The Cal-Tex CT7001 is an integrated circuit from the early 1970's
that provides a multiplexed six-digit clock output as well as
It may also have been sold by Radio Shack with their part number 276-1756.
If you have spare CT7001 chips or other early timekeeping circuits that are gathering dust, please send me an e-mail. I can put them to good use!
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Updated October 8, 2014