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Questions tagged [ntsc]

Questions related to the NTSC video standard (commonly used in North America and Japan).

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14 votes
4 answers
2k views

NTSC scan lines used by 8-bit computers

Several computers of the late 70s used a TV set for their display. I'm not talking about the TRS-80, which came with a monitor that was basically a stripped-down black and white TV set, but computers ...
rwallace's user avatar
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4 votes
3 answers
826 views

Sony PVM (PVM-14M1J, NTSC-J) Displaying the Wrong Colors

Edits I have accidentally used the word composite over component, but after testing it with an RGB cable and an S-video cable, the results are the same. I've been told to mention that my PVM is NTSC-...
Tai Alt's user avatar
  • 73
11 votes
1 answer
559 views

What were the Apple II artifact colors?

A simplified version of the question in the title is "is lo-res color #1 red, or is it purple?" because that's the color that shows the most obvious variation. Color #1 was usually called &...
benrg's user avatar
  • 2,422
3 votes
1 answer
271 views

Did using a PAL display mode for Amiga Workbench slow down an NTSC machine?

Inspired by this question about the CPU frequency when booting the Amiga in PAL vs NTSC, I'm curious if the CPU frequency was affected by using the other display mode. In other words, I used an ECS ...
bjb's user avatar
  • 16.4k
19 votes
3 answers
2k views

Why was the VIC-II restricted to a hard-coded palette?

The MOS VIC in the VIC-20 and the MOS VIC-II in the C64 were capable of outputting 16 colours drawn from a hard-coded palette. It's clear that the palette size was fixed at 16 colours as a memory-...
Psychonaut's user avatar
  • 7,611
13 votes
7 answers
5k views

Could some 200 line displays have been pushed to 240 lines?

Reviewing Raffzahn's answer about CGA emulators for Hercules displays, and especially his initial (now corrected) note about 720x350 being PAL's natural resolution, I was wondering if 200/400 line ...
airman's user avatar
  • 1,350
0 votes
4 answers
545 views

Why we YIQ is composite signal where RGB three different signal? [closed]

As we know that RGB monitors requires separates signals for red, green, and blue components of the image but television monitors uses single composite signals. For this composite signal use YIQ color ...
S. M.'s user avatar
  • 111
4 votes
2 answers
1k views

How could/can there exist NTSC->PAL converters for SNES and other classic game consoles?

Re-reading my old video game magazines from the mid-1990s, there's constant mentions of "USA import" games which were not released here and which "require an adapter". Many of the ...
Stace's user avatar
  • 41
5 votes
2 answers
518 views

Digital to analog in an old 35mm film recorder [closed]

I'm looking at an old film recorder from 1985, the Polaroid Freeze Frame, the back of the machine pictured here: From here: https://www.radiomuseum.org/r/polaroidco_freezeframe_video_recorder.html I ...
Curiousmarble's user avatar
30 votes
5 answers
7k views

Were the classic game consoles *technically* able to play both NTSC and PAL games, if ignoring artificial region lock-in?

I'm not asking if they were region-free; I know they weren't generally. I'm asking if, given an NTSC-supporting PAL TV, an NTSC game cartridge, and a PAL NES/SNES/N64/whatever, and also given some ...
D. S.'s user avatar
  • 301
11 votes
5 answers
3k views

Did the PAL version of Super Mario Bros. on the NES really have faster music, and if so, why?

I have a real PAL NES hooked up to a modern TV with an AV-to-HDMI adapter (yeah, I'm working on finding a CRT). I bought an EverDrive cartridge for it because I'm a poor person who cannot afford to ...
Lumen's user avatar
  • 111
13 votes
1 answer
4k views

Is the only reason that my PAL NES is able to run NTSC/American games that it's doing it on an EverDrive?

I have an original PAL NES console. To the best of my knowledge, it is entirely unmodified. I have an EverDrive N8 Pro inside on which I've put a bunch of European/PAL ROMs, but also a few NTSC/...
B. V.'s user avatar
  • 163
4 votes
1 answer
2k views

Was PAL or NTSC encoder IC a critical component in early video games?

I have an old Philips Videopac C52 video game console of the  Philips Odyssey 2 family like the G-7000 with 128-byte RAM: While checking its boards to compare with the schematics I got for the G-7000 ...
Paul Ghobril's user avatar
  • 1,035
2 votes
0 answers
987 views

Does RetroArch have a PAL filter like the NTSC one?

RetroArch the emulator "wrapper" has an option to enable an NTSC filter over the image, simulating the visual look of a composite NTSC signal/TV. Here is a comparison between the "raw&...
Cerjio's user avatar
  • 21
4 votes
1 answer
188 views

Will US Amiga 500 work in UK with UK power supply?

Apart from the input voltage there are video signals (PAL, NTSC). Will I be able to use A500 that came from USA by just swapping a power supply, or any of the chips need to be replaced as well?
Bartek Malysz's user avatar
12 votes
2 answers
1k views

Limitations for Color Usage in NTSC

In a well known letter to Philip Timmermann, Robert Yannes describes C64 color generation hardware as capable of producing any color (the palette was fixed, of course, but chosen semi-arbitrarily and ...
Anton's user avatar
  • 477
21 votes
3 answers
7k views

Did arcade monitors have same pixel aspect ratio as TV sets?

It is well known that when emulating classic games on modern displays, you need to be careful not to distort the aspect ratio. Generally speaking, CRT screens were 4:3, and specific pixel aspect ...
rwallace's user avatar
  • 61.5k
14 votes
5 answers
1k views

Turning off the color burst

On early color computers, it was possible to add a feature by which you could turn off the color burst output, restricting the display to black and white but making it significantly sharper and ...
rwallace's user avatar
  • 61.5k
4 votes
4 answers
384 views

Running European retrocomputers on 60Hz power?

I have 3 European retro computers that I'm trying to run on North American power through a step-up transformer. So, I am using 220V/60Hz instead of the European standard of 220V/50Hz. BBC Master ...
Brian H's user avatar
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3 votes
1 answer
336 views

PAL consoles to US HDTV

what would be the best way to display a PAL TV signal on a modern HDTV in the USA? Do HDMI upscalers do an acceptable job of getting PAL 50hz input out to a normal HDMI 1080p 60hz?
papashou's user avatar
  • 131
3 votes
2 answers
765 views

IBM 5153 monitor vertical resolution

The IBM 5153, the color monitor accompanying the original IBM PC, was designed to work with the CGA graphics card, vertical resolution 200 scan lines. This was quite unsurprising and straightforward. ...
rwallace's user avatar
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10 votes
4 answers
1k views

Is a normal B&W TV good enough for 80-column text?

S-100 bus machines normally had displays that had 64-chars-per-line. The VDM-1 used a 7x9 format, and I think most cards used that, so that would be 448 pixels. I understand that an NTSC television ...
Maury Markowitz's user avatar
40 votes
4 answers
9k views

What determines the color of every 8th pixel on the Apple II?

On the Apple II there's an interesting way to add a little color to the bitmap, since the high bit selects the palette used for the three-and-a-half pixels represented by the byte. Like this: 0: Black,...
Omar and Lorraine's user avatar
23 votes
4 answers
7k views

Why not one pixel per color clock?

Early home computers and game consoles output video to TV sets. The NTSC color clock frequency is 3.58 MHz. This informed the design of some video systems: http://pineight.com/mw/index.php?title=...
rwallace's user avatar
  • 61.5k
9 votes
2 answers
1k views

Spectrum clones 512x192 mode usable text resolution

The original ZX Spectrum has a resolution of 256x192, for 32x24 text. Some later clones add a 512x192 mode. The most obvious thing to do with that is try to display 64x24 text. According to https://en....
rwallace's user avatar
  • 61.5k
11 votes
4 answers
3k views

Actual resolution of composite video monitors

Many early computers used TV sets as monitors. With an NTSC TV set, you could really only count on about 200 scan lines of vertical resolution, and for horizontal resolution, maybe 192 color clocks at ...
rwallace's user avatar
  • 61.5k
14 votes
1 answer
2k views

Did the PAL version of the Apple II use a different clock frequency?

The Apple II used a 6502 CPU clocked at 1.023 MHz which was tightly tied to the NTSC frequency (1/14 of crystal, 3.5 color clocks per CPU cycle). It is well known that the Disk ][ was primarily ...
bjb's user avatar
  • 16.4k
6 votes
4 answers
666 views

Is it possible to have a NTSC picture 240 pixels tall, without any line being hiding by overscan?

On the NES, the system I'm most familiar with, the NTSC models produce 240 lines of video image, but the top and bottom 8 pixels are usually considered to be "hidden" due to overscan. (The actual ...
Bregalad's user avatar
  • 1,856
17 votes
3 answers
2k views

Ideal resolution for color computer on NTSC

Suppose you were, in the early eighties, designing a color computer to run on an NTSC TV with a free hand to choose the specifications within the limits of the technology of the time. What would be ...
rwallace's user avatar
  • 61.5k
10 votes
2 answers
2k views

NTSC scan lines and vertical resolution

From https://en.wikipedia.org/wiki/BBC_Micro "the height of the graphics display was reduced to 200 scan lines to suit NTSC TVs". But NTSC is supposed to have 241 visible scan lines per half frame. ...
rwallace's user avatar
  • 61.5k
9 votes
4 answers
3k views

PAL NES in USA, 50Hz vs 60Hz

I was wondering if there existed a way to fix the difference in the running speeds of a PAL NES to run on TV's in the United States? Be it some converter or messing with the NES itself.
Zachstein's user avatar
  • 193
11 votes
1 answer
825 views

Why would a PAL Amiga sometimes start up in NTSC display mode?

For an OCS Amiga (Workbench 1.2 or 1.3) I remember sometimes after a Guru Meditation/software failure reboot, Workbench would be restricted to NTSC size displays (200 non-interlaced vertical lines in ...
nsandersen's user avatar
  • 1,753
9 votes
5 answers
3k views

ZX Spectrum PAL Composite Video to North American Monitor

I have a Sinclair ZX Spectrum 48k. I have source a suitable power supply, and applied the Composite Video Mod to bypass the PAL analogue modulator. Unfortunately, I can get no useful output, having ...
scruss's user avatar
  • 21.7k