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