Questions tagged [crt-monitor]

For questions regarding Cathode Ray Tube monitors

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0answers
85 views

Frozen horizontal width coil in old CRT monitor

I have an old Apple IIe CRT monitor which could use a small horizontal width adjustment. Unfortunately, as I try to rotate the hex key in the coil with a CRT adjustment tool, it doesn't want to move. ...
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1answer
128 views

What's the name and model of this computer monitor?

It's look like very old thing to me: It's in Black and White display. As you can see, it has a socket on the top of it . What's the name and model of this computer monitor?
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1answer
157 views

How picky are CRTs about power cleanliness?

How picky are CRTs about the 'cleanliness' of the mains power? Cleanliness referring to electrical noise from thing like ac motors in fridges, powerline ethernet, etc. Cleanliness is also referring ...
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1answer
407 views

What's the name of this CRT monitor?

What's the name of this output retro gaming monitor device? The following is a still from the Netflix production of 'Bandersnatch', a 2018 interactive movie, set in Britain, mostly in the year 1984. ...
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7answers
2k views

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

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 ...
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0answers
98 views

Siemens PG675 monitor problem

I have been working on an old Siemens PG675 and suddenly the monitor began to show a a distorted image (it shows this 1 when the should shows this 2). I could make a test of the screen, and it shows ...
4
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3answers
369 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 ...
3
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1answer
383 views

What 1970's terminal was black on white and had an orange keyboard?

In high school, I programmed on a terminal that was retro THEN, and I need help remembering make and model. White screen, black text (seemed very unusual to me), no lowercase, 24x80, and I have this ...
0
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1answer
180 views

4MHz Z80 timing and PAL video generation

Im trying to get some nice colored lines on some old Z80 system synced to the PAL screen, but having some sort of a problem. First I just need to know if my facts are right. I know that on Commodore ...
4
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2answers
336 views

What was the timeline for monitors becoming immune to physical damage from invalid sync values?

When I first got into using Linux around the turn of the millennium, XFree86 was still in use, with the associated use of the xf86config command to manually set everything up, and the warning that ...
9
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4answers
3k views

Is it possible to swap the Apple //c's monochrome CRT tube for a color one?

I just love the Snow White industrial design language of the Apple //c, especially when paired with the Monitor //c. It is a classic design that doesn't show its age. I've even recently seen them ...
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2answers
249 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 ...
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1answer
214 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 ...
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6answers
3k views

Did any computer allow overscan on a CRT monitor?

The issue doesn't arise on today's LCD screens, but on a CRT screen, because the edges are slightly curved, and you might not be able to be sure exactly how the individual screen is tweaked, it's not ...
7
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2answers
935 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 ...
11
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2answers
906 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 ...
5
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1answer
386 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 (...
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199 views

Identify Toshiba CRT

Didn't find anything with a search and need to replace the tube due to it being severely burnt in. [] []
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2answers
232 views

Non-obvious compatibility of M1297 monitor

I bought an Apple IIgs recently. I didn't do my research well enough and wound up with an M1297 monitor, which of course appears to only be compatible with Macintosh IIs and such, rather than the ...
11
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3answers
1k 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 ...
6
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1answer
406 views

Monitor for an SGI Octane?

I just found myself being the sudden and proud owner of two wonderful Silicon Graphics machines, an Octane and an Octane 2, both in quite good condition (in particular with very few scratches to the ...
3
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1answer
411 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 ...
5
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3answers
634 views

What's the difference between an IBM 5153 (CGA) CRT picture tube and a color TV picture tube?

The IBM 5153 Personal Computer Color Display was a monitor designed to accompany the original IBM PC (albeit released a couple of years later) and provide a color display at sharp enough resolution ...
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7answers
5k views

Was the picture area of a CRT a parallelogram (instead of a true rectangle)?

This may seem like an absurd question at first, but I've been giving it some thought and I'm genuinely curious about the design details of these devices. I was reading an answer on an unrelated Stack ...
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3answers
269 views

How were early computer monitor signals used to breach security? [duplicate]

In the mid 80's, several national news outlets showed people able to reproduce a computer's monitor's screen at least 100ft away. 1) How were early computers compromised like this? 2) Were there ...
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1answer
387 views

First Commodore 80-column monitor

While the Amiga could be used with a TV in a pinch, it was primarily intended for use with an RGBA monitor; memory says, and Google seems to confirm, that was the 1084. Commodore made color monitors ...
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3answers
5k views

What were other colors beside green and amber for monochrome monitors?

In a movie that unfortunately I don't remember the name of, a monochrome monitor using red shade was visible. I found that quite fascinating back then ! Beside green, amber and apparently gray, were ...
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0answers
264 views

Why the exterior of PC towers and monitors used to be white in the 90's and now is black? [closed]

White got dirty pretty quick. Why would they chose that color? And why MAC still keep it but other manufacturers do not.
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4answers
992 views

Retro emulation with perfect V-sync

I'm building an retro emulator to connect to a PAL (720x576i @ 50 Hz) CRT TV, and would like a perfect V-blank image, so the visuals are identical to original arcades and retro computers. In other ...
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2answers
337 views

CRT contrast issue: light grey on dark grey

This is on an IBM 5154. Dark grey next to light grey produces a white line between the two. This is noticeable on a color bar test, but is even worse in SimCity (making the text impossible to read). ...
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3answers
3k 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 ...
2
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1answer
265 views

Spying on old computer monitor RF signals [closed]

In the mid 80's, several national news outlets showed people able to reproduce a computers monitors screen at least 100ft away. How were early computers compromised like this?
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2answers
2k views

Safely adjusting CRT while it's on?

I have an old IBM 5154 monitor that works pretty well. It only has two issues: the screen is off-center and the color is too blue. I found a service manual for it that describes how to fix both of ...
3
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1answer
283 views

Why does my IBM 5154 have an undulating wave?

My IBM 5154 had some blown capacitors in the power supply (the AC line filters). It worked, though I decided I should replace the caps in the power supply just to be safe. I went ahead and replaced ...
9
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1answer
1k views

How to tell if glue or electrolyte leak from old capacitors?

I recently acquired an IBM 5154 EGA monitor that works pretty well. The only minor problem is that the screen is slightly off-center. I decided to take it apart to adjust it, but discovered that many ...
3
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2answers
488 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. ...
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3answers
1k 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 ...
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5answers
3k views

Can the wrong sync frequency really destroy a CRT monitor?

I've read in various places that an incorrect signal of the wrong refresh rate can cause physical damage to a CRT monitor, but I've never found an adequate explanation of why this is so. Is this true? ...
9
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4answers
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 ...
33
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3answers
8k views

Why did 80x25 become the text monitor standard?

Prior to the 1981 release of the IBM PC, the VT105 (72x20 1971), VT52 (80x12 1974), and VT100 (80x25 1978) text terminals were used on many Unix machines and the PDP11 (probably the most widely used ...
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3answers
543 views

High Voltage in Bell of CRT Tube?

I'm going to adjust the dynamic convergence and geometry on my CRT TV with magnets. However, my dad is very reluctant as he thinks the bell of the tube may have a high voltage current and that placing ...
3
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1answer
539 views

Weird Brightness Problem On CRT

My Panasonic CT-20S12S keeps slowly getting brighter and brighter, and I keep having to take off the back and turn down the SCREEN control. What's going on here?
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2answers
7k views

CRT Geometry Adjustment

My Panasonic CT-20S12S (20 inches, not 12 inches) has some pretty bad geometry in various parts of the screen. The edges of lines bow in or out, distorting shapes. How can I adjust the geometry on ...
5
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1answer
253 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 ...
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1answer
3k 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?
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2answers
1k 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). ...
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6answers
2k views

What monitor did Atari recommend for its 8 bit product line?

I am curious what Atari recommended to users as an appropriate monitor for their 8 bit computers (400/800/800xl/etc). For example, my Commodore 64 pairs nicely with a Commodore manufactured 1702 or ...
9
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1answer
448 views

Price of early color monitor versus TV

Some computers in the seventies and eighties had the option of output to either a TV or a dedicated monitor. Suppose repurposing an existing TV isn't an option and you are going to be buying a screen ...
7
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3answers
567 views

Connectors for green screen versus color monitors

Consider a pair of early 14" CRT monitors, one green screen 80x25 text, one color 640x480 graphics. It seems reasonable to conjecture that both could have the same resolution; at least if you suppose ...
16
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4answers
2k views

Computers with integrated monitor (all-in-one form factor)

The Commodore PET had an all-in-one form factor where the monitor was fused into the rest of the computer, making a single unit, not dissimilar to some early terminals like the VT100. This is ...