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What is REVB and REVQE LED Expantion?

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I see it a lot on keyboards. Wondering what it was/what goes in the slot. i.e.
https://www.massdrop.com/buy/xd84-custom-mechanical-keyboard-kit
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oldskulrulz
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Mar 5, 2018
Wait while all images loaded on this page: http://forum.eepw.com.cn/thread/284531/1#4 Worth waiting then download all 4K high quality photos! ;)
Ctrl+F, type "row"
Here is a Google-than-me translated description:
You can connect extra buttons in a 6x4 matrix (for example a numpad): 1st pin is the top square-shaped one:
- pins 1-6: ROW0-ROW5 - pins 7-10: EXCOL1-EXCOL4 - pin 11: D1 - LEDs - pin 12: VCC - pin 13: GND
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