3 ms·

Raster CRT Typography (According to DEC)

24 points by 6581 4y ago

ChuckNorris89 4y ago
Obligatory Technology Connections video explaining how CRT pixels aren't really pixels as we understand them. Definitely worth the watch. https://www.youtube.com/watch?v=Ea6tw-gulnQ https://www.youtube.com/watch?v=Ea6tw-gulnQ
blt 4y ago
I imagine there's some trim pots in there somewhere that can affect aspect ratio, too.
genpfault 4y ago
(2019) Priors: https://news.ycombinator.com/item?id=25523322 https://news.ycombinator.com/item?id=25523322 (18 comments) https://news.ycombinator.com/item?id=19528618 https://news.ycombinator.com/item?id=19528618 (54 comments) https://news.ycombinator.com/item?id=19207373 https://news.ycombinator.com/item?id=19207373 (0 comments)
masswerk 4y ago
Here's the "workbench implementation" mentioned at the end (too much blur/bleed), nothing came of tge project it was intended for: https://www.masswerk.at/rterm/VT/ https://www.masswerk.at/rterm/VT/ See also this "fancy" variant: https://www.masswerk.at/rterm/VT/fancy.html https://www.masswerk.at/rterm/VT/fancy.html
- hulitu 4y ago
  Some people just don't get the fact that CRT images were pretty sharp. LCDs were crap due to high persistence. Old games look horrible on LCD monitors.
  - masswerk 4y ago
    Yes, esp. monochrome CRTs can be actually too sharp. (E.g., I've a Sharp MZ-80, which I prefer to run with somewhat reduced focus.) Something I found out lately, on LCD, you really have to model pixel "softness" in the time domain. See for example here: https://masswerk.at/pet/?prg=back2pet&screen=green&persistence=long&rom=4&ram=32k&autorun=true&sound=true https://masswerk.at/pet/?prg=back2pet&screen=green&persisten... (This is a demo by shiru8bit, "Back to the PET", from last year, running in a "hot" demo mode with longer persistence, which is a bit reminiscent of a well known video showing this demo in a dark room with video and audio in overdrive. The problem with this is that persistence is still modelled linearly, instead of sinusoidally as it ought to be, for economic reasons, since it's running in a web browser.) There's a shortcut to this and other recent demos: https://masswerk.at/pet/?demos https://masswerk.at/pet/?demos

24 points by 6581 4y ago

Obligatory Technology Connections video explaining how CRT pixels aren't really pixels as we understand them. Definitely worth the watch. https://www.youtube.com/watch?v=Ea6tw-gulnQ https://www.youtube.com/watch?v=Ea6tw-gulnQ

blt 4y ago

I imagine there's some trim pots in there somewhere that can affect aspect ratio, too.

genpfault 4y ago

(2019) Priors: https://news.ycombinator.com/item?id=25523322 https://news.ycombinator.com/item?id=25523322 (18 comments) https://news.ycombinator.com/item?id=19528618 https://news.ycombinator.com/item?id=19528618 (54 comments) https://news.ycombinator.com/item?id=19207373 https://news.ycombinator.com/item?id=19207373 (0 comments)

masswerk 4y ago

Here's the "workbench implementation" mentioned at the end (too much blur/bleed), nothing came of tge project it was intended for: https://www.masswerk.at/rterm/VT/ https://www.masswerk.at/rterm/VT/ See also this "fancy" variant: https://www.masswerk.at/rterm/VT/fancy.html https://www.masswerk.at/rterm/VT/fancy.html

hulitu 4y ago
Some people just don't get the fact that CRT images were pretty sharp. LCDs were crap due to high persistence. Old games look horrible on LCD monitors.
- masswerk 4y ago
  Yes, esp. monochrome CRTs can be actually too sharp. (E.g., I've a Sharp MZ-80, which I prefer to run with somewhat reduced focus.) Something I found out lately, on LCD, you really have to model pixel "softness" in the time domain. See for example here: https://masswerk.at/pet/?prg=back2pet&screen=green&persistence=long&rom=4&ram=32k&autorun=true&sound=true https://masswerk.at/pet/?prg=back2pet&screen=green&persisten... (This is a demo by shiru8bit, "Back to the PET", from last year, running in a "hot" demo mode with longer persistence, which is a bit reminiscent of a well known video showing this demo in a dark room with video and audio in overdrive. The problem with this is that persistence is still modelled linearly, instead of sinusoidally as it ought to be, for economic reasons, since it's running in a web browser.) There's a shortcut to this and other recent demos: https://masswerk.at/pet/?demos https://masswerk.at/pet/?demos