Questions tagged [vga]

For questions related to VGA signals, sources or receivers

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29
votes
3answers
4k views

Why did Super-VGA offer the 5:4 1280*1024 resolution?

PC displays almost always targeted 4:3 CRT displays. And indeed, VGA and most super-VGA modes had 4:3 aspect ratio resulting in square pixels - except the odd 5:4 1280*1024 mode. This mode even caused ...
22
votes
4answers
4k views

Why was NEC able to wrestle PC graphics standards away from IBM?

The dominant standards for PC graphics in the 1980s were the ones introduced by IBM. This included MDA and CGA with the original IBM PC, followed by EGA shortly after the PC/AT, and then VGA with the ...
19
votes
7answers
4k views

What video connections were common in Europe?

What video connections were common on European TVs and monitors during the "retro" era? In the USA, first there were none on TVs (RF screw terminals only) and monitors had composite (yellow RCA, CVBS)...
19
votes
3answers
2k views

Do all VGA cards implicitly support CGA and EGA?

Practically speaking, if I buy an ISA VGA card, will it implicitly support CGA and EGA games?
15
votes
2answers
4k views

Is the s-video output on the Commodore 64 different from “normal” s-video?

I saw Commodore 64 to modern TV about how to connect the Commodore 64 to a modern TV. I don't understand all the details of the answer, so I wanted to try and ask something specific here. In short, I ...
15
votes
3answers
3k views

With a 15 kHz video signal (240p or 480i), does VGA have any real-world advantage over S-Video?

It's difficult to find a modern LCD monitor that can display a 15 kHz signal through VGA, so I'm wondering if S-Video is just as good when displaying 240p and 480i? I've looked at screenshot and video ...
12
votes
6answers
4k views

Converting SCART to VGA/Jack

I have a few home-microcomputers that use SCART to output both audio & video to TV screens such as the Atari STE 1040 and the Sony MSX Hitbit 501. I don't have room to store old cathode-ray ...
12
votes
4answers
2k views

For fast scrolling DOS games, when was Mode13h preferred over Mode X?

Back in the DOS days of gaming (more specifically, 80286 - 80486 era), developers typically needed to choose between using the chunky and easier Mode 13h or the more complex "Mode X" that provided ...
12
votes
2answers
985 views

Acorn Electron to VGA/HDMI?

I am aware that there are answers regarding this but they do not seem to answer it for me. A few years back I got a Acorn Electron and it works using the arial for video fine, but I would like to ...
11
votes
1answer
2k views

Game Boy DMG to VGA

I have a Game Boy DMG with a broken screen that I want to turn into a small arcade machine, so I need to display the Game Boy screen on a bigger (computer) screen. I tried doing so with an Arduino. I ...
10
votes
5answers
2k views

Invert LCD screen in DOS 5.0

Would like to run "black on white" software on a DOS machine with an LCD screen, so am wondering if there are any TSR tools, or similar, for inverting the screen. I believe it is grey scale VGA, not ...
10
votes
2answers
1k views

What DOS games used Mode X as described by Michael Abrash?

In Michael Abrash's Graphics Programming Black Book, many chapters are dedicated to fast drawing of primitives, fills and copies using the 320x240 256-colour Mode X. What MS-DOS games used Mode X? ...
10
votes
2answers
645 views

Why are my VGA vram to vram copies so slow?

I'm doing some mode x programming and I noticed that my vram to vram copies are much slower than I expected. My copying method was described by Michael Abrash in his Graphics Programming Black Book ...
9
votes
3answers
2k views

What is the best option to connect old computer to modern TV

I was exploring different options of connecting both my Atari ST and C64 to a modern TV. I opted for a composite signal passed through a cheap AV to VGA converter, and although the display works, ...
8
votes
3answers
1k views

Why VGA framebuffer was limited to 64kB window?

VGA framebuffer was fixed to 64kB at A0000h. Right after that there’s MDA/CGA framebuffer at B0000h. I am not sure, but I recall VGA did have to support CGA and its framebuffer, but was there any ...
8
votes
3answers
749 views

Choosing a VGA card for the IBM 5162?

When shopping for a VGA ISA card, how might I know if it would be compatible with an IBM 5162? Do all 8-bit and 16-bit ISA VGA cards work, or only some?
7
votes
4answers
4k views

How can a Z80/8080/6502 use VGA?

I've come across a couple of projects that manage to get VGA working with the Z80 and similar CPUs: Veronica (6502 CPU, VGA signal generation by AVR) ZC160 (Z80 CPU, VGA signal generation by GAL) c-...
7
votes
2answers
599 views

Strange “snow” artifacts when dragging a window in 256-color mode

I picked up a nice Packard Bell Legend 245 over the weekend, and it works great apart from one issue so far: when dragging windows around the screen (Win 3.1), the screen gets corrupted with weird ...
6
votes
2answers
520 views

Commodore monitor to VGA or HDMI

I have this monitor, which I think is a Commodore 64 monitor. I would like to connect it to a pc. Anyone know how to convert VGA or HDMI to this connector format? I've tried searching, but so far I'...
4
votes
1answer
283 views

Atari 1040ST AV video output - blurred and jagged vertical edges

I have an AV cable that connects Atari 1040STE with a AV to VGA converter. For some reason the vertical edges are not sharp, rather jagged or pixelated. I red that old atari would have an issue with ...
4
votes
1answer
403 views

Which graphics adapters outputted S-Video over VGA?

To this day you can buy passive cables which separate out S-Video and composite signals from VGA. There's always a warning to check whether your graphics adapter output these over the VGA connector. ...
4
votes
1answer
253 views

Does a final version of the IBM VGA XGA Technical Reference Manual exist?

I'm doing some bare metal programming and I'm getting a lot of information from the IBM VGA XGA Technical Reference Manual May92 document. The only reference I can find about this document, is this ...
4
votes
1answer
328 views

What type of video card would be able to drive a VGA monitor that uses a standard HD 15 pin connector with a non VGA standard pinout?

I was browsing old FAQs on the wayback machine1 and noticed that it said some early Mitsubishi Diamond Scan monitors, and reportedly the Dell Ultrascan 17ES monitor2, use a standard HD DE-15 VGA ...
2
votes
1answer
384 views

Which retro personal computers, if any, can use a modern day monitor? [closed]

I play around with emulators, and would love to go back to my roots, with physical ZX81, BBC Micro, Amiga, etc. Unfortunately, those all require a TV as output. I suppose that I could buy a cheap one ...
2
votes
3answers
551 views

VGA controller for my W65C02 computer

I´m planning to build a small computer system, based on the W65C02 from Western Design Center. This computer system should also have a VGA interface with a graphic and a text mode, defined with the ...
2
votes
2answers
280 views

What are the HSync and VSync frequencies of these common VGA tweak modes?

Most VGA cards and monitors support additional undocumented resolutions, accessed by changing the VGA registers. Most are just variations on the regular modes (320x100 is the same as 320x200, but with ...
1
vote
0answers
151 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-...