Raster CRT Typography According to DEC
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Raster CRT Typography According to DEC
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Re: Raster CRT Typography According to DEC
#2Similar project is cool-retro-term [1] although I think the defaults are a little over the top.
Re: Raster CRT Typography According to DEC
#3Fantastic. My favourite terminal I worked on was the amber-colored vt320 hooked to a sun box and sometimes to an sgi. There was something special to it, even 'back in the day'.
Re: Raster CRT Typography According to DEC
#4There's a really interesting video about character generation on HP 264x series terminals: https://www.youtube.com/watch?v=QikO0WOAGWI
Re: Raster CRT Typography According to DEC
#5Interesting post. From my work on 1980s micros that used CRT TVs for display, the phosphor response described here seems to be a bit oversimplified.
In my purely subjective experience, rise time seems to be shorter than fall time - pixels will usually be visibly blurred on the trailing (right) edge, but sharper on the leading (left) edge. Another thing I noticed is that a longer horizontal row of pixels will leave a longer decay on the trailing edge than a single pixel. For example, the Ts will usually have their horizontal line visibly stretched on the trailing edge, even when the vertical line seemed sharp.
Of course, purpose-built terminals might have used different phosphors than cheap TVs of the time. It might also have to do with video amp bandwidth, or something else electrical.
Re: Raster CRT Typography According to DEC
#6Interesting post. From my work on 1980s micros that used CRT TVs for display, the phosphor response described here seems to be a bit oversimplified. In my purely subjective experience, rise time seems to be shorter than fall time - pixels will usually be visibly blurred on the trailing (right) edge, but sharper on the leading (left) edge. Another thing I noticed is that a longer horizontal row of pixels will leave a…
Without disagreeing with you, the diagrams from the linked page are pretty much reproductions of the ones from an official VT100 technical manual, https://vt100.net/docs/vt100-tm/
It appears to me that the rise/fall graphs are just graphs of ideal RC networks, while the whole true CRT system will have lots of other factors such as inductance going on.
When it comes to comparing what you might recall of CRT TVs and 80s micros to what a dedicated monochrome CRT would show, well, the dedicated CRT was much better and sharper, particularly if your color display technology involved a "composite" system like NTSC or PAL, where horizontal luminance (Y) bandwidth was SEVERELY limited to "make room for" the color information (I/Q).
To get an idea of how much Composite video encoding degraded picture information, take a look at modern videos of "RGB-modded" classic consoles such as https://www.youtube.com/watch?v=kpdpAxzjmA8 -- As far as I understand from the video explanation, both signals are video-captured, so this is not a "CRT effect", it's a "composite video effect" that makes the right-side image so smeared. There's also the palette difference, but that's more a matter of preference.
Re: Raster CRT Typography According to DEC
#7There's a really interesting video about character generation on HP 264x series terminals: https://www.youtube.com/watch?v=QikO0WOAGWI
That's nothing! Tektronix did vector fonts in the 60s using analogue ROMs.
Re: Raster CRT Typography According to DEC
#8There's a really interesting video about character generation on HP 264x series terminals: https://www.youtube.com/watch?v=QikO0WOAGWI
That's nothing! Tektronix did vector fonts in the 60s using analogue ROMs.
That's nothing, the Jaquet-Droz family were producing glyphs from mechanical analogue storage in ~1770. https://www.youtube.com/watch?v=bY_wfKVjuJM
Re: Raster CRT Typography According to DEC
#9We need the VT52 experience: relay clicks as you type.
Re: Raster CRT Typography According to DEC
#10Is the HTML5 "workbench" VT100/220 emulation available to try?
(Didn't see a link to it)