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The Intel Manual States that "The P6, Pentium and i486 family do not generate this exception" (referring to the Interrupt 9, Coprocessor Segment Overrun)... ...yet that is exactly what my machine is givving me. What's even stranger is that I do not even have isr9 marked as "present". Anyone know why this could be??

If a non-present interrupt is occuring then you've made a typo in your code and mismapped or are misprinting a GPF (8) as Interrupt 9 or so on. Possible programming flaws aside, IRQ1 is at INT9 by default IIRC, which is the keyboard.