video.asm

jserv写的orz小内核 有详细的注释

;-----------------------------------------------------------------------------------
;;;; IN: AL = {0, text 80x25} {1, 320x200x256}

SetVideoMode:
	and al, al
	jnz SetVideoMode0

	mov [rmode_ax], WORD 0x03
	mov al, 0x10
	jmp RmodeInt

SetVideoMode0:
	dec al
	jnz SetVideoMode1

	mov [rmode_ax], WORD 0x13
	mov al, 0x10
	jmp RmodeInt

SetVideoMode1:
	ret