IBM Model M SSK can't register combination keys

light655

06 Jul 2021, 03:04

I found a weird behavior of my IBM Model M SKK, if I press certain key combination at the same time, the key's wouldn't register. I don't think this is to do with 2KRO, since the combination I'm having issues with are like "Left-Control" + "F". When I press these two keys together, only the first key will register. Both of the keys will register when pressed individually, and if I press "Right-Control" + "F" together, both keys will register.
Image

There are several combinations don't register:
"Left-Control" + "R" or "T" or "F" or "G" or "V" or "B"
"Right-Control" + "V"
"Right-Shift" + "V"
If I found more I will update the list.

Does any one experienced something similar? Everything was working just fine last week though.

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