R series PDP-8 board information and R405 Crystal Clock
This board is a crystal oscillator with output pulse amplifier. The frequency is stable to .01% over 0 to 55C. Frequency may be specified from 5kc to 2 mc (Current units 5kHz to 2 MHz) and is stamped on the crystal can. This board is 10 kc and makes a high pitched whine when operating. This board cost $100 in 1968.
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with any questions, comments on the web site, or if you have related equipment,
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