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by rricharz
Wed May 29, 2019 5:00 am
Forum: Graphics, sound and multimedia
Topic: Historical high resolution graphics on the Raspberry Pi
Replies: 7
Views: 1205

Re: Historical high resolution graphics on the Raspberry Pi

Yes, you can display all the historic data just using a Raspberry Pi. They are all in the repo. Just downloading and installing tek4010 is sufficient.Then use the "cat" option to display the historical files. Of course it's nice to combine tek4010 with the PiDP-11 (also Raspberry Pi based) because o...
by rricharz
Tue May 28, 2019 7:10 pm
Forum: Graphics, sound and multimedia
Topic: Historical high resolution graphics on the Raspberry Pi
Replies: 7
Views: 1205

Re: Historical high resolution graphics on the Raspberry Pi

On the Tektronix terminal the bright drawing spot was very well visible. For a detailed explanation of the technology see
https://en.wikipedia.org/wiki/Direct-vi ... orage_tube
by rricharz
Tue May 28, 2019 7:06 am
Forum: Graphics, sound and multimedia
Topic: Historical high resolution graphics on the Raspberry Pi
Replies: 7
Views: 1205

Historical high resolution graphics on the Raspberry Pi

For those of you interested in the history of computer graphics, I have written a Tektronix 4010, 4013, 4014, 4015 and ARDS terminal emulator for the Raspberry Pi. It comes together with interesting historical graphics data. Youtube videos: https://youtu.be/4jZzypvxoHU https://youtu.be/7FMewaoEOmk G...
by rricharz
Sat Feb 16, 2019 8:41 pm
Forum: Advanced users
Topic: Cool-retro-term
Replies: 5
Views: 2252

Re: Cool-retro-term

Cool-retro-term works now well on Raspbian. See my installation instructions at https://github.com/rricharz/pidp11-2.11 ... r/Cool.pdf
by rricharz
Fri Feb 01, 2019 7:35 pm
Forum: Raspbian
Topic: mounted usb drive does not show up in /media/pi
Replies: 1
Views: 196

Re: mounted usb drive does not show up in /media/pi

I traced the problem down to usbmount being configured when installing Retropie on top of existing full Raspbian. Just disabling usbromservice in retropie config does not solve the problem. "sudo apt-get remove usbmount" does solve the problem and usb drives are again mounted as normal at boot and w...
by rricharz
Fri Feb 01, 2019 3:31 pm
Forum: Raspbian
Topic: mounted usb drive does not show up in /media/pi
Replies: 1
Views: 196

mounted usb drive does not show up in /media/pi

I have a strange problem with mounting usb drives: The drives mount automatically and can be accessed in /media/usb0, but their name does not show up in /media/pi If I have "Show mounted disks" selected in the desktop preferences, the usb drives show up on the desktop with their proper name, but whe...
by rricharz
Tue Jan 16, 2018 4:52 pm
Forum: Raspbian
Topic: Updating: scrollpathd error
Replies: 3
Views: 462

Updating: scrollpathd error

I am getting the following error when trying to update since today: Preparing to unpack .../python3-scrollphathd_1.1.0_all.deb ... Unpacking python3-scrollphathd (1.1.0) over (1.0.1) ... dpkg: error processing archive /var/cache/apt/archives/python3-scrollphathd_1.1.0_all.deb (--unpack): trying to o...
by rricharz
Wed Nov 15, 2017 9:28 am
Forum: Python
Topic: Use desktop font in Python(tkinter) [solved]
Replies: 1
Views: 753

Re: Use desktop font in Python(tkinter)

I have implemented the following solution: from os import system import os from tkinter import * from pathlib import Path from os.path import expanduser import configparser ... # get desktop font try: config = configparser.ConfigParser() configpath = expanduser("~") + "/.config/lxsession/LXDE-pi/des...
by rricharz
Sat Nov 11, 2017 7:22 am
Forum: Troubleshooting
Topic: “apt-get update” fails
Replies: 10
Views: 3864

Re: “apt-get update” fails

Does anybody know how to give a polite wakeup call to the foundation? I guess I am not the only one needing urgently an update.
by rricharz
Sat Nov 11, 2017 7:07 am
Forum: Troubleshooting
Topic: “apt-get update” fails
Replies: 10
Views: 3864

Re: “apt-get update” fails

Fails on my system too since yesterday afternoon, but with different message. Proposed workaround does not help. This happens even with a fresh image! I tried many times yesterday evening and this morning and always get the same error. pi@pitop:~ $ sudo apt update Hit:1 http://archive.raspberrypi.or...
by rricharz
Thu Nov 09, 2017 7:59 pm
Forum: Scratch
Topic: create a block to execute a python script
Replies: 2
Views: 1956

Re: create a block to execute a python script

Thanks, Gerhard,

I will try to use what you suggested.

Rene
by rricharz
Wed Nov 08, 2017 10:31 am
Forum: Scratch
Topic: create a block to execute a python script
Replies: 2
Views: 1956

create a block to execute a python script

Has anybody written an extention to create a block which calls the command line (for example a python or shell script), preferrably with arguments? I would like to send commands to some hardware (output only), which cannot be done by just changing a gpio pin, but can be easily done from within a pyt...
by rricharz
Fri Nov 03, 2017 3:36 pm
Forum: Python
Topic: Use desktop font in Python(tkinter) [solved]
Replies: 1
Views: 753

Use desktop font in Python(tkinter) [solved]

I am writing a gui interface in python using tkinter. I know how to set the font name and size in tkinter, but I would like to use the same font and size as the user has set on the desktop.

How can I read the desktop font name and size using python?
by rricharz
Sun Oct 15, 2017 9:17 am
Forum: Deutsch
Topic: Pi-Top Notebook
Replies: 7
Views: 1816

Re: Pi-Top Notebook

@crumble: Das der Pi nicht vom Strom getrennt wird, wenn man ihn herunter fährt, ist normal. Der Pi-top hat ein Power Management Module. Das ist auch notwendig, da er mit Batterie betrieben werden kann. In pi-topOS sind die notwendigen Treiber eingebaut. Falls man das normale Raspbian verwenden will...
by rricharz
Fri Oct 06, 2017 5:49 pm
Forum: Raspbian
Topic: Remote desktop (xrdp) on stretch: Some menu items do not work
Replies: 52
Views: 25938

Re: Remote desktop (xrdp) on stretch: Some menu items do not work

That's a very good description of what I am struggling with. I hope somebody can find a solution.
by rricharz
Mon Sep 25, 2017 10:05 am
Forum: Raspbian
Topic: Remote desktop (xrdp) on stretch: Some menu items do not work
Replies: 52
Views: 25938

Re: Remote desktop (xrdp) on stretch: Some menu items do not work

Thanks for your valuable input. For me xrdp has actually worked well in Jessie. I have a setup with 7 different Raspberry PI systems, with various screens (some very small, some headless). I have used xrdp to maintain all these systems, for example to clone sd cards using the desktop sd card copier....
by rricharz
Sun Sep 24, 2017 5:33 am
Forum: Raspbian
Topic: Remote desktop (xrdp) on stretch: Some menu items do not work
Replies: 52
Views: 25938

Remote desktop (xrdp) on stretch: Some menu items do not work

Remote desktop on Raspbian Stretch works quite well after installing it with sudo apt-get purge realvnc-vnc-server sudo apt-get install xrdp Unfortunately, some menu items do not work, such as Shutdown->Shutdown Preferences->Raspberry Pi Configuration Nothing happens if these menu items are executed...
by rricharz
Thu Aug 03, 2017 7:42 am
Forum: Raspbian
Topic: files list file for package qdbus is missing final newline
Replies: 2
Views: 2503

Re: files list file for package qdbus is missing final newline

Thanks, this fixed the problem.
by rricharz
Thu Aug 03, 2017 7:05 am
Forum: Raspbian
Topic: files list file for package qdbus is missing final newline
Replies: 2
Views: 2503

files list file for package qdbus is missing final newline

I downloaded a fresh copy of Raspbian today. Everything works fine, except if I try to do a sudo apt-get upgrade.

I get the following error:
dpkg: unrecoverable fatal error, aborting:
files list file for package qdbus is missing final newline

Is the newest Raspbian Image broken?
by rricharz
Thu Apr 06, 2017 2:38 pm
Forum: Gaming
Topic: PiGRRL 2 touch screen calibration - SOLVED
Replies: 2
Views: 1918

Re: PiGRRL 2 touch screen calibration - HELP NEEDED

I finally traced the problem down to the use of libinput instead of evdev in the newest version of Raspbian ( 4.4.50-v7+ #970 SMP Mon Feb 20). The following fix switches back to evdev: cd /usr/share/X11/xorg.conf.d sudo mv 10-evdev.conf 45-evdev.conf now you can run xinput_calibrator and put the res...
by rricharz
Wed Apr 05, 2017 6:46 am
Forum: Gaming
Topic: PiGRRL 2 touch screen calibration - SOLVED
Replies: 2
Views: 1918

Re: PiGRRL 2 touch screen calibration

Some further information: Calibrating the touch screen using the command line interface works well. The problem is just calibrating the x-input for the Raspbian gui. xinput-calibrator shows the following: Calibrating standard Xorg driver "stmpe-ts" current calibration values: min_x=0, max_x=65535 an...
by rricharz
Tue Apr 04, 2017 5:45 pm
Forum: Gaming
Topic: PiGRRL 2 touch screen calibration - SOLVED
Replies: 2
Views: 1918

PiGRRL 2 touch screen calibration - SOLVED

I want to use the desktop on my PiGRRL to run some games using gtk3 in addition to Retropie. The PiGRRL 2 has a 2.8 screen with resistive touch. I have therefore started my setup with the latest full Raspbian Jessie, added Retropie and then installed everything as described in the Adafruit tutorial ...
by rricharz
Sun Mar 26, 2017 6:24 am
Forum: Troubleshooting
Topic: USB Gadget Unable to Connect to Shared Internet
Replies: 2
Views: 833

Re: USB Gadget Unable to Connect to Shared Internet

I had the same problem using a Macbook Pro. After a while the internet access from the pi zero did not work anymore. I could still connect to the pi-zero using ssh, but did not have access to the internet from there. I used the following link for the setup of the internet gadget: https://learn.adafr...
by rricharz
Fri Mar 24, 2017 11:00 am
Forum: General programming discussion
Topic: Check whether sudo will work in bash script
Replies: 6
Views: 1355

Re: Check whether sudo will work in bash script

Thanks for your valuable input. I am a little bit worried about parsing the output of a program. What about foreign languages, other releases or if the wording is changed? For now, I have therefore decided to proceed as follows: - take all sudo statements out of my_script - request that the user run...
by rricharz
Fri Mar 24, 2017 9:11 am
Forum: General programming discussion
Topic: Check whether sudo will work in bash script
Replies: 6
Views: 1355

Check whether sudo will work in bash script

I have written a bash script to install my software. It uses sudo several times. Now I want to check at the beginning, whether the script is run by a user who has the right to use the sudo command, such as the user pi in Raspbian. I have searched the web, but have not found a simple and clean soluti...

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