Questions tagged [crt-monitor]

Cathode Ray Tube monitors: principles of operation and use with computing devices. DO NOT REPAIR CRTs; SEE TAG WIKI FOR DETAILS.

Filter by
Sorted by
Tagged with
5 votes
2 answers
394 views

Primary manufacturers of picture tubes for early monitors

Which companies were the most important manufacturers of picture tubes for monitors (both monochrome and color) in the seventies and eighties? That is, it's easy enough to find lists of monitors by ...
12 votes
2 answers
1k views

Did all integrated Commodore PET monitors always use 60 Hz refresh?

All models of the Commodore PET line had built-in monitors, and at least the U.S. models had 60 Hz refresh. For the European models there was no need for compatibility with European television ...
0 votes
1 answer
194 views

Apple II color monitor displays everything in green

I have an AppleColor composite monitor (A2M6020) that only shows green-scale. The color toggle switch on the front doesn’t change anything. I have plugged the monitor into multiple devices with the ...
0 votes
1 answer
146 views

Monitor connector for C64 and ST the same?

I have a monitor (colour) that works on my Atari ST. The connector looks similar to that of my Commodore 64, but it doesn’t seem to fit. Now I don’t know if I just have to use a bit more force, or ...
17 votes
5 answers
5k views

Why didn't early color TV sets accept RGB input?

Early PCs generated RF signal, and later Composite video or S-video, to use a TV set as monitor. Why didn't color TVs of those days expose a analog RGB interface for direct connection from VCR/PC or ...
4 votes
0 answers
351 views

How does the Apple IIgs color compare to the Apple Macintosh color?

There has been an interesting discussion of how to convert Classic Macintosh Color to sRGB, which begs a second question. How does color on the IIgs compare to that of Classic Macintosh? I'm asking ...
4 votes
1 answer
521 views

How to use thinkpad x230 with PCjr 4863 monitor?

I understand it is probably more trouble than it is worth, but I am keen on using my 4863 IBM monitor as a second display for my x230. So far I've looked into converting its VGA signal to a CGA output,...
11 votes
1 answer
2k views

What's the name of this Apple monitor

Browsing through retrocomputing resources, I recently stumbled upon this picture: I'm familiar with quite a few Apple II monitors, but it's the first time I saw this one. There's an Apple logo, so it ...
13 votes
2 answers
2k views

Samsung SyncMaster 3 cannot show resolutions up from 800x600 despite manual saying otherwise

I am in the proud possession of a Samsung SyncMaster 3 monitor. In the reports and in the manual it says it can run 1024x768, but I cannot for the life of me make the resolution higher than 800x600. ...
0 votes
0 answers
242 views

HDMI to SCART - Using Mega Drive (Genesis) Mini with CRT

I have a Mega Drive (Genesis) Mini that features an HDMI output that I would like to use on a CRT TV I have with a SCART input. Ideally I would like to convert the HDMI to RGB SCART for the best ...
7 votes
3 answers
971 views

Did any computer systems connect "terminals" using "broadcast"-style RF to multiplex video, and some other means of multiplexing keyboards?

Rendering a screen full of text as a video signal required a substantial amount of circuitry, especially in the era before LSI semiconductors. A device to generate display signals for a moderate ...
11 votes
2 answers
1k views

What causes the monitor to reduce to four lines on BK 0010 Focal?

When working with the Focal cartridge inserted on my BK 0010, the area displayed on the monitor suddenly reduces to just four lines , instead of the usual 20 Each time this has happened when I've ...
22 votes
6 answers
7k views

Why did some video games apparently use "interlaced" video modes?

I was under the impression that "interlaced" video modes was only a thing for remote television content because it saved bandwidth to only send 50% of the data to the homes, so you could fit ...
7 votes
3 answers
1k views

Sending video to Telerate 9" Green Monitor [closed]

I found an old Telerate green monitor at a thrift store and figured I could run my computer output through an HDMI -> AV converter with no problem, or a Raspberry Pi composite output signal. Turns ...
2 votes
0 answers
301 views

Does anybody have information on this tube?

I need to know if this is a color or monochrome tube. It’s in an applecolor A2M6020
0 votes
1 answer
303 views

A2M6020 AppleColor monitor not showing color

When I got my Apple IIc computer, it came with an A2M6020 AppleColor 13" NTSC composite monitor. However, I have not been able to get color working on it. I don’t know if it just has a monochrome ...
14 votes
3 answers
5k views

Which font with slashed zero is being used in this screengrab?

Do you know which font is being used in the video here: https://www.youtube.com/watch?v=xnudvJbAgI0? A screengrab of the video that shows a lot of text: We can see that the zeros are slashed, so it ...
16 votes
2 answers
7k views

What is the difference between the Commodore 1701 and the 1702?

Among the monitors offered by Commodore were the 1701 and the 1702, which, to my recollection, looked pretty much identical. Were there any cosmetic, functional, or other differences between the two?
2 votes
3 answers
7k views

Fixing the horizontal size(width) of an old CRT monitor (Zenith ZCM 1390-E)

This is my first post. I looked around on the net for awhile and came across this board - looks to be the most competent, so here goes. I managed to get my hands on an old computer monitor from my ...
5 votes
0 answers
256 views

Atari SM144 Horizontal lines after turning off then on

I recently bought an Atari SM144 monochrome monitor so I could play with an old Atari ST. It works to a certain degree, it turns on all good and I can play for a while, but after some time it gives ...
6 votes
3 answers
2k views

Why not SCART for early color monitors

By the early eighties, it was starting to be considered desirable for computers to have color monitors. Home computers often made do with a TV set and accepted the consequent low resolution, but ...
1 vote
0 answers
184 views

Monochrome CRT, words are wavy and sometimes move forward and backward, what could be the issue?

Monochrome CRT characters are not stable and rather shaking or waviness in them, sometime feel like moving forward and backward. Issue is in the high voltage power supply but what could it be, do high ...
6 votes
3 answers
583 views

Could monochrome systems produce better output for monitors than TV sets?

Many classic computers could optionally use a TV set as the display. At least in the early (pre-SCART) days, the TV would typically only have RF input, but if you were using a monitor, you could get a ...
8 votes
2 answers
1k views

Why did CGA RGBI output leave DAC to the monitor?

CGA on the original IBM PC produced sixteen colors, one bit each for red, green, blue and overall intensity modifier. The preferred output device was the later-arriving 5153 color monitor, which ...
0 votes
1 answer
784 views

Why did my CRT TV back in the day have such noisy RF picture on the NES when a same-age one does not today? [closed]

Back when the NES was current, I got one for my birthday. I connected it using the RF thingie to my cheap noname 14" CRT TV bought a couple of years earlier, in the late 1980s or 1990 or so. The ...
1 vote
0 answers
84 views

How can I find the specifications and manual for a JVC AV-S280ENT CRT TV? [closed]

I've just "struck gold" (in my world...) by finding an old CRT TV placed in the garbage room of my apartment complex. Didn't think that was ever gonna happen again. Anyway, as logic dictates,...
33 votes
6 answers
9k views

Why were animated screensavers used instead of a black screen on CRT monitors?

Before the advent of modern monitors, CRT technology was used, which was vulnerable to screen burn-ins. Screensavers avoided these problems by producing animations instead of persistent images. Were ...
6 votes
1 answer
534 views

Were vertical monitor arcade games programmed differently from those with horizontal monitors?

Many classic arcade games like Pac Man (Namco 1980), Assault (Namco 1988), Mercs (Capcom 1990), etc, use a monitor oriented vertically. I assume that they used the same physical hardware, with the ...
6 votes
2 answers
523 views

Were there any square monitors other than PLATO?

The PLATO multiuser interactive computer system used – and indeed invented for this purpose – a plasma display, whose key selling point in the late sixties was that it did not need refresh, therefore ...
2 votes
2 answers
2k views

Timeline of progressive scan CRT resolutions

In chronological order of roughly1 increasing total pixel count (world record style), please list progressive scan raster CRT monitors (not vector monitors) that were in production (not prototypes). ...
2 votes
0 answers
259 views

How to adjust RGB in an old CRT monitor (Samsung SyncMaster 753s) where the on-screen controls do no have the provision?

I just love CRTs. The have used LEDs and LCDs monitors but non of them have the high quality picture which a CRT monitor produce. In CRTs the color reproduction is very nice and also the brightness ...
11 votes
1 answer
2k views

Why was the Microvitec Cub monitor made of metal?

In British schools in the early eighties, the iconic microcomputer was the BBC Micro, typically connected to the equally iconic Microvitec Cub color monitor, as described in this video. Why this ...
44 votes
4 answers
15k views

Why did 80x25 become the text monitor standard?

Prior to the 1981 release of the IBM PC, the VT05 (72x20 1970), VT50 (80x12 1974), VT52 (80x24 1975), and VT100 (80x24 1978) text terminals were used on many Unix machines and the PDP-11 (probably the ...
2 votes
2 answers
406 views

Atari ST colour rendering

In the late 80's, I had an interesting incident with an Atari ST that I've never really understood. I was using some graphics software that I recall was very similar to the way Microsoft's Paint still ...
6 votes
3 answers
1k views

How to connect an HX-20 to a monitor via the RS232 port?

Using & Programming the Epson HX-20 Portable Computer by Eric Balkan has a tantalising passage on p. 172*: T.L. Ronson of the HX-20 User's Group also notes that a monochrome monitor can be ...
12 votes
8 answers
3k views

What are principles of vector CRT display? Simplest way to drive CRTs? [closed]

I am into playing with TTL to build 1970s style minicomputers. Aside from talking to them via some serial (or parallel) I/O port to a terminal, I am wondering about display output. This here is about ...
5 votes
2 answers
512 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 ...
6 votes
4 answers
604 views

What monitor could render APL2 characters in 1985?

BACKGROUND: In 1985, I took an evening class in APL at the local IBM as part of a high school Explorer Post (which was really cool, these guys giving up their time to teach us programming). Other ...
1 vote
1 answer
394 views

Why might my CRT fry any HOT I put in it? [closed]

This CRT is a Hyundai HN-4850, sold under the brand name KTX. A while ago, I fed it a video signal at a greater frequency than it was designed to handle, and after a spell of cutting out, jerking ...
15 votes
4 answers
2k views

Did Apple bundle a specific monitor with the Apple II+ for schools?

Sometime in 1980 (or maybe 1981) my school district purchased its first batch of Apple II+ computers. I remember vividly they had absolutely no idea what to do with them, and so the machines were ...
1 vote
0 answers
547 views

Identify Toshiba CRT

Didn't find anything with a search and need to replace the tube due to it being severely burnt in.
5 votes
0 answers
260 views

What is the model of the Emachines Etower 366i2's Monitor?

I've an old 1999 Emachines Etower I want to restore. I have all the original parts except for the monitor. It just isn't a complete set without it. Does anybody know the specific model of that monitor?...
7 votes
1 answer
451 views

Does the Atari 1040 STE work with the Atari SM124 monitor?

I have an Atari 1040STE. I'd like to use it with the Atari SM124 B/W monitor but I'm not sure it will work. It's my understanding that the Atari SM124 works fine with earlier Atari ST models, but when ...
11 votes
1 answer
2k views

Monochrome CRT Repair - Horizontal offset

My CRT all of a sudden is shifted to the right. I cannot adjust it via the adjustment potentiometers, nothing changes when these are turned. If I increase the brightness, the whole screen turns green (...
6 votes
6 answers
2k views

Ideal resolution for color computer on PAL/SECAM

Suppose you were, in the early eighties, designing a color computer to run on an PAL TV with a free hand to choose the specifications within the limits of the technology of the time. What would be the ...
0 votes
1 answer
3k views

Is there such a thing as a modern-manufactured, flat, fake CRT TV? [closed]

CRT TVs were great, and an absolute must for all classic video games. However, it cannot be denied that it's impossible to buy a new CRT TV today, at least in any kind of normal store, and you rarely ...
5 votes
3 answers
811 views

Performance characteristics of the DEC Type 30 graphical display

The DEC Type 30 was an early vector graphics display, that was used for an astonishingly wide range of applications for the 1960s. It used a 16-inch circular CRT with high persistence phosphor ...
3 votes
1 answer
348 views

CRT Mitsubishi Diamond Pro 1000 black screen: flashes BIOS logo during boot, but otherwise black

I received this off eBay yesterday and the seller had showed images of it working. The CRT shows many signs of life, I hear static when it turns on, a sound when I switch resolutions, the degaussing ...
4 votes
3 answers
935 views

Early vector computer displays: off-the-shelf oscilliscope, or custom built?

Some early computers had vector displays, which allowed the computer to draw graphics by steering a cathode-ray beam. Some examples include the Whirlwind, TX-0, TX-2, and PDP-1. It would be easy for ...
8 votes
4 answers
3k views

Choosing a monochrome color at the monitor?

A monochrome monitor displays only one foreground color and one background color. Usually the monitor was manufactured to produce only one color, which was cheaper (both CRT and electronics) than a ...