What did you try so far?

And you can try the improved build on my homepage.

I try it becuase i use this programs to programing Motorolla Radios, and it will be more comfortable to open that programs from windows.
Once i drive to a client with my notebook and i forgot win98 start disc (i have winXP). Thats why i start digging.
Maybe someone knows how to do this in Dos Box?

So did you open the dosbox.conf and change the serial1=...?

I've change it for something like that:
serial1=directserial realport:com1
But when i try to comunicate:
Serial port at 3f8:Opening COM1
Serial port at 3f8:RX Overrun!
It seems that XP is blocking that port.

Maybe i do somethin wrong? 😀

I just saw your web page. Itry it with your's patch. 😉

try to increase cycles too.

hi i am attempting the same thing, had the original error with the serial port but with the patch i am getting a new set of errors:
Serial1: Opening com1
Serial1: Errors occured: Framing 0, Parity 0, Overrun 6, Break 0
Serial1: Errors occured: Framing 0, Parity 0, Overrun 9, Break 0

Try cycles=10000 or more with core=dynamic

I try it with your patch and it the same:
Serial1: Opening com1
Serial1: Errors occured: Framing 0, Parity 0, Overrun 10, Break 0
Serial1: Errors occured: Framing 0, Parity 0, Overrun 10, Break 0
I increase and decrease framing and cycles and it the same.
I even change value of com1 in cmd and still nothing.

I'm just stupid 🙁

How fast is your processor?

a 1.8 ghz
1 gig ram

Somehow the interrupts are disabled too long (tested with a game that produces overrun errors).

But question.
It can be done or give it up?

Try this

http://home.arcor.de/h-a-l-9000/dosbox_files/ … d_async_int.zip

Maybe also try
serial1 directserial realport:comx rxdelay:100
if it doesn't work on its own.

It's not working but thaks for your help.

Bye.

any chance you can still work on this?

Well I don't have the thing and thus can't debug it. You could try the latest CVS as it has my latest serial port code. And try to boot DOS in DOSBox maybe it helps. Could also be that it's not the serial port that causes problems but some INT call that should set the interrupt flag but doesn't.

Hi hal, i have almost the same problem, i am using a software for an interface that needs to run on a CPU max 200 Mhz. I have downloaded the latest dosbox 0.65, edited the conf. file. to
serial1=directserial directport:com2
serial2=dummy
...
....

the program runs over com2.

i only have com1 on my laptop so i redirected the com1 to com2 in win XP.

runnin with core=normal and cycles=3000 (standard)

what more can i try?

The software says "connect the cable......"

Any suggestions?

I don't know much about this redirection of serial ports in WinXP, so I could be wrong, but ....

Drop the redirection in WinXP and let DOSBox do the redirection:

serial1=dummy
serial2=directserial directport:COM1

When the program inside DOSBox tries to talk to COM2 (serial2) DOSBox will redirect it to the real COM1 (I think).