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I was thrilled to see the source code has been recovered, and also that it will be made public at some point. I played those on Amiga in the day. Will you be releasing the whole of the contents of the tape? I'm probably in a minority in that I'm far more interested in the internals than the games themselves. Infocom archaeology has progressed a long way (I wrote the first decompiler for z3 games, following on a number of earlier peoples' works, and have spent a lot of time studying the extant tech left over), but there is almost nothing known from Magnetic Scrolls, at least last time I looked into it a few years back.
So, they used a MicroVAX in the late 80s--was it running VMS or BSD (or Ultrix)? Did they do the Infocom route of a concisely defined vm for portability with an interpreter (or should we call it hypervisor?), or a compile targeted at each architecture? Also, what language?
(I worked on MicroVAXen IIs at the university, running BSD--also VAXstations and DECstations. I saw you had a DECstation 3100. Those were marvelously fast machines in their day, running Ultrix. I remember the VAXstations perversely had scsi interface cards that were male, so you had to be careful plugging in cables--bend or break a pin and you'd be paying for a new card, vs a new cable. I don't remember if the DECstations had those too. Someplace around here I have a bunch of ultrix cdroms for those decstations).
Anyway, great news.