DOS ain't dead - problem setting DOSBOX X com and lpt on Lubuntu

iw2evk

Magenta (Italy),
02.09.2023, 18:40
(edited by iw2evk, 03.09.2023, 11:02)

problem setting DOSBOX X com and lpt on Lubuntu (DOSX)

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

bocke

04.09.2023, 00:16

@ iw2evk

problem setting DOSBOX X com and lpt on Lubuntu

Post reply

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

Rugxulo Usono, 04.09.2023, 05:39 @ iw2evk	problem setting DOSBOX X com and lpt on Lubuntu Post reply
	Perhaps this recent freedos-user thread will help? [Freedos-user] USB serial & DOSBox (Bryan Kilgallin, 24 July 2023)

iw2evk

Magenta (Italy),
04.09.2023, 08:29

@ Rugxulo

problem setting DOSBOX X com and lpt on Lubuntu

Post reply

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..

bocke

11.09.2023, 15:42

@ Rugxulo

problem setting DOSBOX X com and lpt on Lubuntu

Post reply

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.

bocke

11.09.2023, 15:50

@ bocke

problem setting DOSBOX X com and lpt on Lubuntu

Post reply

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.

iw2evk Magenta (Italy), 12.09.2023, 08:35 @ bocke	problem setting DOSBOX X com and lpt on Lubuntu Post reply
	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.

bocke 12.09.2023, 16:18 @ iw2evk	problem setting DOSBOX X com and lpt on Lubuntu Post reply
	> > 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

iw2evk Magenta (Italy), 13.09.2023, 08:40 @ bocke	problem setting DOSBOX X com and lpt on Lubuntu Post reply
	Ok, asked as "request of enanchement" > > You might try posting an issue on DOSBOX-X GitHub: > https://github.com/joncampbell123/dosbox-x/issues