Int 2F Fn 1684  - Ms Windows - Vcomm - Get Api Entry Point                 [W]

   AX = 1684h
   BX = 002Bh (virtual device ID for VCOMM device) (see #2329)
   ES:DI = 0000h:0000h

Return: ES:DI -> VxD API entry point (see #2357)
         0000h:0000h if the VxD does not support API in current mode

See Also: AX=1684h"DEVICE API",INT 20"Windows"

(Table 2357)
Call VCOMM.VXD entry point with:
   AX = function number
       0000h open COM/LPT port
       BX = port number (00h-7Fh = COMx, 80h-FFh = LPTx)

       Return: DX:AX = handle???
       0001h set comm state
       ???

       Return: AX = ???
       0002h setup comm port
       ???

       Return: AX = status (0000h failed, FFFFh success)
       0003h transmit character
       EBX = handle???
       CL = character to transmit

       Return: AX = status???
       0004h close comm port
       EBX = handle???

       Return: ???
       0005h clear comm error
       EBX = handle???
       EAX = ???

       Return: AX = status???
       0006h "EscapeCommFunction"
       EBX = handle???
       CX = ???
       EAX = ???

       Return: DX:AX = ???
       0007h purge buffers
       EBX = handle???
       CX = ???

       Return: AX = status???
       0008h set comm event mask
       EBX = handle???
       CX = new event mask

       Return: AX = status???
       0009h get comm event mask
       EBX = handle???

       Return: AX = current event mask
       000Ah ???
       EBX = handle???

       Return: ???
       000Bh "WriteComm"
       EBX = handle???
       CX = number of characters to write
       ES???:BX -> buffer (if CX > 1)
       SI??? low byte contains character if CX=1

       Return: AX = status
           EAX high word may be destroyed
       000Ch "ReadComm"
       EBX = handle???
       CX = number of bytes to read
       ES???:DI -> buffer

       Return: AX = status ???
           ZF = ???
       000Dh set ??? callback
       EBX = handle???
       CX = ???
       DX = ???

       Return: AX = status???
       else

       Return: AX = 0000h

See Also: #2356,#2358