Chosen Solution
the keyboard has a switch to switch from pc xt to pc at. the keyboard works on an xt computer. when connected to the at motherboard and the board is powered up i can tap the caps lock and the caps lock led comes on and off as i tap it, but, when the screen shows keyboard error after booting up i can tap the caps lock and it will not change the condition of the led. also, as the computer is powering up i can see data on the data pin of the keyboard if i am tapping any key but when the screen says keyboard error no matter which key i hit no data blip appears on the oscilliscope screen. so it appears the keyboard only outputs data untill the computer has finished its boot. i am stuck with a screen saying keyboard error, hit f1 to continue. and if i hit f1 nothing happens.
I would guess either the din connector or possibly a capacitor may be bad. In my experience with tech prior to 2002 capacitors are often no longer working which can cause ports to not transfer data fully but still transfer power.
