All Questions
24 questions
4
votes
1
answer
1k
views
Using the CGA/EGA/VGA planar graphics modes
I have trouble to grasp how to use colors in CGA/EGA/VGA video graphics modes. The video modes I'm particularly interested in are 0Dh (EGA 320x200) and 12h (VGA 640x480). Both of these modes have 4 ...
- 368
0
votes
1
answer
891
views
How do I color multiple pixels at the same time in x8086 assembly?
I'm using emu8086 on Windows 10 with VGA mode and 8-bit fixed RGBA pixel format, learning the basics of graphics and ASM just for fun. I found a way to draw one pixel at a time as shown in the code ...
- 17
4
votes
1
answer
580
views
color palette not working on certain colors in VGA
I'm trying to set the VGA(640x480x16) color palette in assembler on DOSBox but specifically colors 6, 8-F don't change. I have tried using interrupts and directly through ports both work for other ...
- 43
0
votes
1
answer
135
views
How can I use 1920x1080x16M graphics or similar with 16M color in Kernel C++? (VGA)
For example, I'm using 320x200x256 graphics (VGA)
unsigned char g_320x200x256[] =
{
/* MISC */
0x63,
/* SEQ */
0x03, 0x01, 0x0F, 0x00, 0x0E,
/* CRTC */
0x5F, 0x4F, ...
- 3
0
votes
1
answer
99
views
Unidentifiable video modes listed as supported under DOSBox
I have noticed something rather strange messing around in DOSBox with VGA/VESA programming.
Running the VESA BIOS function 01h, and then printing out the entries of the list pointed to by the value ...
- 838
-1
votes
3
answers
2k
views
Batch file to get all available graphics cards, add them to variables and output them
Several laptops now have two graphics cards and i need some help on how to add them to variables and output them onscreen or text file on a batch file.
On cmd i use wmic PATH Win32_videocontroller ...
- 1
1
vote
1
answer
816
views
VGA pixel grouping on STM32
I have some code that displays a single pixel on screen through VGA but am a bit stuck on how I could set multiple pixels on screen where I want them. I set up two Timers for Vertical Sync and ...
- 91
6
votes
1
answer
249
views
Mode X in Assembly x86-16, Why is plane 1 not printing and all the other planes are not in the correct order?
I am writing in TASM 3.0 on DosBox 0.74 and I am trying to write in Mode x (Tweaked 13h, unchained mode 13), but here you can see in the image, it's not quite right.
It seems that plane 1 (second ...
- 293
1
vote
1
answer
1k
views
Trouble drawing pixels in 640x480 16-color VGA mode
I am trying to draw a single red pixel in VGA video mode 12 in C. The code that I have written works as expected in video mode 13 (200p 256 colors).
volatile char *video = (volatile char*) 0xA0000;
*...
- 123
2
votes
2
answers
300
views
Why is the bitwise shift needed for VGA colors?
I’ve been following the Bare Bones kernel guide at https://wiki.osdev.org/Bare_Bones, and I don’t understand these methods. Could someone explain why the bitwise operators in the methods are necessary?...
- 329
3
votes
2
answers
1k
views
How do I print SVGA Info on the screen in tasm?
I am complete beginner to assembly, and graphics, any help would be appreciated. I got the svga info, but when i print it, it won't print anything. If anyone can explain why that would be great. Here ...
- 65
13
votes
1
answer
21k
views
Graphics mode in assembly 8086
I have a variable that is called average and in my DATASEG, it changes every time because the user enters a different input every time. What I want to do is to go to the graphics mode (VGA) and then ...
- 482
-3
votes
1
answer
2k
views
What is the difference between "Video Graphic Adapter" and "Video Graphic Array"
I'm bit confused that what is the difference between "Adapter" and "Array". Some Graphics oriented expressions include the first and other the second. Such as:
In VGA it's array:
https://en.wikipedia....
4
votes
1
answer
2k
views
How to find All Graphic Cards?
I used this code for finding graphic cards:
ManagementObjectSearcher searcher =
new ManagementObjectSearcher("SELECT * FROM Win32_DisplayConfiguration");
string graphicsCard = "";
...
- 527
0
votes
1
answer
1k
views
VHDL - reading from VGA's framebuffer
I have an FPGA school project and I'm having some problems. We're using Digilent's Nexys2 board (Xilinx XC3S500E FPGA).
We built a few controllers including VGA (640x480) with a framebuffer. At least ...
- 7