INT 21 - DOS 2+ - GET DOS VERSION

Input

 DOS1 N DOS2 Y

DOS3

 Y DOS5 Y

Output

AX

 30h   Minor Version Major Version AX

BX

     OEM Number User Number (hi) BX

CX

     User Number (low 16 bits) CX

DX

         DX

ES:DI

     CF 
OEM Number:     00h = IBM
                16h = DEC


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