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Call VCD entry point with

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Data:
EAX = function number
0000h get VCD version
Return: CF - clear
AH = major version
AL = minor version
0001h get ???
Return: CF - clear
AX = bit mask of ???
0002h get ???
  CX = COM port number
Return: CF - clear
DX:AX ???
0003h set ???
Data: CX = COM port number
DX:AX new ???
Return: CF - clear
0004h acquire COM port
Data: AX = ???
CX = COM port number
Return: CF - clear
AX = ???
EBX = ???
DX = ???
0005h release COM port
Data: CX = COM port number
Release: CF - clear
0006h ???
Return: CF - set
AL = 00h
else
Return: CF - set
EAX = FFFFFFFFh
Note: These functions are apparently only available from the system VM, returning CF set and EAX=FFFFFFFFh otherwise.
See Also: #02651,#02653