Int 21/AH=64h/DX=0004h

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OS/2 v2.1+ Virtual DOS Machine - GET SIZE OF PTDA JFT

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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