[TUHS] Un-released/internal/special UNIX versions/ports during the years?

Hi! Some of the stories on here reminded me of the fact that there's also likely a whole boat-load of UNIX ports/variants in the past that were never released to customers or outside certain companies. Not talking about UNIX versions that have become obsolete or which have vanished by now like IRIX or the original Apple A/UX (now *that* was an interesting oddball though..) and such, but the ones that either died or failed or got cancelled during the product development process or were never intended to be released to the outside ar all. Personally I came across one during some UNIX consultancy work at Commodore during the time that they were working on bringing out an SVR4 release for the Amiga (which they actually sold for some time) Side-note.. Interestingly enough according to my contacts at that time inside CBM it was based on the much cheaper to license 3B2 SVR4 codebase and not the M68k codebase which explained some of the oddities and lack of M68k ABI compliance of the Amiga SVR4 release.. However.. It turned out that they had been running an SVRIII port on much older Amiga 2000's with 68020 cards for some of their internal corporate networking and email, UUCP, etc. and was called 'AMIX' internally. But as far as I know it was never released to the public or external customers. It was a fairly 'plain jane' SVRIII port with little specific 'Amiga' hardware bits supported but otherwise quite complete and pretty stable. Worked quite well in the 4MB DRAM available on these cards. The later SVR4 didn't fare so well.. Paged itself to death unless you had 8 or even (gasp!) 16MB. It was known 'outside' that something like this existed as the boot ROM's on the 68020 card had an 'AMIX' option but outside CBM few people really knew much about it. It may have been used at the University of Lowell as they developed a TI34010 based card that may already have had some support in this release. Still.. This does make me wonder.. Does anyone else know of these kinds of special 'snowflake' UNIX versions that never got out at various companies/insitutes? (and can talk about it without violating a whole stack of NDA's ;) ) No special reason.. Just idle curiosity :) Likely all these are gone forever anyway as prototypes and small run production devices and related software tends to get destroyed when companies go bust or get aquired. Bye, Arno.