DOS ain't dead

Hi all,
i've installed dosbox x on lubuntu 20.04
i've some problems with com and lpt1 ports.
I use usb ports on my O.s. (usb0)
On my config file i've called

serial1 = directserial realport:COM1 realport:usb0
serial2 = directserial realport:COM2 realport:usb0

and lpt1 for use with a eprom programmer

parallel1 = Reallpt:LPT1 realport:/dev/usb0

i receive this error on log.txt

Serial1: BASE 3f8h
Serial1: Opening COM1
Serial1: Serial Port "COM1" could not be opened.
System error 9.
Serial2: BASE 2f8h
Serial2: Opening COM2
Serial2: Serial Port "COM2" could not be opened.
System error 9.
Invalid type for LPT1.

Where is the error ?

Thanks

Roberto

What exactly are you trying to do? Access USB to serial and USB to parallel adapters via DOSBOX-X?

It's likely you are entering the wrong parameters. COM1 and COM2 don't exist in Linux.

What might exist depends on the kind of serial adapter. Is it a physical adapter? Is it USB to serial adapter?

COM1 would traditionaly be /dev/ttyS0.
USB adapter might have the name similar to /dev/ttyUSB0.
PCI(Ex) to serial adapters would have /dev/ttySx, where x is the number after the builtin serial ports on the motherboard.

Edit:

This means... For USB to serial, you should try something along these lines:

serial1=directserial realport:/dev/ttyUSB0

Perhaps this recent freedos-user thread will help?

[Freedos-user] USB serial & DOSBox (Bryan Kilgallin, 24 July 2023)

Ok,
i've setting in doxbox x the 2 com port using linux usb port

serial1 = serial1=directserial realport:ttyS0
serial2 = serial1=directserial realport:ttyS0

seem working

Serial1: BASE 3f8h
Serial2: BASE 2f8h

now i want to redirect the lpt1 on dosbox x to usb port on linux.
At this port i want to connect a usb to lpt adapter for controlling a dos eprom programmer using lpt port.
On my notebook i don't have any lpt port..
I've setting in cfg file

parallel1 = parallel1=reallpt realport:ttyS0

but ...

Invalid type for LPT1.
MPU-401 Registering I/O ports as if IBM PC MPU-401 at base 330h

i've also added in linux my user to group Lp without result..

So, you can just name the device and not the full path? That's useful to know. I might need it soon.

For LPT... Under Linux LPT is lp, but the counting goes from 0, not 1. So:

LPT1 = lp0
LPT2 = lp1

and so on.

According to this link, they would also be available under:
/dev/parportn (/dev/parport0)

So, if you have builtin parallel port on mb, you can try using parport0.

USB printer connected via USB to LPT would be /dev/usb/lp0. But according to this link, it will also be avialable as /dev/usblp0 so I guess you can use usblp0 in this case.

What I linked above is a page about a printer setup from dosbox-x site. It gives the following example:

[parallel]
parallel1=reallpt realport:/dev/parport0

Although they note that your username should also be in the 'lp' user group. If it isn't you can try adding it via usermod:

sudo usermod -a -G lp username


They also note:

"in the case of a USB parallel port adapter the first parallel port will be /dev/usblp0, but it is unclear if a USB parallel port adapter will work".

So YMMV with USB to LPT adapters.

Hi

>
> "in the case of a USB parallel port adapter the first parallel port will be
> /dev/usblp0, but it is unclear if a USB parallel port adapter will
> work".
>
> So YMMV with USB to LPT adapters.

i've tred the suggested setting but not work :

Serial1: BASE 3f8h
Serial2: BASE 2f8h
Invalid type for LPT1.

>
> i've tred the suggested setting but not work :
>
> Serial1: BASE 3f8h
> Serial2: BASE 2f8h
> Invalid type for LPT1.

I'm sorry I don't currently have USB to LPT adapter or a parallel printer to test.

You might try posting an issue on DOSBOX-X GitHub:
https://github.com/joncampbell123/dosbox-x/issues

Ok, asked as "request of enanchement"
>
> You might try posting an issue on DOSBOX-X GitHub:
> https://github.com/joncampbell123/dosbox-x/issues