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wysekbd: Note

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AJR 2023-04-30 23:44:28 -04:00
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src/devices/bus/wysekbd/wysekbd.cpp
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@ -14,7 +14,8 @@
These keyboards generally use simple gate arrays rather than MCUs. The
MCU in the terminal is responsible for scanning the entire key matrix
one switch at a time, which it does by sending a series of pulses on
CMD and shifting bits in from the DATA return line.
CMD and shifting bits in from the DATA return line. The protocol is
further described in U.S. Patent 4,706,068.
Each keyboard has a different matrix layout, so the same key may appear
at different indices on different keyboards. The one consistent feature