A6701
The Tektronix A6701 is an 18-bit Word Recognizer adapter for general purpose oscilloscope triggering. It requires a separate power supply, 015-356-00 and the matching interconnect cable. Used alone (up to 4 may be chained for 72 bits) the max clock rate is 50 MHz.
It was introduced in TekScope Vol 11, number 2, 1979.
Pictures
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Top view
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power and trigger I/O
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Digital inputs
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power supply
