[COLUG] Dosbox serial ports Dosemu (more)

[charles morrison]

charles morrison wrote:
> /It is not really hard to setup dosemu.   I've used it with a couple 
> of apps
> that make use of serial devices both normal and usb based.  Like you 
> said,
> for non-game apps it is the better choice.
>
> Pat/
> /
> /I decided to try Dosemu since it had a configuration file which would 
> allow me to set up the com port of my choice, used as COM1/2.
>
> Dosemu recognises the com port but nothing goes out the port.
>
> I have modified my udev file to detect when this USB to serial cable 
> is inserted, and renamed the port as COM1. When the renaming occurs 
> the port is configured as:
>
> crw-rw---- 1 root   dialout 188,   0 2007-12-05 15:37 COM1
>
> When Dosemu starts, it recognises this port. I can tell because I set 
> COM2 to the same port and Dosemu said that the port was already in use 
> for COM2 and refused to use it. I also get a message when I set it to 
> an invalid port which states the port is not present. On COM1, I get 
> no error message, which says to me that Dosemu recognised the port and 
> that the port is a good one.
>
> Still, I get no blinky lights on my port and my program which is set 
> up to be full duplex thinks it is getting an echo back from a device 
> which is not connected. I have shorted pins 8-9 which are the CTS and 
> RTS pins to make sure handshaking is not a problem.
>
> I have played with the udev file to set other groups and permissions, 
> and anything other than the above causes an error message, such as 
> permission denied.
>
> I really believe I am minutes from having this thing working, but need 
> some ideas on what I can try next, with Dosemu.
>
> Charlie Morrison
>
Well, I did some playing and found that after I fixed the loopback 
wiring on the RS232 side, I then used under Dosemu the command /echo 
(text file) > /dev/COM1/, the data was actually blinking my lights, so I 
know that everything is connected and is recognized by Dosemu, and will 
send data out the port.

I then turned on the debug output and tried it again, and found the 
following line in the ~/.dosemu/boot.log file:

/SER: directory /var/lock namestub LCK.. binary No
SER: /dev/COM1 port 0 int 0/

Later in the boot.log file I have:

/SERIAL $Id: ser_init.c 1769 2007-05-04 05:59:48Z bartoldeman $
registering /dev/COM1 for serial
PKT: Cannot allocate TAP device (dynamic): Permission denied/

My program running under dosemu (which we have used for 10 years under 
DOS) doesn't send anything out the serial port, but an echo > command 
under dosemu works.

Looks to me like the /port 0 int 0/ might be the problem.

Can anyone give me some ideas on what to try next?

Charlie Morrison





-- 
Charlie Morrison
American LED-gible, Inc
1776 Lone Eagle Street
Columbus, OH  43228  USA
614-851-1100
FAX  614-851-1121
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