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by rricharz
Mon Jan 06, 2020 8:55 am
Forum: Raspberry Pi OS
Topic: Changing system foreground and background colors
Replies: 2
Views: 236

Re: Changing system foreground and background colors

OK, changing themes is the key word. I changed it to „ThinIce“ and it is better.
by rricharz
Mon Jan 06, 2020 7:51 am
Forum: Raspberry Pi OS
Topic: Changing system foreground and background colors
Replies: 2
Views: 236

Changing system foreground and background colors

Sorry, I'm using Raspbian since many years, but now that my eyes get older, I just cannot work anymore with the standard system text and background colors. If I open the file manager, the background is much too bright, and the text not dark enough. Just lowering the brightness on the screen does not...
by rricharz
Thu Dec 19, 2019 4:30 am
Forum: C/C++
Topic: Audio playback in C
Replies: 8
Views: 677

Re: Audio playback in C

I found in the mean time that using "mpg321" does the job very easily. Running it from within my C program works without any noticeable lag on my Raspberry Pi 4 with attached HDMI screen. It can be installed with sudo apt-get mpg321 I just put the following code in my program to play the switch soun...
by rricharz
Mon Dec 16, 2019 10:01 am
Forum: C/C++
Topic: Audio playback in C
Replies: 8
Views: 677

Re: Audio playback in C

PS: You r TU-56 graphics are excellent... I want to do something similar with the 803's 35mm Magnetic Film handlers. https://en.wikipedia.org/wiki/Elliott_8 ... t_803B.jpg Magnetic tape drives are extremely interesting examples of electrical and mechanical engineering in the last century. A vacuum ...
by rricharz
Mon Dec 16, 2019 9:42 am
Forum: C/C++
Topic: Audio playback in C
Replies: 8
Views: 677

Re: Audio playback in C

Peter, Very nice indeed! That's exactly what I'm looking for. You even have sound for the switches. One important point. When the reels are starting to turn, I do not yet know for how long they will turn. I therefore need a way to pause the sound (or play back the sound of the drive while it is not ...
by rricharz
Mon Dec 16, 2019 9:13 am
Forum: C/C++
Topic: Audio playback in C
Replies: 8
Views: 677

Audio playback in C

I'm currently working on an on-screen front panel emulator for the vintage 1970s DECtape TU56 magnetic tape drive. This video shows is running on a PiDP-11 (a replica of a PDP-11) with the emulator running on a Raspberry Pi 4: https://youtu.be/Ye_s0w6C970 A video of the original vintage hardware in ...
by rricharz
Wed Dec 04, 2019 7:13 am
Forum: Raspberry Pi OS
Topic: Hide mouse cursor in full screen mode
Replies: 0
Views: 302

Hide mouse cursor in full screen mode

What is the best way using Raspbian Buster to hide the mouse cursor in full screen mode for a particular application? I have read about unclutter. Is this the right way to do it? Or is there anything which can be set in a configuration file? I'm using cool-retro-term on my PDP-11 replica based on a ...
by rricharz
Fri Aug 09, 2019 7:01 am
Forum: Graphics, sound and multimedia
Topic: Historical high resolution graphics on the Raspberry Pi
Replies: 36
Views: 8641

Re: Historical high resolution graphics on the Raspberry Pi

I have added some plot files of the spacelab made with the tek4010 emulator and the ICEMDDN CAD package made on a CDC Cyber 175 mainframe emulator in my github repo. Thanks to Nick Glazzard for the plot files. These could definitely benefit from a screen with 4K resolution. https://raw.githubusercon...
by rricharz
Thu Jul 25, 2019 10:37 am
Forum: Graphics, sound and multimedia
Topic: Historical high resolution graphics on the Raspberry Pi
Replies: 36
Views: 8641

Re: Historical high resolution graphics on the Raspberry Pi

It's a nice start. But I'm sure that the vectors can be accelerated using hardware video acceleration, and multiple can be ran at a time. Yes, indeed, but the purpose of the project was to recreate the original as nearly as possible. The Raspberry Pi is more than fast enough for what you are talkin...
by rricharz
Thu Jul 25, 2019 8:33 am
Forum: Graphics, sound and multimedia
Topic: Historical high resolution graphics on the Raspberry Pi
Replies: 36
Views: 8641

Re: Historical high resolution graphics on the Raspberry Pi

One has to differentiate between vector displays using bistable storage such as the Tektronix 4014 and other types of vector displays. On a bistable storage tube, you could draw using a very focussed beam and high resolution deflection circuits, but drawing had to be rather slow. Because the image w...
by rricharz
Thu Jul 25, 2019 7:46 am
Forum: Graphics, sound and multimedia
Topic: Historical high resolution graphics on the Raspberry Pi
Replies: 36
Views: 8641

Re: Historical high resolution graphics on the Raspberry Pi

4 GByte of course, sorry. I'm blaming it to the hot weather today in Europe (already 30 deg C in my office at 9 AM).
by rricharz
Thu Jul 25, 2019 7:23 am
Forum: Graphics, sound and multimedia
Topic: Historical high resolution graphics on the Raspberry Pi
Replies: 36
Views: 8641

Re: Historical high resolution graphics on the Raspberry Pi

I have tested the tek4010 emulator with the laters 4 GByte RPi4 (corrected), and it works very nicely with the additional memory, processing power and graphics speed. My terminal has a resolution of 1920 x 1080. Using a 4K terminal will be even better to emulate the original Tektronix 4014 with the ...
by rricharz
Wed Jul 24, 2019 3:56 pm
Forum: Advanced users
Topic: pin 40 on rpi 4
Replies: 5
Views: 1060

Re: pin 40 on rpi 4

I have decided to use some external pullup registers until wiringPi is fixed. This works properly.
by rricharz
Wed Jul 24, 2019 9:23 am
Forum: Advanced users
Topic: pin 40 on rpi 4
Replies: 5
Views: 1060

Re: pin 40 on rpi 4

Thanks, Joan. Your input is helpful because it shows that pin 40 can be set to pullup. I have quite a number of large programs which benefit a lot from the new Pi4 speed and memory, but use lots of pins using C and WiringPi. Some pins are attached to buttons and do therefore need a pullup. I do not ...
by rricharz
Wed Jul 24, 2019 8:02 am
Forum: Advanced users
Topic: pin 40 on rpi 4
Replies: 5
Views: 1060

pin 40 on rpi 4

Hi, I am trying to use pin 40 (BCM 21, wiringPi 29) as an input pin on my new Raspberry Pi 4. I have upgraded wiringPi to the latest version 2.52. Most pins appear to work as before, but pin 40 cannot be set to an input pin with pullup anymore: Trying to use gpio mode 29 in gpio mode 29 up Does not ...
by rricharz
Wed May 29, 2019 5:00 am
Forum: Graphics, sound and multimedia
Topic: Historical high resolution graphics on the Raspberry Pi
Replies: 36
Views: 8641

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: 36
Views: 8641

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: 36
Views: 8641

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: 3651

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: Raspberry Pi OS
Topic: mounted usb drive does not show up in /media/pi
Replies: 1
Views: 547

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: Raspberry Pi OS
Topic: mounted usb drive does not show up in /media/pi
Replies: 1
Views: 547

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: Raspberry Pi OS
Topic: Updating: scrollpathd error
Replies: 3
Views: 630

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: 1067

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: 5356

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: 5356

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...

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