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

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INT 2F - Multiplex - AVATAR.SYS - QUERY DRIVER STATE
        AX = 1A3Fh (AL='?')
        ES:DI -> buffer
        CX = length of buffer in bytes
Return: CF clear
        CX = actual size of returned info
Note:   the returned information consists of multiple letters whose meanings
          are described under AX=1A21h
SeeAlso: AX=1A21h

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