RCA ? TV: text-output.

On the Raspberry Pi using Raspbian OS, there is always the option of using sudo raspi-config and choosing the "Internationalisation" menu entry and setting the keyboard type from there (It defaults to UK)

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Dom
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From which we deduce that Unknown Dog is probably not using a UK keyboard.

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martin@   | Martin Gregorie 
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Martin Gregorie

--[snip]--

Sure, apparently there were no video-inputting-devices like DVDs in ZX80-days.

As pointed out here [which I'd forgotten about] the RGB-triple-beam and phosphor-matrix-complexity must drastically reduce the resolution. So I suspect that B/W TVs could give an acceptable resolution. But I've lost contact with the market, and just remember that obviously B/W was much cheaper than colour, when colour came out. Probably B/W doesn't even exist today, even in the 3rd world?

Reply to
Unknown

Depending on where you are, it may not be that bad. Shortly before the US went digital, I was still seeing little portable B&W TVs (about 6" or so) in the sort of convenience stores that sell to truckers. They were cheap enough to be interesting (saw one for $9, IIRC), but didn't have a composite video input.

Of course, now that we're all digital, there's no point in that sort of thing anymore.

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roger ivie 
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Roger Ivie

sadly, but nowadays even the weather is digital. In the old analog days we had spring, summer, autum and winter now, we have high (warm/summer) and low (cold/winter)...

Regards and have a nice day Julius

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Reply to
Julius Kavay

It reduces the acuity horizontally, but has less effect vertically.

Typically on a colour TV driven from an RF input, a text size of 60x25 is about the largest you will get that's readily readable.

Yup, 80x25 on a composite B&W (or green / amber etc) monitor is quite pleasant. A TV would probably be a little more fuzzy.

Ebay has plenty...

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John. 
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Reply to
John Rumm

Actually, the luminance bandwidth limitations (due to chroma subcarrier separation) is almost always the limiting factor. Most color CRTs have enough resolution to support acceptable 80-column text, but the limited luminance bandwidth is insufficient for easily legible characters.

Apple made a line of color composite (NTSC) monitors for the Apple II line that, perhaps uniquely, switched off luminance filtering for monochrome signals. This allowed a much greater luminance bandwidth and relatively crisp 80-column text (560 horizontal pixels).

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-michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon
Reply to
Michael J. Mahon

The ZX Spectrum (16K and 48K) put out a UHF signal from an internal modulator (ASTEC 1233 ?) and in addition, the edge connector carried the composite signal that fed the internal modulator, along with separate colour difference signals on other "pins."

SteveW

Reply to
SteveW

On 25/11/2013 15:32, John Rumm wrote: > Typically on a colour TV driven from an RF input, a text size of > 60x25 is about the largest you will get that's readily readable.

The BBC Micro could do 80x32 on good quality PAL TV, perfectly readable.

---druck

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druck

That probably was on a SCART-RGB connection?

Reply to
Rob

The BBC 80x32 was at best only adequate on the official Microvitec Cub RGB monitor IME... It was much better on the longer persistence mono monitors that used to mask much of the beebs characteristic pixel jitter. Going through the RF stages on most TVs of the era did not help.

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John. 
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Reply to
John Rumm

It was a lot better with RGB, but it also worked via UHF although not as sharp or as stable.

With UHF you could simulate grey by alternating green and purple pixels, where as on RGB you could see individual pixels.

---druck

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druck

I bought such a beast, battery powered, to help with satellite dish alignment (thought I'd take it and a satellite receiver up on the roof to make sure that I was adjusting for peak signal on the correct satellite, now that there are so many) but never had to use it for that.

It had a composite input and that did allow me to boot a Pi before I had an HDMI to VGA converter or HDMI-capable TV, but the text was nearly unreadable. Proved that the Pi was functional though. Once you can read the text, you can of course change to a large font! Maybe that should be the default.

I think it's about a 4" screen - thing in the shape of a football, bought cheaply when they began to turn off analogue TV.

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Windmill, TiltNot@NoneHome.com       Use  t m i l l 
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Windmill

Some domestic colour TVs switched out the chroma trap in the luminence path when the colour killer was active. In the early days of colour in the UK it was usual for the broadcaster to turn off the subcarrier burst during monochrome programmes.

They used to turn off the pilot tone off on FM radio too.

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Graham. 

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Reply to
Graham.

That's what the Apple composite color monitors did, making 80-column text (in a 40 microsecond window) quite readable.

In the US, this was almost unheard of in a color receiver.

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-michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon
Reply to
Michael J. Mahon

Been there done that, long ago.

That doesn't fix mine; nor after a re `init 2` nor reboot.

'fonts' are in the same bag as keybrds, so try this quirk: `wily` is a killer-ap IMO: versatile like emacs, but mouse-based: so that you can fly-heads-up. It can toggle fonts between fixed & proportional. The problem is that, when scrolling, it often 'tears': showing only part of the chars in some lines. Toggling the font fixes the problem and shows the full text, until the next scroll.

This problem manifests in RPi and eg. Slakware X86, ..etc., but NOT in my old 1990's RedHat6.2.

How do fonts work? It seems that if it can't find the recommened one, it takes a guess.

==TIA.

PS. when I got the 1st rPi, I didn't want to setup the keybrd, without first confirming that it worked. So I left the setup-routine on VT1 and used VT2. And of course I lost the setup-routine. `raspi-config` seems to be the FIRST-TIME startup menu. Is it?

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Unknown

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