X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - ctask 2.0

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INT 21 - CTask 2.0 - INSTALLATION CHECK
        AX = 3000h
        BX = 1234h
        DS:DX -> version string??? (8 bytes)
Return: AL = DOS major version
        AH = DOS minor version
        CX:BX -> ???
Notes:  if first eight bytes of returned data block equal eight bytes passed
          in, CTask is resident
        CTask is a multitasking kernel for C written by Thomas Wagner

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