x86 programming for Ms Dos Computers in CGA , EGA and VGA!
| In these tutorials, we'll take a look at the early basic
machines, and learn how we can use Assembly to write games that can
be used in MSDos via DosBox! We'll cover 3 graphics modes...
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If you want to learn 8086 get the Cheatsheet! it has all the 8086 commands, It will help you get started with ASM programming, and let you quickly look up commands when you get confused! |  |
CGA color Palette
| Palette 0 Dark | Palette 0 Bright |
Palette 1 Dark | Palette 1 Bright | |
| 0 | ||||
| 1 | ||||
| 2 | ||||
| 3 |
EGA color Palette
The EGA system uses 16 colors - it's 320x200 can only use a palette of 16 colors (the same colors!)
Each color has a logical number from 0-16, and a Hardware number (used for palette definitions) from 0-63
| 0 – 0 | 1 – 1 | 2 – 2 | 3 – 3 | 4 – 4 | 5 – 5 | 6 – 20 | 7 – 7 |
| 8 – 56 | 9 – 57 | 10 – 58 | 11 – 59 | 12 – 60 | 13 – 61 | 14 – 62 | 15 – 63 |
Screen Layouts
CGA is a 2bpp screen mode, it's memory is at B800:0000h
EGA use 4 bitplanes, it's address is A000:0000... to change the bitplanes we need to OUT to 03C4h
VGA is a 8bpp screen mode, it's memory is at A000:0000h
| Bits | ||||||||||||
| Screen Mode | Bits per pixel | Pixels per byte | Address | Plane Mask | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| CGA – 4 | 2 bpp | 4 | B800:0000h | b1 | b0 | b1 | b0 | b1 | b0 | b1 | b0 | |
| EGA – 13 | 4 bitplanes | 8 | A000:0000h | out 03c4h,0102h | p0-b7 | p0-b6 | p0-b5 | p0-b4 | p0-b3 | p0-b2 | p0-b1 | p0-b0 |
| out 03c4h,0202h | p1-b7 | p1-b6 | p1-b5 | p1-b4 | p1-b3 | p1-b2 | p1-b1 | p1-b0 | ||||
| out 03c4h,0302h | p2-b7 | p2-b6 | p2-b5 | p2-b4 | p2-b3 | p2-b2 | p2-b1 | p2-b0 | ||||
| out 03c4h,0402h | p3-b7 | p3-b6 | p3-b5 | p3-b4 | p3-b3 | p3-b2 | p3-b1 | p3-b0 | ||||
| out 03c4h,0F02h | All-b7 | All-b6 | All-b5 | All-b4 | All-b3 | All-b2 | All-b1 | All-b0 | ||||
| VGA | 8bpp | 1 | A000:0000h | b7 | b6 | b5 | b4 | b3 | b2 | b1 | b0 | |
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Buy ChibiAkuma(s) games now!
If you want to support my work, please consider backing me on patreon!
Buy ChibiAkuma(s) games now!