pepeluis wrote:

Maybe this machine use hardware flow control. Can I do anything?
Can I modify the Dosbox program to use hardware flow control?
Is difficult?

What is that "hardware flow control"?

Otherwise:
1. What program is it?
2. Are there any errors reported by DOSBOX?

Mirek

1.- It means CTS/RTS flow control. There was two kinds of flow control with serial ports: Hardware (using CTS and RTS lines) and software (also known as XON/XOFF... you send a XON char, a byte of data and then a XOFF char... repeat ad nauseam). Of course, you may use no flow control... and send all data continuosly.

mirekluza wrote:

What is that "hardware flow control"? […]
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pepeluis wrote:

Maybe this machine use hardware flow control. Can I do anything?
Can I modify the Dosbox program to use hardware flow control?
Is difficult?

What is that "hardware flow control"?

Otherwise:
1. What program is it?
2. Are there any errors reported by DOSBOX?

Mirek

Mirek:

Is a program to configure an Radio Equipment.
The program establish communication with the radio automatically using serial port 1 in my old notebook.
With DosBox I can run the soft but the communication is not establish.
How open the COM 1 port the DosBox? Is possible to modify the programation ? I'm not a programmer, I used to program something in VB6.
I want to test with different combinations RTS/CTS, XonXoff and diferrents baudrates.
Any suggestions is appreciated.

Thanks in advance.

The person who knows most about accessing physical serial port in DOSBOX is its author (CANADACOW). He checks this forum occasionaly.
I have never used this functionality (not having any need for it), so I cannot help you any further...

Mirek

Are you using the right cable? (Connecting 2 PCs requires a different cable than connecting PC with hardware)

Which baud rate, parity, flow control did you use before? did you use sync or async serial communication?