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Update README.md
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@ -62,10 +62,13 @@ the default behavior, and skip the DIP switch and Diodes D17-D20 and D24-D27.
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### Second 74LS138 multiplexer (U4)
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### Second 74LS138 multiplexer (U4)
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Only needed if you have more than 8 rows.
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Only needed if you have more than 8 rows.
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### The 74LS07 hex buffer (U5)
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### The 74LS07 hex buffer (U5) and pullup R6
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Only needed if you are using LED2 or LED3 on the keyboard, or the OUT2 open
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The 74LS07 is only needed if you are using LED2 or LED3 on the keyboard, or the OUT2 open
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collector output.
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collector output.
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R6 is the optional pullup for the open collector output 2 (O2), and only needs to be
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installed if output 2 is used, and if the host does not provide a pullup.
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### Diodes D21, D22, D23
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### Diodes D21, D22, D23
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Some keyboards may not wire all keys into the matrix. For example, some other
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Some keyboards may not wire all keys into the matrix. For example, some other
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interface modules may assign special hardware functions to certain keys. Those
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interface modules may assign special hardware functions to certain keys. Those
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