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AH = 64h DX = 0004h (function number) CX = 636Ch (magic value, "cl") BX = 0000h (indicates special request)
Return:
AX = number of entries in OS/2 JFT for VDM
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. In an OS/2 VDM, the DOS Job File Table in the PSP contains an index into the OS/2 JFT in the Per-Task Data Area rather than an SFT index because the OS/2 SFT can contain more than 255 entries
Category: Other Operating Systems - Int 21h - O
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