Questions tagged [graphics]

For questions regarding graphical - as opposed to text - processing and display.

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1answer
366 views

Usage of Windows default 20-color palette

Currently I'm digging in the history of computer graphics and found the Windows default 20-color palette. It's based on the Windows and IBM OS/2 default 16-color palette but has the four additional ...
9
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1answer
614 views

How did the ITT 2020 graphics differ from the Apple ][?

Following on from this question about Apple ][ graphics: What makes slot 7 of the Apple ][ unique from 1-6 and how was this used? The original Apple ][ microcomputer was released for the US market ...
8
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1answer
5k views

Did any PS1 games use 640x480?

I'm used to the idea that the maximum resolution there was any point in trying to generate on NTSC TV sets was about 320x224 (or 240 as a compromise figure between NTSC and PAL), but according to ...
8
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1answer
671 views

Was there ever a functional EGA emulator for the Hercules graphics card?

I used to use a CGA emulator (don't remember which one it was), that could show some gfx even in EGA/VGA-only games (when I selected EGA mode). I remember my frustration seeing some garbled graphics ...
8
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3answers
355 views

Slideshow software for Apple II?

I'd like to do a presentation using my Apple //e as the video generator. Is there any good "slideshow" or presentation software for the Apple //e other than writing a BASIC program to draw on the HGR ...
8
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1answer
1k views

Why does the Applesoft BASIC have shapes?

Why did Apple include shapes in Applesoft BASIC? There are no sprites on the Apple II, but shapes provide a simple vector drawing tool. As graphics go the shapes are kind of an odd duck, they provide ...
8
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1answer
465 views

Is "scroll tearing" a symptom of scanline interrupts taking too long?

I was trying to implement multiple LYC IRQs to implement faux parallax effects (like in Game Gear Shinobi), and my method was to begin LYC interrupts at a particular scanline, say about halfway down ...
8
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1answer
836 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 ...
8
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1answer
454 views

Which computers used the Intel 82786 graphics chips, and what sort of commercial success did that chip attain?

In the late 1980's, Intel offered the 82768 graphics chip, with specific support for windowed environments. I remember it being covered in Byte magazine, but don't remember seeing any applications of ...
8
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1answer
905 views

Why was the Nintendo 64 bad at textures?

The Nintendo 64 had a reputation for being great at drawing triangles, but not so good at texturing them, so that many games fell back on heavy use of untextured (though Gouraud shaded) triangles, ...
8
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1answer
292 views

BBC Micro split mixed graphics modes, could Mode 7 teletext be mixed with them?

The Elite computer game was one example of different graphics modes being on the screen at once: Mode 4 (monochrome, 320x256) for the main wireframed vector graphics game play and Mode 5 (4 colour ...
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3answers
877 views

Why do we need to acknowledge the interrupt from VIC-II?

A page on how to do raster interrupts includes the following code Irq: LDA #7 STA $D020 ; Turn screen frame yellow LDX #90 Pause: DEX BNE Pause ; Empty loop that "...
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3answers
1k views

Is there really 1MiB of physical memory in the motherboard of a PC AT/XT?

This is a question that has been puzzling me for a while. What happens with devices like graphic cards that have their own memory chips? Do these cards read/write from their own internal memory to/...
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3answers
1k views

Can the Commodore 64 display 26 rows of text?

I seem to remember some demo, or a game, which displayed 26 rows of text (that's one more than the usual text mode resolution of 40x25). My memory of it is very hazy, but at least is corroborated by ...
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5answers
2k views

An old DOS application that allowed to create cards, posters, invitations, etc

I remember an old (90's) program, run in DOS, that allowed its user to create posters, invitations, cards, etc. It had mouse support and its own GUI with windows, bars, fields, etc. The work started ...
7
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2answers
542 views

Could a 6502 use different speeds of RAM in a single machine?

I'm not sure I've entirely formed the idea in my head, but I'll ask anyway... One of the things I learned here in RO is that the BBC gained speed by using faster RAM, thereby avoiding cycle stealing ...
7
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1answer
233 views

What exactly could cause corrupted graphics in WinG performance test?

Wikipedia article for WinG says the following: WinG would also perform a graphics hardware/driver profiling test on the first execution of the program in order to determine the best way to draw DIBs. ...
7
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1answer
486 views

Is there a comparative analysis of the evolution paths of chips inheriting from TMS9918?

This is primarily about VDP from the Sega Master System game console and video chip from the MSX 2 series computers. Specifically about Yamaha YM2602 (aka Sega 315‑5124) and Yamaha V9938 respectively. ...
7
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1answer
248 views

Was there an Evans & Sutherland display system capable of rendering ordinary data as motion through a landscape?

Around 1987, the investment bank I worked for had a high-end graphics device, possibly from Evans & Sutherland, which produced an "animated" display not unlike the view from the front ...
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7answers
2k views

What systems had the lowest resolution ever that still allowed games to be made?

Just for fun, I wrote my own Chip8 interpreter/emulator and it works. The point is that it works in the terminal, meaning that a pixel is rendered using curses and a # character. For the Chip8 that'...
6
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4answers
2k views

What is the (usually lower quality) "software rendering" mode visible in so many "second-generation" FPS games?

During a conversation, a friend of mine sent me this picture: It's the first Thief (I guess), with so-called software rendering. I already experienced this effect in Quake 1-2 and to an extent, in ...
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4answers
903 views

How to use HGR2 (or HGR) on an Apple II

I am a big fan of the TV show lost, and I was trying to make the Dharma Initiative logo. But at certain point I couldn't add new lines of code and the final part of the logo was cut off. I tried to ...
6
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4answers
2k views

High-end PC graphics circa 1990?

I remember CAD being a major driver for PCs with high-end graphics cards; specifically AutoCAD was rising quickly in popularity around 1990 as PCs were able to compete with very costly CAD ...
6
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4answers
795 views

Hercules to COM<->USB adapter - is it possible?

I have a 486 (also another 286 mainboard) with a Hercules card, the plug is the same as RS-232. Is it possible to connect the output with serial port USB adapter and simulate Hercules-compatible ...
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2answers
1k views

How to exactly sync to the raster line for a vertical raster split?

Motivated by Wilson's question Can a Commodore 64 use two screenmodes on one scanline? I tried to implement a simple example that polls the beginning of a rasterline and then switches the screen mode ...
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2answers
2k views

What was the dithering algorithm used in Sierra and LucasArts games?

I am trying to write a program in C# that will re-create the type of dithering used in many of the old Sierra and LucasArts games. I have looked up many different dithering algorithms and none seem to ...
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3answers
477 views

Opening or converting GFA Basic files to something readable?

There is a bunch of GFA BASIC for Amiga files (the source code for Blender's ancestor, Traces, downloadable here: http://zgodzinski.com/blender-prehistory/) that I would like to peek at. Despite my ...
6
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3answers
302 views

How were "catalog" picture files created? [closed]

Back in the 1990s there were CD-ROMs containing a large collection of pictures split across several folders, where each folder would have a "catalog" file at the top. This file was basically ...
5
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3answers
685 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 ...
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3answers
499 views

Do 3d consoles run OpenGL?

I am talking about the earliest days of the first generation of 3d game consoles, such as the Playstation, N64 and Sega Saturn. Now these consoles are like a pc, the ps3 (and 4?) run OpenGL, and Xbox ...
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3answers
528 views

How did 1980's 8 bit video game coders create realistic fireballs and explosions?

Back in the 1980's, I tried my hand at programming video games, mostly using Atari's player/missle system which used sprites. I could freehand draw most sprites but couldn't come close to the animated ...
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3answers
506 views

How does the PMD 85 display colour or greyscales?

I stumbled across this computer in an article on hackaday, Home computers behind the Iron Curtain and since it has this bizarre resolution, I looked closer into it. Some claims from Wikipedia: ...
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2answers
1k views

How were individual bit planes scrolled on the Amiga (OCS)?

Back in my early Amiga days (A500), I remember coding simple demos that would use the dual-playfield mode and scroll them around (at a sweet 60FPS). It was pretty trivial to do with languages like ...
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2answers
1k views

Graphics Editor for 16-Bit Games

Which programs or tools were used to create the sprites and backgrounds for 16-Bit games like those on the Super Nintendo or the Sega Genesis?
5
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2answers
652 views

How 3Dfx Voodoo 1 Emulator works

reading of this question brings up 3Dfx Voodoo 1 Emulator in my memories. I always wandered how did it work so good time as any to ask... My memory is hazy on the details so I might miss remember ...
5
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2answers
536 views

NEC PC-88 video mode and resolution in games

I learnt that there are 4 video modes as described on wiki. I came across many games for the PC-88, like Thexder (1985), which are in the aspect ratio of 4:3 and in more than 2 colors. I don't ...
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2answers
723 views

Two graphics cards for retro gaming

I'm considering installing two graphics cards in my retro gaming setup (one AGP and one PCI) and was wondering if there are any drawbacks to doing so? The main things I'm thinking about are power ...
5
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1answer
209 views

Multi-GPU PowerMac G5?

I’ve got a 2005 PowerMac G5, Dual 2.3 GHz with a stock Nvidia GeForce 6600 running OSX 10.4 Tiger that I enjoy experimenting with, purely for fun and to learn writing legacy software in XCode. Would ...
5
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1answer
253 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 ...
5
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1answer
278 views

Did the Tiger Game.Com include any hardware accelerated graphics?

I stumbled upon screenshots of the Tiger Game.Com handheld running its Resident Evil 2 port and I'm curious to know what its graphical capabilities actually are: (from: https://twitter.com/_Kimimi/...
5
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1answer
269 views

Why are the CBM control codes for color setting so spread out?

The control codes (my C64 handbook actually calls them ASCII codes) for color changing on the Commodore 64 are as follows: Color Control Code Color number BLACK $90 0 ...
5
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1answer
284 views

What kind of graphics hardware did Nichibutsu's 1985 arcade game "MagMax" use?

The arcade game MagMax by Nichibutsu came out in 1985 and features for its time an impressive 3D scrolling effect which, in my observation, is not widely discussed yet, although it should be ...
5
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1answer
345 views

Strange visual behaviour on SGI IRIX

I've installed IRIX on SGI Octane and have screen looking like this: (I mean the stripes on all elements of the screen, which doesn't seem as a result of CRT monitor - the screen looks normally on ...
4
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1answer
393 views

How is the 320x200x16 graphics mode mapped in the IBM PCjr?

I've read that the PCjr supports a 320x200 pixel mode with 16 colors. But what I can't seem to find is how much memory that takes, how it's organized (chars?) or where it's located in memory. I'm ...
4
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1answer
631 views

Is screen wrap on the NES a fault of the OAM?

On NES games such as The Legend of Zelda and Metroid, entities that get to close to the edge of the screen, whether that be the top, bottom, left, or right side wrap around to the other side of the ...
4
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1answer
773 views

SNES / old graphics: merging sprite's with background [closed]

I have one question about how old computers or consoles like Super NES merged background layer(s) and spirites. Or another way - how layers were merged to not overload a PPU / CPU? OR how about ...
4
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1answer
230 views

Apple IIc : displaying HGR page 1 in AUX memory

I need to display HGR page 1 ($2000 to $3FFF) located in AUX memory (not in MAIN memory). According to the "Apple IIc Reference Manual - Volume 1", page 45, I must first turn 80Store on by ...
4
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2answers
362 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 ...
4
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1answer
390 views

Identifying an old one-bit image file format

I've found some code for reading an old image format, and I'm trying to figure out what format it is. Attributes of the file format I've deduced from reading the code: The image file begins with a ...
4
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1answer
354 views

Hardware implementation of the isometric tile engine. Is it possible, did it exist?

We are talking about a hardware (and not software over hardware, as for example in some games on the SNES console) tile engine with multi-overlapping rectangular (rather than square, when the image ...