Day 12

Setting Up Graphics

	Today, we will setup graphics and draw a pixel!

BIOS Screen Services
	INT 10h is the BIOS Screen or Video Services. 

Setting the Graphics mode
	Will will use mode 13h, it is a paletted 320x240 sized 256 color mode.

Here's the code to set it up:
		mov al,13h  ; the mode
		mov ah,0   ; function number 0
		int 10h    ; call BIOS Screen Service

Drawing a Pixel
	BIOS Screen Service Function Number 0ch is draw a pixel, it expects the
color number in AL, X in CX,and Y in DX.

	The code: (Red pixel at 50,100):
		mov ah,0ch
		mov al,4  ; 4 is red with default palette
		mov cx,50  ; x = 50
		mov dx,100 ; y = 100
		int 10h    ; call BIOS Service

This Day In Review

	Simple, isn't it! With what you currently know, you can write a program to display
all 256 colors.

	Have fun!,
		- GbaGuy


Intro - Day 13