All Questions
9 questions
3
votes
0
answers
401
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Trying To Understand DOS Game Assembly Instructions [closed]
I am trying to understand assembly language instructions, for a DOS Game. I have looked at the following Link :- https://atrevida.comprenica.com/atrtut07.html
reading about how VGA Graphics work in ...
- 31
9
votes
1
answer
853
views
Software that emulated VGA high res mode on an EGA board
I have this very faint recollection from my late elementary school days back in the end of 1980s of a very specific piece of MS-DOS software that claimed to do what was an incredible thing to an ...
- 739
15
votes
2
answers
2k
views
How to use "AND," "OR," and "XOR" modes for VGA Drawing
I've been trying to implement a blitter in MS-DOS, but before I do that I wanted to test the various graphics modes of the VGA graphics card. (I'm emulating using DOSBox.) According to this paper on ...
- 1,668
28
votes
7
answers
7k
views
How did DOS games manage to have multiple background layers?
Seems like VGA only has one background layer, it appears to be a typical bitmap screen like most home computers of the 80s (Amstrad CPC, Commodore 64 etc.) where each pixel's color is stored in a ...
- 1,668
7
votes
2
answers
724
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 ...
- 71
47
votes
4
answers
9k
views
How do DOS games like DOOM benefit from a PCI graphics card?
The original DOOM and its derivatives (DOOM II, Heretic, Hexen) were early 90s 3D games released at a time when DOS PCs usually had ISA bus Super VGA graphics cards. In the following few years, PCs ...
- 61.5k
13
votes
3
answers
4k
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?
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- 363
17
votes
4
answers
4k
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 ...
- 8,671
11
votes
5
answers
3k
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 ...
- 2,122