+# Miscellaneous
+## NKRO Doesn't work
+1. Build with this option of Makefile
+
+ NKRO_ENABLE = yes
+
+2. After boot keyboard may be in **boot mode**(6KRO), you will need to replug keyboard to enable NKRO.
+
+3. Or use `Magic` **N** command to toggle NKRO function.(`LShift+RShift+N` by default)
+
+
+
+## TrackPoint needs reset circuit(PS/2 mouse support)
+Without reset circuit you will have inconsistent reuslt due to improper initialize of the hardware. See circuit schematic of TPM754.
+
+- http://geekhack.org/index.php?topic=50176.msg1127447#msg1127447
+- http://www.mikrocontroller.net/attachment/52583/tpm754.pdf
+
+
+## Can't read comlumn of matrix beyond 16
+Use `1UL<<16` intead of `1<<16` in `read_cols()` in **matrix.h** when your columns goes beyond 16.
+
+In C `1` means one of **int** type which is **16bit** in case of AVR so you can't shift left more than 15. You will get unexpected zero when you say `1<<16`. You have to use **unsigned long** type with `1UL`.
+
+http://deskthority.net/workshop-f7/rebuilding-and-redesigning-a-classic-thinkpad-keyboard-t6181-60.html#p146279
+
+
+
+## Pull-up Resistor
+In some case converters needed to have pull-up resistors to work correctly. Place the resistor between VCC and signal line in parallel.
+
+```
+Keyboard Conveter
+ ,------.
+5V------+------|VCC |
+ | | |
+ R | |
+ | | |
+Signal--+------|PD0 |
+ | |
+GND------------|GND |
+ `------'
+R: 1K Ohm resistor
+```
+
+
+## Arduino Micro's pin naming is confusing
+Note that Arduino Micro PCB marking is different from real AVR port name. D0 of Arduino Micro is not PD0, PD0 is D3. Check schematic yourself.
+http://arduino.cc/en/uploads/Main/arduino-micro-schematic.pdf
+
+
+
+## Bootloader jump doesn't work
+Properly configure boot section size in Makefile. With wrong section size bootloader won't probably start with **Magic command** and **Boot Magic**.
+- https://github.com/tmk/tmk_keyboard#magic-commands
+- https://github.com/tmk/tmk_keyboard#bootloader
+
+```
+# Boot Section Size in *bytes*
+# Teensy halfKay 512
+# Teensy++ halfKay 1024
+# Atmel DFU loader 4096 (TMK Alt Controller)
+# LUFA bootloader 4096
+# USBaspLoader 2048
+OPT_DEFS += -DBOOTLOADER_SIZE=4096
+```
+http://geekhack.org/index.php?topic=12047.msg1292018#msg1292018
+
+
+## Special Extra key doesn't work(System, Audio control keys)
+You need to define `EXTRAKEY_ENABLE` in **makefile** to use them in TMK.
+```
+EXTRAKEY_ENABLE = yes # Audio control and System control
+```
+http://deskthority.net/workshop-f7/tmk-keyboard-firmware-collection-t4478-60.html#p157919
+