For your amusement, here is a screenshot (large file):
http://www2.netdoor.com/~tclay/snapshot-trlinux.jpg
Torsten
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DOSemu/Linux/TRlog Notes 11/08/03
Torsten Clay N4OGW
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1) Installing DOSemu
This may already be installed on your system. I installed it from
source, using Dosemu version 1.1.99.1 (latest stable release)
a) Get the following from www.dosemu.org:
dosemu-1.1.99.1.tgz
dosemu-freedos-b9-bin.tgz
put them in a scratch directory
b) unpack source:
tar xzvof dosemu-1.1.99.1.tgz
c) rename the Freedos file, and put it in the source directory:
mv dosemu-freedos-b9-bin.tgz dosemu-1.1.99.1/dosemu-freedos-bin.tgz
d) configure and make:
cd dosemu-1.1.99.1
./configure
make
e) as root,
make install
2) Configuring DOSemu
You need to make some changes to /etc/dosemu/dosemu.conf in order to
get port access. Here is what I changed in that file. In the default file,
the following were either not present, or were commented out (# character).
a) I turned on the Pentium cycle counter option. Maybe not needed, but I
figured that since timing is critical to TRlog, this might help.
$_rdtsc = (on)
b) You can set the amount of CPU DOSemu gets. A setting of 0 is the maximum,
1 is the default. I tried both, and they seemed to work equally well on
my system.
$_hogthreshold = (0)
c) Set up serial ports:
$_com1 = "/dev/ttyS0"
$_com2 = "/dev/ttyS1"
d) Set up printer port. This is for the 1st printer port:
$_ports = " device /dev/lp0 fast range 0x378 0x37a"
e) Set up IRQ passing. IRQ 7 is for the printer port:
$_irqpassing = "7"
3) Running TR
Start a DOSemu session (under X) with xdosemu. I had more success running
under X than at the console. On the console, the screen size came up
wrong. You will probably want to run xdosemu as root (see below).
The first time dosemu runs, it asks you where the DOS image is. If you
downloaded the freedos file correctly, just hit enter. Then you will
get a C: prompt.
This is how dosemu stores its files: it makes a directory ~/dosemu, which
contains all of the "C:" drive. There is probably a way to access other
files on the system, I haven't figured that out yet. Anyway, the
directory ~/dosemu/freedos corresponds to C:. From linux you can copy
files into this directory.
With the ~/dosemu/freedos directory, I made a directory for TR, copied
the zip file there, and unzipped in with unzip.
Now in the dosemu window, cd tr, and run it!
4) Ports and root:
There are two ways I tried running dosemu: either with 'sudo', or as
root.
a) sudo: This is a better method (you don't have to run fully as root).
Using visudo, add a line like this:
tclay ALL=(root) NOPASSWD: /usr/local/bin/dosemu.bin
Then copy the dosemu.users.example file found in /etc/dosemu to
/etc/dosemu/dosemu.users, and add the line:
tclay c_all
Now when you run xdosemu, it drops the root privledges after starting.
I was able to access the serial ports this way, but was not able to
get access to the parallel port. You may need to add yourself to the
right group to get serial access. I'm not sure how to get parallel
port access this way.
b) running as root. Do 'su' before running xdosemu. More potential
for danger, but so far this is the only way I've been able to get
the parallel port interface to work.
5) Further notes.
Control keys: your windowmanager may intercept some of the Alt+...
combinations, preventing them from getting to TR. You will have to
tell the window manager to use some other combination. The way to do
this is different, but there should be a config setting for this
for most window managers.
The time in DOSemu comes up as local time, assuming the usual linux
setup where your computer hardware clock is in UTC, and you have the
timezone set. To get the DOSemu clock in UTC, just use the DOS date
and time commands within the dosemu window.
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