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Microsoft Windows - VDD - VxD SERVICES

VxD = 000Ah

Note: The desired VxD and service number are identified by the data immediately following the INT 20 instruction, as in: INT 20h DW service number DW VxD identifier

See Also: INT 2F/AX=1684h"DEVICE API" - INT 30"Windows" - #01265 - #01340

(Table 01273)
Values for VDD (VxD ID 000Ah) service number:
00h    get version
01h    PIF state
02h    get GrabRtn
03h    hide cursor
04h    set VM type
05h    get ModTime
06h    set HCurTrk
07h    message clear screen
08h    message foreground color
09h    message background color
0Ah    message output text
0Bh    message set cursor position
0Ch    query access
0Dh    "VDD_Check_Update_Soon"
0Eh    "VDD_Get_Mini_Dispatch_Table"
0Fh    "VDD_Register_Virtual_Port".
DX = base I/O port number.
CL = number of contiguous ports???
10h    "VDD_Get_VM_Info"
11h    "VDD_Get_Special_VM_IDs".
Return:
ESI = ???
EDI = ???
12h    "VDD_Register_Extra_Screen_Selector"
13h    "VDD_Takeover_VGA_Port".
DX = VGA I/O port number (03C2h, etc.).
ECX -> routine to call on I/O access.
Return:
ECX -> previous handler (to be jumped to at end of new handler)
14h    ???
15h    ???
16h    ...last service for Windows95 SP1

See Also: #01272 - #01274 - #02648

Category: Windows - Int 20h - M

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