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AH = 64h DX = 0003h (function number) CX = 636Ch (magic value, "cl") BX = 0000h (indicates special request)
Return:
AL = highest drive supported
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. Not supported by OS/2 Warp 3.0, check list of lists instead (see #01627)
See Also: AH=52h
Category: Other Operating Systems - Int 21h - O
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