X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 2f - multiplex

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INT 2F - Multiplex - NOTES
        AH = identifier of program which is to handle the interrupt
           00h-7Fh reserved for DOS
           C0h-FFh reserved for applications
        AL is the function code
This is a general mechanism for verifying the presence of a TSR and
communicating with it.

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