Back online
2011-12-28 14:23:04 by demon
after four days off due to power supply failure at holidays
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Papa ist tot.
2011-11-20 06:55:00 by demon
Nach langer Krankheit ist heute morgen mein Papa in Krankenhaus gestorben.
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Updates on DimOS-RT
2011-11-03 00:58:21 by demon
Major update. Finaly managed to fix some nasty timing and stack bugs. Check out CVS for changes.
The whole setup
The system is currently running 8 tasks:
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Thunderbird, shame on you!
2011-07-23 00:52:18 by demon
If your Thunderbird suddendly stops sending emails mumbling something about you don't have enough permissions to access some files or you shall check your network settings, do not listen to it! Just go to C:\Documents and Settings\User\Local Settings\Temp and wipe all its ns*.tmp files!
Here is unambiguous a bug (including last TB 5.0) – if the last file named nsmail-9999.tmp is created, well then TB is doomed.
This little bug ruined an half day of my life.
Links: Bugzilla
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eduroam and wicd
2011-07-15 11:53:05 by demon
Our dear TUBIT changes again everything. Now they abandon one wireless network in favor for an another. Thus, here are instructions, how to access the new TUBIT network using wicd.
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Gollum is dead
2011-06-28 13:39:01 by demon
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Backup Proxmox Containers to FTP
2011-05-26 18:31:32 by demon
Sometimes there is no other option, as using FTP for backup. A quick search through Net gives several solutions, but sadly they are mostly either buggy or ugly. So here is my own.
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Theme tweak and IE
2011-03-29 20:46:52 by demon
Recently I got access to a windows-box and could not resist to check if my tweaked theme still looks good in Explorer, as it does in Mozilla, Chrome and Safari. Well, MS sucks, as usual. Here is a proof:
I was really surprised, that IE still doesn't support hsl definition for colors. Well, dear IE users, go here and do yourself a favor, getting a real browser.
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Migration to Blogsum
2011-03-24 14:38:48 by demon
Finally started a migration from my old good home-brewed page to blogsum.
Since I have the intention to keep things in chronological order, as it was (more or less) on the old site, it will take a while. Sometimes it is difficult to track down exact dates of updates on the old page. But I hope the best.
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Update on DimOS RT
2011-03-11 12:00:00 by demon
Finally managed to check-in the source code into CVS repository. Feel free to dig around.
New 3-wire LCD output driver.
New serial bootloader and according firmware.
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DimOS RT
2011-02-24 12:00:00 by demon
DimOS RT is a preemtive real-time kernel with EDF-scheduling for Atmega microcontorllers It is inpired by the research paper from Dan Henriksson and Anton Cervin
RGB-LED
A test application for Atmega8 at 16MHz: cycle through HSV-values with 5 independent tasks:
- 1x heartbeat
- 1x hsv2rgb converter/feeder
- 3x PWM driver/reader for each color accordingly
The UART 9600,8n1 feeds current running task, although due to its speed limitation it's not in sync with real context switches.
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Visualisation hack for aucat
2010-11-13 12:00:00 by demon
The last release of OpenBSD (4.8) includes a new cool feature: a monitoring mode in its audio daemon aucat(1).
Thus, this little hack visualizes anything, what is being played using this new mode, no matter where the sound data came from.
Browse CVS: src/spectrogram
Used libs: sndio, SDL, fftw3
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AVR SP12 programmer for OpenBSD
2010-01-06 12:00:00 by demon
Port of AVR SP12 programmer to OpenBSD with some impovements and clean-up.
Requires kern.securelevel ≤ 0 or machdep.allowaperture > 0 (see sysctl(3) for details)
Browse CVS: src/sp12
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tallyman
2009-10-28 12:00:00 by demon
With tallyman you are able to transfer one or many users or even resellers with all its sub-users from one paralells virtuozzo server to another. You can either do the transfer manually by looking for all required database entries, user files, database files, users emails, settings and configurations or let tallyman do it for you. tallyman takes also care about possible collisions on the target system and warn you if there are some.
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xlinux - greetings from the year 1996
2009-10-18 12:00:00 by demon
It was 1996 as I met linux first time. Now 13 years later I found it again on an old CD and could not resist to temptation to run it again. Thus if you like play with it too, you can get it either from the net or get it as ready-to-run qemu image here [27M]
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utah teapot, xterm and tektronix 4014
2009-02-11 12:00:00 by demon
Some experiments with xterm's Tektronix capabilities
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xterm colors
2008-07-17 12:00:00 by demon
some xterm colors I use time-to-time
| name | fg | bg |
|---|---|---|
| amber | #ff7f00 | #1f0000 |
| green | #00df1f | #001f00 |
| blue | #ffffff | #003f7f |
| yellow9 | #000000 | #ffffea |
| blue9 | #000000 | #eaffff |
| vms | #fffbf0 | #008080 |
| hpux | #ffffff | #686f81 |
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Turing Machine
2007-11-22 12:00:00 by demon
everyone wrote one, me too.
A result of some studies: a turing machine with infinity tape
Browse CVS: src/turing
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dumped pendulum
2007-02-03 12:00:00 by demon
visualization of differential equation set:
you may wish to take a look at HQ [18.5MB] or LQ [4.8MB] animation, source code and presentation
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OpenBSD rlimit LKM
2005-09-13 12:00:00 by demon
This simple module fakes RLIMIT_AS as required by some bogus Linux apps.
- Browse CVS: src/lkm/rlimit
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watch
2005-02-27 12:00:00 by demon
Execute program periodically, showing output fullscreen. A free counterpart to GNU watch.
- Download: watch-2.1.tar.gz [4KB] - MD5
- OpenBSD port: watch-port.tar.gz
- Browse CVS: src/watch
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simple bootmanager
2004-09-05 12:00:00 by demon
A simple bootmanager for x86 inspired by Booteasy and OpenBSD MBR code.
- Download: boot.tar.gz [8KB] - MD5
- Browse CVS: src/boot
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Anonymous CVS
2003-06-06 12:00:00 by demon
CVSROOT=anoncvs@cvs.dim13.org:/cvs
- password: anoncvs
- protocol: ssh
alternatively you can also use WebCVS frontend
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Who am I
1978-11-10 11:00:00 by demon
Dimitri A. Sokolyuk
alias dima alias demon alias beastie alias quax
if you have any questions, feel free to drop me a mail
- eMail: demon@dim13.org
- PGP: 0x5A7C3054 (FP: D712 C0F2 C647 0FA4 FC48 7018 31C8 B85F 5A7C 3054)
- ICQ: 167296771
- Skype: beastie78
- Mobil: +49-151-22840797
Once upon a time...
before Internet became common there was an another net — the FidoNet. At that glorious time I was also known as
- 2:245/6666.58 at TCIYF! BBS in Kaiserslautern
- 2:2410/218.11 at NAISSUR BBS in Berlin
- 2:2411/814.11 at FriendsNet in Berlin
You could also have met me as dreamdemon on irc.stealth.net at the #MbI channel in the late 90's. Now you can also find me on the reincarnation of the same channel at IRCnet.
What I do
Currently I'm studing Aerospace Engineering at TU Berlin. I'm also IT Administrator at Moccu – Creative Agency for Digital Media and Open-Source Developter with affinity to OpenBSD project.
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