I made some trials with 50, 250 and 500 cycles. Results are just the same. Here an exerpt of the log with 50 cycles: 10003490.891 [10057098] rx interrupt off. 10003490.891 [10057098] read 0x50 from RHR. 10003490.945 [10057098] rx 0x47 (G) 10003490.945 [10057098] rx interrupt on. 10003491.091 [ …

When I run the PC with MS-DOS the operation speed is similar, when I adjust DOSBox to about 10500 cycles. I just compare the compilation times of a Lauer project, when compiling with MS-DOS against DOSBox. So I make then some trials according to your suggestion with less than 1000.

Even with the latest SVN version the communication fails. This time I used the serial log from DOSBox. Here an exerpt of the results: Com Port is configured by Lauer program: 148271.885 [ 156957] New COM parameters: baudrate 9600, parity even, wordlen 8, stopbits 1 148271.886 [ 156957] write 0x 3 to …

Ok then. I am going to try with SVN r3829. Does this release include all improvements of Megabuild 6 from H-A-L 9000? Does somebody know a similar "portmon" program for DOS ?

I investigated a little more by using portmon. I observed following: When DOSBox is opening the serial port it will be adjusted to: 62 14:57:33 DOSBox.exe IOCTL_SERIAL_SET_BAUD_RATE Serial0 SUCCESS Rate: 9600 63 14:57:33 DOSBox.exe IOCTL_SERIAL_CLR_RTS Serial0 SUCCESS 64 14:57:33 DOSBox.exe IOCTL_ …

In the configuration I have written serial1=directserial realport:COM1. That's how it is described in the DOSBox wiki. Is there something more I can adjust?

So, finally I could find time to try a download to the Lauer PC via DOSBox by observing the COM port with portmon. The only thing I could see was that the Software within DOSBox is setting up the COM port and then waits for a respond of the Lauer PC. But Lauer is not responding or DOSBox is not …

Hi Jorpho, I have already tried by increasing and decreasing the speed of the program without success. The program is setting the data/parity/stop bits internally. So they must be correct. I only can choose the com port in the program. Maybe Portmon reveals something. I continue working on this a …

Thank you both for your answers. So, now I tested everything with the latest DOSBox version. Unluckily it is not working, too. Yes, the device is working properly, because with DOS the download worked. When I try to download the project with DOSBox, I always get overrung error at RX and TX. I …

Even when I use a PC with a real com port, I do not get answer from the Lauer PC. I am using DOSBox version 0.73. Would it help to use the latest version?

Have there been any progress in this topic. I am asking, because I am facing the same problem.