This evening I set out to do a little more work toward adding programmability to the
XT to USB adapter, and discovered that my PC Model F is sending copious streams of spurious characters from the lower left region of the keyboard — mostly but not necessarily exclusively F8, F9, F10, Alt, Shift, /, Z, Control, and Q. I now fear I may have accidentally damaged it when I removed it from its case to
take pictures recently. Can anyone offer any insight into this failure?