Front of the W684 intensity amplifier. This board converted the input TTL intensify pulse to the 62 volt signal needed to intensify a spot on the CRT. This board also support 8 levels of intensity through a 3 bit control signal.
In units without the light pen the W682 board was used. It didn't support the multiple intensity levels but supported a single address line to allow control of two monitors from one point plot generator board set.
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