Opening a COM port in QBasic on Windows 7

I'm having difficulty opening a COM port in QBasic (obtained from www.qbasic.net) like so

OPEN "COM4:9600,N,8,1,BIN" FOR OUTPUT AS #1

However when I execute this statement in QBasic the open keyword is highlighted and I get the error message Bad file name.

Is Com4: one of the available serial ports? Look in control panel and make it is one of the available ports. Also, you must make sure no other programs have the port open.

How to check which application is using which port, How do I check my COM ports in Windows 7 using CMD? Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Learn more Opening a COM port in QBasic on Windows 7

The following works FreeBasic

Open Com "COM1:9600,N,8,1" As 1

I recommend the FreeBasic IDE FBIde.

Command for opening serial port in Windows 7, number that you want to check and hit enter. Is there a DOS command for opening serial ports, say COM3 via the DOS command prompt in Windows 7. For example: OPEN "COM6" AS #1 I cannot use pyserial or any other utilities that are not distributed with Windows 7. Preferred solution Opening a COM port in QBasic on Windows 7. Practice As Follows. Maybe you can use the Powershell? It’s

"COM4:9600,N,8,1,BIN"

The semantics for opening files changed in Win2K. On NTFS, the colon indicates an Alternate Data Stream, and the DOS use of the colon when opening serial devices was not implemented.

So on Win7, "COM4:9600,N,8,1,BIN" is a bad filename.

OPEN COM, I cannot use pyserial or any other utilities that are not distributed with Windows 7. Preferred solution Opening a COM port in QBasic on Windows 7. Switching to Windows 10 is neither a solution nor an option. It is *less* likely to work. I, my co-workers, and very importantly our IT support team, are all sticking to this windows 7 ship until it sinks and we have no choice but to upgrade. If it ain't broke, don't fix it. So, looking for a solution to my serial port problem on this OS

OPEN COM Statement, OPEN COM Statement Opens and initializes a communications channel for input or The OPEN COM statement must be executed before a device can be used for communication using an RS232 interface. 6, 7, 8 stop is the number of stop bits: 1, 1.5, 2 Defaults: 300 baud, even parity, QBasic with Windows; Games▽. QBasic could only open COM1 or COM2, but 3 and 4 could be swapped. See Windows System Device Manager for COM port numbers and port addresses &H3F8, &H2F8, &H3E8 and &H2E8. Four commas are required after the Speed, Parity, Bits, and Stopbit, even if none of the Options are used.

Serial communication port, QBasic Code for photobooth fundraiser , OPEN "com1: 300, n, 8, 1,cd0,cs0,ds0,op0,rs,rb2048" FOR INPUT AS #1 time I tried it, but never since and I have tried this on 3 different PC's. Opening a COM port in QBasic on Windows 7. I recommend the FreeBasic IDE FBIde. Browse other questions tagged serial-port qbasic or ask your own question. FreeBASIC is a self-hosting compiler which makes use of the GNU binutils programming tools as backends and can produce console, graphical/GUI executables.

QBasic Serial Ports, However QB fails the OPEN routine with a Device Timeout Error. Am I overlooking Vernon Frazee, Microsoft MVP (Windows - Shell/User) Defenses Up! For a 9-pin Serial Port that would be pins 7, 8 and 9. For a 25-pin  I thought to make a Qbasic tutorial but instead I created this video, people always encounter problems when running Qbasic on windows 7, normally they use Dosbox, but I don't always prefer it, all

Comments
  • QB only supports COM1: and COM2:
  • Odd, I'm able to open any port on my machine. Even COM30!
  • What version of QB are you using?
  • Try the latest version.
  • This link describes why QB only has COM1: and COM2: qb64.net/wiki/index.php/OPEN_COM
  • COM4 is available and can be written to. Other applications routinely use it, althout none does at the time I run the QBasic program.