5 ms·

all CRTs televisions were either 60Hz or 50Hz depending on where you are in the world

by sprayk 9mo ago

cm2187 9mo ago
Yes and no. Half of the screen was refreshing at a time, so it was really flashing at 30Hz. You still had a visible stroboscopic effect. True 60Hz and 100Hz screen appeared in the late 90s and made a visible difference in term of comfort of viewing.
- mabster 9mo ago
  I'm guessing you're talking about interlacing? I've never really experienced it because I've always watched PAL which doesn't have that. But I would have thought it would be perceived as flashing at 60 Hz with a darker image?
  - pledg 9mo ago
    PAL had interlacing
    - walkerbrown 9mo ago
      For anyone this deep on the thread, check out this video (great presenter!) explaining TV spectrum allocation, NTSC, PAL, and the origin of 29.97 fps. https://youtu.be/3GJUM6pCpew https://youtu.be/3GJUM6pCpew
      - DonHopkins 9mo ago
        TIL NTSC: He explained that NTSC stands for Not The Smartest Choice, but I always assumed it meant Never The Same Color.
    - mabster 9mo ago
      Memories shattered. Yeah, you're right and I would have watched interlaced broadcast content. I saw interlaced NTSC video in the digital days where the combing was much more obvious and always assumed it was only an NTSC thing!
- SoftTalker 9mo ago
  Yeah I remember I could not use a CRT computer monitor at 60Hz or less for any length of time, as the strobing gave me a headache.
- ntoskrnl_exe 9mo ago
  I think you're mixing monitors and TVs together. CRT TVs only supported vertical refresh rates of 50Hz or 60Hz, which matched the regional mains frequency. They used interlacing and technically only showed half the frame at a time, but thanks to phosphor decay this added a feeling of fluidity to the image. If you were able to see it strobe, you must have had an impressive sight. And even if they supported higher refresh rates, it wouldn't matter, as the source of the signal would only ever be 50/60Hz. CRT monitors used in PCs, on the other hand, supported a variety of refresh rates. Only monitors for specific applications used interlacing, customer grade ones didn't, which means you could see a strobing effect here if you ran it at a low frequency. But even the most analog monitors from the 80s supported atleast 640x480 at 60Hz, some programs such as the original DOOM were even able to squeeze 70Hz out of them by running at a different resolution while matching the horizontal refresh rate.
  - myself248 9mo ago
    For some reason I remember 83Hz being the highest refresh rate supported by my XGA CRT, but I think it was only running at SVGA (800x600) in order to pull that rate. Some demos could throw pixels into VRAM that fast, and it was wild looking. Like the 60Hz soap-opera effect but even more so. I still feel that way looking at >30fps content since I really don't consume much of it.
  - pezezin 9mo ago
    > some programs such as the original DOOM were even able to squeeze 70Hz out of them by running at a different resolution while matching the horizontal refresh rate. 400p at 70 Hz was the default resolution of the VGA, pretty much all the classic mode 13h games ran at 70 Hz.

all CRTs televisions were either 60Hz or 50Hz depending on where you are in the world

by sprayk 9mo ago

all CRTs televisions were either 60Hz or 50Hz depending on where you are in the world

Yes and no. Half of the screen was refreshing at a time, so it was really flashing at 30Hz. You still had a visible stroboscopic effect. True 60Hz and 100Hz screen appeared in the late 90s and made a visible difference in term of comfort of viewing.

mabster 9mo ago
I'm guessing you're talking about interlacing? I've never really experienced it because I've always watched PAL which doesn't have that. But I would have thought it would be perceived as flashing at 60 Hz with a darker image?
- pledg 9mo ago
  PAL had interlacing
  - walkerbrown 9mo ago
    For anyone this deep on the thread, check out this video (great presenter!) explaining TV spectrum allocation, NTSC, PAL, and the origin of 29.97 fps. https://youtu.be/3GJUM6pCpew https://youtu.be/3GJUM6pCpew
    - DonHopkins 9mo ago
      TIL NTSC: He explained that NTSC stands for Not The Smartest Choice, but I always assumed it meant Never The Same Color.
  - mabster 9mo ago
    Memories shattered. Yeah, you're right and I would have watched interlaced broadcast content. I saw interlaced NTSC video in the digital days where the combing was much more obvious and always assumed it was only an NTSC thing!
SoftTalker 9mo ago
Yeah I remember I could not use a CRT computer monitor at 60Hz or less for any length of time, as the strobing gave me a headache.
ntoskrnl_exe 9mo ago
I think you're mixing monitors and TVs together. CRT TVs only supported vertical refresh rates of 50Hz or 60Hz, which matched the regional mains frequency. They used interlacing and technically only showed half the frame at a time, but thanks to phosphor decay this added a feeling of fluidity to the image. If you were able to see it strobe, you must have had an impressive sight. And even if they supported higher refresh rates, it wouldn't matter, as the source of the signal would only ever be 50/60Hz. CRT monitors used in PCs, on the other hand, supported a variety of refresh rates. Only monitors for specific applications used interlacing, customer grade ones didn't, which means you could see a strobing effect here if you ran it at a low frequency. But even the most analog monitors from the 80s supported atleast 640x480 at 60Hz, some programs such as the original DOOM were even able to squeeze 70Hz out of them by running at a different resolution while matching the horizontal refresh rate.
- myself248 9mo ago
  For some reason I remember 83Hz being the highest refresh rate supported by my XGA CRT, but I think it was only running at SVGA (800x600) in order to pull that rate. Some demos could throw pixels into VRAM that fast, and it was wild looking. Like the 60Hz soap-opera effect but even more so. I still feel that way looking at >30fps content since I really don't consume much of it.
- pezezin 9mo ago
  > some programs such as the original DOOM were even able to squeeze 70Hz out of them by running at a different resolution while matching the horizontal refresh rate. 400p at 70 Hz was the default resolution of the VGA, pretty much all the classic mode 13h games ran at 70 Hz.