Скачать или смотреть Retro days vol.1

Clase práctica que enseña a inicializar y programar de forma básica una VGA en modo real.

Retro Days GIT Repo : https://github.com/turric4n/Retrodays

Class Program : https://github.com/turric4n/Retrodays...

Important INFO :

{ Important things!!! FPC is a 32 bit compiler and default Integer type
is 32 bits. We will use 16 bit registers to program VGA (AX - AH,AL)
So, we need to pass 2 bytes Integer Types (smallint) to registers }

{ Things to know about VGA }
{ VGA memory is 64KB = 64000 Bytes }
{ IBM/AT VGA base memory address is $a000 }
{ VGA Mode 13h is 320x200 256 colors RGB "chunky graphics" can access video memory directly }
{ 320 * 200 is 64000 bytes. So EVERY Byte is a pixel on the screen }
{ Pixel is a Byte (0..254)
{ VGA BIOS Mode 13h (16 bit) address is $0013 load in AX and call int $10 }
{ VGA BIOS Text mode 10h (16 bit) address s is $0010 load in AX and call int $10 }
{ INT 10h handles screen directly }

{
FIRST VGA COLORS
Value Color
0 Black
1 Blue
2 Green
3 Cyan
4 Red
5 Magenta
6 Brown
7 Light Gray
8 Dark Gray
9 Light Blue
10 Light Green
11 Light Cyan
12 Light Red
13 Light Magenta
14 Yellow
15 White
}