- Flip Chip (trademark)
Flip-Chip modules were used in the DEC
PDP-7(Referred to in documentation as the "FLIP CHIP"), PDP-8, PDP-9and PDP-10, beginning on August 24, 1964.
There appeared to be some confusion inside DEC at the time, as various manuals refer to it as "FLIP CHIP", "Flip Chip", "FLIP-CHIP", "Flip-Chip" and "Flip Chip", with trademark and registered trademark symbols.
The modules were called "Flip Chip" because early versions of some of these modules used
flip chipmounting for individual diodechips, but were eventually found to be unreliable so conventional discrete diodes replaced the flip chips. In later computers where DEC used integrated circuits they continued to use "Flip-Chip", despite the fact that actual flip chip mounting was not used, so that they could retain their trademark. Eventually the trademark was allowed to expire.
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