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Questions tagged [ntsc]

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

32
votes
4answers
7k 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 select the palette used for the three-and-a-half pixels represented by the byte. Like this: 0: Black,...
15
votes
4answers
4k 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=...
12
votes
2answers
585 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 ...
12
votes
1answer
843 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 ...
10
votes
4answers
1k 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.
10
votes
1answer
320 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. ...
9
votes
4answers
1k 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 ...
8
votes
4answers
957 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 ...
8
votes
1answer
331 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 ...
8
votes
4answers
1k 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 ...
7
votes
3answers
277 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 ...
6
votes
2answers
302 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 ...
5
votes
2answers
340 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....
4
votes
4answers
239 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 ...
3
votes
1answer
246 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. ...
3
votes
1answer
157 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?