White ceramic processors come from many sources. The most common were computers from the USSR/CCCP. They make up around 75% of white CPUs. The rest, date back to the early 70s-mid 80s in general. Kit (or prebuilt kit) computers like the Altair, the Tandy 9x and 12x series, early commodore pet and 64 computers, and Texas Instruments systems. They are also found in digital calculators from the 70s (HP, IBM, Commodore), terminal units (Altair, Atari, Xerox) aerospace boards, (jet planes, rockets,) guided ballistics, military control panels. The names and dates are what I know from experience. However there are many more places to find them. Especially in early 80s computers and 70s/80s terminals. Where they show up randomly; often as replacement parts.
As a side note the earliest Intel 4xxx chips were mostly white and Bell Labs' ICs for switching stations are also white, but both use platinum plated nickel pins. So if it's white, and not gold legs, have the legs tested by a trusted source or service.
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