2 RS232 ports and one serial port control program has two parallel lpt. Program of Visual Basic 6 source code (. VBW,. VLPs,. Frm,. FRx, etc …) and Proteus isis’s application circuits. Visual Basic 6 Circuit Proteus Isis Isis... Electronics Projects, RS232 LPT Port Visual Basic Program Proteus isis Circuits "electronics software tools, " Date 2019/08/02