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AX = 1684h BX = 002Bh (virtual device ID for VCOMM device) (see #02642) ES:DI = 0000h:0000h
Return:
ES:DI -> VxD API entry point (see #02670) 0000h:0000h if the VxD does not support API in current mode
See Also: AX=1684h"DEVICE API" - INT 20"Windows"
(Table 02670) 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 transmitReturn:
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 maskReturn:
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=1Return:
AX = status EAX high word may be destroyed 000Ch "ReadComm" EBX = handle??? CX = number of bytes to read ES???:DI -> bufferReturn:
AX = status ??? ZF = ??? 000Dh set ??? callback EBX = handle??? CX = ??? DX = ???Return:
AX = status??? elseReturn:
AX = 0000h
See Also: #02669 - #02671
Category: Windows - Int 2Fh - M
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