NMB Keyboard not working

[daguil68367]

Hello! I recently bought a 2nd-gen NMB AT keyboard, and after plugging it into my AT to PS/2 adapter and my active PS/2 to USB adapter, it doesn't work. Neither of the adapters are the problem, since I tested them with another AT keyboard and a Logitech PS/2 keyboard.

The lock lights work, and toggle between on and off, but typing text does nothing whatsoever. Would anyone know why this is the case?

[John Doe]

Nobody could give an answer if asking question like this.

Atleast give some info like keyboard photo, better PCB photos.

Protocol compatibility is the cause I guess.

[daguil68367]

You were right, it was XT instead of AT.