Atari historians have been able to find documents and tapes of chips and hardware developed at Atari. E.g. http://atariage.com/forums/topic/154479-new-gtia-chips/ .

Nothing like this is happening for Commodore and Amiga.

MOS designed tens (hundreds?) chips and this was its core biz. It is hard to believe that a corporation owning a chip foundry lost all the tapes and blueprints of its chips (I mean not only the Amiga chipset) AND the companies who acquired the rights of what was Commodore did the same.

Why such artifacts don't resurface? How MOS archived such artifacts and where?

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    Not so hard to believe - pressure to dispose of paper for which there is no apparent legal or business reason to keep is at times rather high in companies: It takes space which means rent and/or upkeep costs. Also, in some cases documentation you're not legally required you're either legally not SUPPOSED to keep, or it can only be to your disadvantage to keep (a subpoena can't ask you for documentation you were allowed to destroy IF you actually destroyed it). While that is unlikely with tech docs, maybe nobody had time to sort old stacks of paper... – rackandboneman Oct 2 '17 at 19:12

MOS was renamed to Commodore Semiconductor Group (CSG) sometime after Commodore bought them in 1976. After Commodore folded in 1994, the CSG division was bought by its former management and renamed to GMT Microelectronics (Great Mixed-signal Technologies).

They continued with design, manufacture, and marketing of analog and mixed-signal power management integrated circuits and also provided foundry services and low-cost wafers until they where shut down by the EPA in 2001 due to leaking underground hazardous waste storage tanks. At that point they ceased operations, all assets were liquidated, and the plant became a Superfund site. There doesn't seem to be any solid information past that online as to what happened to any remaining assets when GMT was liquidated.

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