Questions tagged [video]

For questions regarding hardware and drivers used for video output.

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2 answers
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Why does my PlayStation RGB video cable cause the picture to be all orange-y unless pressure is applied?

In 2005, I bought an RGB cable for my old (~1996) PlayStation. It seemed to work at first. I don't remember when, but at some point, it started acting oddly. Since, whenever I plug it in, it displays ...
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35 votes
1 answer
7k views

In the classic "Windows 98 crashes live on CNN" video, why does the BSOD appear so oddly?

I've been seeing this since the late 1990s: https://www.youtube.com/watch?v=eKy9fV_zX_o Was this a hoax or joke of some kind? The only reason I ask is that, when the blue screen appears, it does so in ...
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3 votes
2 answers
282 views

Why did the COMX-35 video memory seem unreliable?

In my early days, many many years ago, one of the machines I managed to get my hands on was the COMX-35, a funky little machine based on the 1802 CPU. I remember trying to develop some games for it ...
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  • 2,386
18 votes
2 answers
2k views

What made the Amiga "Genlock-able"?

Right at the moment the original Amiga A1000 was being introduced, Commodore was already advertising its ability to use a Genlock peripheral, and promising that Commodore's own Amiga 1300 Genlock ...
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7 votes
1 answer
320 views

What causes the horizontal lines at the left of the Atari 2600 screen?

I occasionally see video captures of Atari 2600 games that have horizontal bars down most of the left-hand side of the screen, as in this video of Star Voyager by Imagic: It's not clear to me whether ...
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22 votes
4 answers
4k views

Why did the TRS-80 CPU have priority over the display?

The original TRS-80 had a separate bank of static RAM for video memory, so that there would be no interference between display and CPU when the CPU was just doing calculations in main memory. When it ...
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7 votes
4 answers
646 views

Is "component video" synonymous with "RGB"?

Before asking this, I read the Wikipedia article. I've been confused about this for many, many years. I'd like to finally get it straightened out. What exactly is the difference between "RGB"...
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  • 87
16 votes
4 answers
3k views

How were the special effects achieved for the Kraftwerk Die Roboter 1978 music video?

The following video for Kraftwerk's Die Roboter is very interesting because it features some effects which I think might require a framebuffer to achieve. Having a framebuffer in 1978 would to my ...
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5 votes
2 answers
376 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 ...
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16 votes
2 answers
1k views

What is an XRGB video signal? (NOT the modern XRGB mini-DIN.)

I have a mid-1980s CRT monitor, a C. Itoh Chroma Pro CM1000, with an 8-pin DIN RGB input that's visually similar to the digital RGB input on a Commodore 1084. The input is selectable between "RGB,...
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4 votes
2 answers
285 views

Is a S-VIDEO-to-RCA cable worse video signal quality than an S-VIDEO-to-SCART cable?

When I got my Sega Saturn way back, it came with a video cable that is S-VIDEO in the Saturn end and SCART in the TV end (no adapter). It has always given me very crisp and nice picture on all the TVs ...
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20 votes
6 answers
5k 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 ...
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7 votes
2 answers
432 views

Monitor can't display boot/DOS video mode making dual boot impossible

I have an HP ZR24w monitor connected via HDMI input to a newer custom machine running Win7, and via VGA input to an older Micron machine running Win98SE. I use the monitor's "source" setting ...
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  • 71
7 votes
1 answer
720 views

What is the name of the video signal recognized by this monitor?

I have a hobby project with an old CP/M-80 system where the monochrome monitor is showing its age as the image is flickering a lot. I was wondering if I could attach a modern monitor or tv-screen, ...
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4 votes
3 answers
523 views

Were there low-end eighties computers that used dual-ported video RAM?

Going through schematics of several home or small office computers of the era, I was wondering why almost none of them (1) used dual-ported video RAM. I understand that those chips were initaly ...
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9 votes
2 answers
483 views

Did any ZX Spectrum clones use a 16 bit datapath between memory and video generation?

On the Commodore 64, there is a 12 bit datapath between memory and the VIC II: the ordinary screen data, which is in DRAM, and another 4 bits which comes from another SRAM chip which may be paged into ...
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13 votes
5 answers
4k 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 ...
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  • 2,438
23 votes
8 answers
4k views

Why did the VIC-20 and C64 have only 22 and 40 columns when the earlier PET had 80 column text?

When I was a kid, the "real" computers in movies looked so cool with that 80-column monochrome green text. My first computer was a VIC-20 and it always felt very "toy-like" to me ...
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  • 465
0 votes
1 answer
220 views

Workbench 3.1 Chipsets and graphics question

I have Workbench 3.1 install with Scalos and some other tweaks installed from scratch using one of numerous online guides. My machine is a CDTV with 3.1 Kickstart, TF536 030 MMU 64MB RAM. The chipsets ...
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1 vote
1 answer
469 views

RGBI to VGA converter [duplicate]

Is there an off the shelf converter / adapter from C128 RGBI to VGA that will work with modern-ish low voltage VGA?
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1 vote
1 answer
201 views

Operating system/hardware used for playing a video during a recorded trial that took place in 2013 [closed]

I am watching a 2013 murder trial on YouTube Jodi Arias Trial : Day 23 : 1 Of 3. There is a considerable amount of evidence involving phones and computers. The following picture briefly appears on-...
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5 votes
1 answer
269 views

Did the Power Macintosh 8500 have accelerated blitting?

Looking at online specifications for the Power Macintosh 8500, I was able to find few details on its graphics capabilities beyond quantity of VRAM and supported color depths, refresh rates, and ...
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  • 153
6 votes
1 answer
410 views

Are there any 1980's video chips still available besides the TMS9918?

The TMS9918 is still available, which is nice. But are there any other (better) video chips still on the (after-)market in any numbers? Obviously Commodore's VIC-II is not one of them.
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5 votes
2 answers
1k views

Sony PVM Connections / Composite Signale

I am trying to learn more about different video formats. I have a SONY PVM9044QM and want to understand the different connection options. So I understand, that Y/C equals S-Video input. But what does ...
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3 votes
1 answer
367 views

What old version of Windows provides out-of-the-box DVD movie playback?

I bought a Playstation 2 in 2000, which famously included a DVD drive capable of playing DVD movies. I wanted the same movie playback capability on my Windows 98 PC. As I recall, I mistakenly thought ...
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4 votes
2 answers
380 views

Vintage computer composite graphics

I am working on designing a vintage computer and I have been using the TMS9918ANL. After working with it for a month or two and not making much progress, I really want to switch to another chip. I am ...
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9 votes
1 answer
877 views

What kind of 256 color palette did the Enterprise 64/128 have?

The Enterprise 64 or 128 Home Computer apparently had a palette of 256 colors. However, that is pretty unusual and doesn't fit evenly into the typical 3 channels for RGB. Wikipedia doesn't provide any ...
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11 votes
2 answers
272 views

Which addresses does the Motorola 6845 CRTC output during retrace?

I'm trying to understand how the video hardware (CRTC and Gate Array) in Amstrad CPCs works. Specifically, I have a question about the behavior of the refresh memory addresses and row adresses output ...
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  • 497
8 votes
3 answers
1k views

Why does the Amiga 500 have half the HSYNC pulses seperately compared to those in CSYNC?

After many years I bought myself a new old Amiga 500 (rev 5) and wanted to hook it up to an LCD monitor (Samsung Syncmaster 152N) that has a VGA input. I tried hooking it up directly by making an ...
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9 votes
2 answers
2k views

Is there a generic VBE driver available for Windows 3.x?

I’d like to run Windows 3.11 on a relatively modern laptop. One problem I have is that the only display driver that works with my hardware is the basic VGA driver, which only supports the rather ...
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6 votes
1 answer
611 views

Was it ever possible to access the full EGA color space in 200-line modes?

It's long been an established fact that the EGA only had four memory planes, which limited the number of colors on the screen to (24) 16. The best compatible monitors at the time had six TTL color ...
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  • 1,441
3 votes
1 answer
161 views

`DRAW` instruction timing

I asked a question here about CHIP-8 instruction timing, and this answer mentions that DRAW waits for vblank: For Chip-8 code that draws anything, the limiting factor will be the wait-for-vblank that ...
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  • 2,533
11 votes
2 answers
1k views

Could CGA synchronize with vertical blank?

According to http://www.vcfed.org/forum/showthread.php?62049-The-myth-of-the-vertical-retrace-interrupt-on-EGA-VGA IBM first implemented a vertical retrace interrupt on the PCjr in 1984. That ...
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  • 49.3k
33 votes
3 answers
12k views

Why do PCs boot in 720x400 resolution?

Using my 21" Trinitron OSD, I can see that the resolution at boot is 720x400. From memory, this weird resolution is extremely uncommon if ever to be seen as a choice on software that supports ...
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  • 5,786
6 votes
1 answer
276 views

How exactly does Leningrad contend the memory?

From what I understand of this answer, the Leningrad delays the Z80 during the M1 cycle so that the video generation circuitry can do its thing. I can see how M1 is "latched" (don't know if that's ...
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  • 34.3k
1 vote
0 answers
367 views

Thinking through the design of a TTL video card: what memory chips and how to manage memory? [closed]

Inspired by Ben Eater's "Let's build a video card" aka "World's worst video card" two part projects on YouTube, I was inspired to consider designing a display adapter for my passive backplane TTL mini-...
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6 votes
1 answer
494 views

What role does the 4-bit shift register play in the Leningrad video generation?

The Leningrad contains a shift register1, which I believe is loaded with data from the bitmap. This part loads 8 bits in parallel, and shifts each bit out in turn on the rising edge of a clock signal. ...
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  • 34.3k
0 votes
0 answers
142 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 ...
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35 votes
2 answers
3k views

What mid-1970s to mid-1980s home computers had their graphics characters added to Unicode 13?

The Unicode 13.0.0 release notes mention among the symbol additions: 214 graphic characters that provide compatibility with various home computers from the mid-1970s to the mid-1980s and with early ...
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  • 2,591
6 votes
3 answers
892 views

How does the Apple II read lines for video display from the text-mode frame buffer?

(This question applies also to the low-resolution graphics video buffer, since that uses the same frame buffer as text mode, just displaying it differently.) As described on page 1-12 et seq. of The ...
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  • 21k
10 votes
4 answers
3k views

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

I just love the Snow White industrial design language of the Apple IIc, especially when paired with the Monitor IIc. It is a classic design that doesn't show its age. I've even recently seen them ...
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  • 322
5 votes
2 answers
996 views

Could early nineties PCs access raw CD bitstream?

In the early nineties, as discussed in What specific technical advance(s) allowed PCs to play "Full-screen full-motion" video? it became commonplace for PC games to use the storage capacity ...
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  • 49.3k
18 votes
2 answers
4k views

How did the Sega CD decompress video?

In the early nineties, Sega released the Sega CD, a.k.a. Mega CD, an add-on that attached a CD-ROM drive to the Mega Drive a.k.a. Genesis. Its primary or at least most conspicuous use was for full-...
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  • 49.3k
3 votes
1 answer
586 views

What is the format of the Apple 1 character set ROM?

What is the format of the video character ROM used in the Apple 1?
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  • 21k
18 votes
7 answers
3k views

Cost of unrestricted sprites

All the game consoles of the second through fourth generations, and several early home computers, had sprites, which were valuable though costly, e.g. the VIC-II spent 2/3 to 3/4 of its area on ...
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  • 49.3k
5 votes
2 answers
313 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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  • 49.3k
7 votes
2 answers
739 views

What was the title safe area on PAL TV sets?

Computers that used TV sets for display, needed to worry about the title safe area. By consensus, on NTSC sets, it was 200 scan lines, or 192 if you wanted to play it really safe. What was the ...
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  • 49.3k
15 votes
1 answer
1k views

How did the Apple 1 video circuit work?

One of the major innovations of the Apple 1 when it was released in April 1976 was that instead of using a serial interface requiring an expensive external terminal it had a built-in 40×24 text video ...
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  • 21k
5 votes
1 answer
681 views

(How) can I boost my ZX81 video output with an external device?

I bought a small LCD TV today in part to use with my retro computers. My Sinclair ZX Spectrum 48k works perfectly with it - I can manually fine tune Channel 36 as shown in this video. With the ZX81 I ...
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  • 2,009
9 votes
2 answers
2k views

What was the screen refresh rate of the Lisa and original Macintosh?

According to https://www.folklore.org/StoryView.py?project=Macintosh&story=Joining_Apple_Computer The Apple II displayed white text on a black background. I argued that to do graphics properly ...
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