Several of the reciprocal counters (DC509, DC5010) Tektronix built for their
TM500/TM5000 test equipment mainframes use a National Semiconductor noise
generator chip to dither their reference clock. They do this mainly to handle
the case where the input freq and reference clock are very close.
The noise generator chip is not a true noise generator. I think it used a ROM
table to play back a fixed "random" bit pattern.
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