Int 21/AH=64h/DX=0007h

OS/2 v2.1+ Virtual DOS Machine - GET WinOS2 CALL GATE ADDRESS

AH = 64h
DX = 0007h (function number)
CX = 636Ch (magic value, "cl")
BX = 0000h (indicates special request)

Return:
AX = call gate address

Notes: If CX is not 636Ch on entry, INT 21/AH=6Ch is invoked, because a bug in OS/2 1.x FAPI erroneously called AH=64h instead of AH=6Ch. Used by WinOS2 to make direct calls to OS2KRNL, bypassing the overhead of DOSKRNL

Category: Other Operating Systems - Int 21h - O

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