> scrolling-h ]
scrolling-h - display scrolling Hs
Display scrolling Hs on the screen as specified in CISPR 22 and similar EMC standards.
which will run on many of the web browsers independent to the operating systems.
This code is in the public domain.
For the colorbar test pattern specified in CISPR 32, see
ITU-R BT.1729 Colour bar with Moving Element.
How to run it
Simply load scrolling-h.html
If it is necessary, you can probably make the browser window full screen.
If you want to run it offline,
you can save the file scrolling-h.html
on your local storage.
- b: black letters on white screen
- w: white letters on black screen
- 0-9: set font size (smaller to larger)
- f: make scroll faster
- n: default scroll speed
- s: make scroll slower
- p: pause scroll
- Version 0.1 (2013-02-09)
- First relase with no key operations at all
- Version 0.2 (2013-02-16)
- Enable some key operations to change font size, colors, etc.
- Version 0.3 (2015-11-15)
- To make it easier to count number of letters in a line,
a bold face letter is printed for every ten letters
and an underlined letter is printed for every fifty letters in the first line.
- New key assign: p key to pause scroll
- Version 0.4 (2016-02-20)
- No longer use bold face letters.
Ruler to help count characters are now displayed at the first line.
Another Implementation of Scrolling Hs
Bourne shell (sh)
If you are a UN*Xer, maybe you can simply run:
while true; do echo -n H; usleep 1000; done
on your Bournish shells.