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Need some help troubleshooting a 486 board with a dead keyboard port *or something

Hey everybody, got back in the hobby again and decided to revisit an old project of mine. I’ve got this UM8810PAIO rev 2.1 board I got ages ago as my first ever retro pc purchase. I remember doing some testing with a torn apart keyboard and something went wrong, the board made a lot of unhappy beeps …

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