) Call VCD entry point with: EDX = 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 ??? CX = COM port number DX:AX -> new ??? Return: CF clear 0004h acquire COM port AX = ??? CX = COM port number Return: CF clear AX = ??? EBX = ??? DX = ??? 0005h release COM port CX = COM port number Return: 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 SeeAlso: #02651,#02653