It should be at `/dev/ttyUSB0` and you should refer to realport `ttyUSB0` or something like that (`serial1=directserial realport:ttyUSB0`). This article ( https://www.cyberciti.biz/faq/find-out-linux-serial-ports-with-setserial/) gives a good example of how to manage serial ports (including USB connected) in Ubuntu.
This article (https://www.scivision.dev/dosbox-linux-serial-port/) gives additional tips on how to set up serial ports for DOSBox on Linux. On Mon, Jul 24, 2023 at 6:32 PM Bryan Kilgallin via Freedos-user < freedos-user@lists.sourceforge.net> wrote: > My heart monitor is an old Polar Sport Tester 4000. > https://www.manualslib.com/manual/1393035/Polar-Electro-Sport-Testert.html > > Its interface box has an RS2323 socket. > > I had been downloading data to an old PC with a serial port. That PC > runs FreeDOS. VER/R reports "DOS version 7.10". > > My Ubuntu PC does not have a serial port. > > But I have a Belkin F5U409 USB-serial adaptor. My Linux kernel is > 5.19.0-50-generic. > > {The device is supported by kernel versions 2.6.0 and newer according to > the LKDDb: > > Ver Source Config By ID By Class > 2.6.0 - 6.3 drivers/usb/serial/mct_u232.c CONFIG_USB > CONFIG_USB_SERIAL > CONFIG_USB_SERIAL_MCT_U232 050d:0109 *} > > https://linux-hardware.org/?id=usb:050d-0109 > > That adaptor's LNK LED is on (green). > > The Ubuntu PC has DOSBox v0.74-3. It runs the POLAR software OK. That > can set serial port to COM1 or COM2. > > DOSBox Wiki says this. > > {Configuration:SerialPort > Jump to navigation > Jump to search > > serialX = device [parameter:value] > > device can be: dummy | modem | nullmodem | directserial > parameter is: irq > value is: > > for directserial: realport (required), rxdelay (optional). > for modem: listenport (optional). > for nullmodem: server, rxdelay, txdelay, telnet, usedtr, > transparent, port, inhsocket (all optional). > > Defaults: > serial1=dummy > serial2=dummy > serial3=disabled > serial4=disabled > > An example of how to configure an actual serial port for I/O use: > > serial1=directserial realport:com1} > > So in DOSBox, I enter that last line. > > Then I launch the POLAR software. > And I check its default serial port: > "THE SELECTED SERIAL PORT FOR HR INPUT IS: COM1". > > Then I instruct the heart monitor to transmit data. And the adapter's RX > LED illuminates red. But the POLAR software fails to detect data! > > Please advise. > -- > members.iinet.net.au/~kilgallin/ > > > _______________________________________________ > Freedos-user mailing list > Freedos-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freedos-user >
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