Serial in guest os is too fast

Discussions related to using VirtualBox on Windows hosts.
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dnordenberg
Posts: 7
Joined: 3. May 2021, 14:28

Serial in guest os is too fast

Post by dnordenberg »

Hi!
I'm running a dos software under a windows XP guest. It sends like 100kb data to a serial device. From what I managed to understand about the problem myself is that it is probably timing related. The dos software finished almost instantly sending the data and then it waits a period for a OK from serial device before sending some more data. But while the dos program thinks it is finished the data is buffered (in host os end?) and slowly sent to the serial device, guest os/dos program seems to have no knowledge about this and after a while the dos program makes a timeout waiting for a OK from the serial device (while data is still flowing to the serial device).
Can I turn off this buffering so guest os/the dos software can only send data in realtime to the device? Software runns perfectly under a physical windows XP and this buffering does not seem to happen then, you can then watch the data counter follow the the real progress all the way to the finish.

Kind regards
David
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