See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
### NKRO
* N or 6 Key Rollover NKRO/6KRO
* navigating bios of computer may require 6KRO
* default keymap has fn(T) mapped to toggle NKRO/6KRO
* test: press 8 keys at same time, if 6, then 6KRO, if 8, then NKRO
### DIP switches enable/disable GUI keys, the second keys from the ends on the bottom row:
* K41/K4C are WIN/GUI and will disrupt games;
* Add keycodes GUI_ON and GUI_OFF to your function layer to switch on/off GUI keys. It is eaier than flipping the dip switches;
```
dip keys
#1#2 K41 K4C
1 1 1 1 both keys enabled
1 0 0 1
0 1 1 0
0 0 0 0 both keys disabled
```
### ISP header next to the ATmega32U4:
* if you can't get into bootloader, while keyboard is on, momentary jump pad 5 to pad 6