you could really do by pwning a sound processor.