💾 Archived View for thrig.me › blog › 2023 › 11 › 12 › bootloader.asm captured on 2024-05-10 at 12:14:27.

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; bootloader - setup system and get to the kernel. assemble with nasm

BITS 16
org 0x7c00
	jmp start
times 0x3e -( $ - $ ) db 0	; FAT headers stops at 3e
start:
	mov ax, 0
	mov ds, ax
	mov es, ax
	mov ss, ax
	mov sp, 0		; setup hardware stack
	mov ah, 0x02		; fn: Read Sectors From Drive
	mov al, 2		; sector count
	mov ch, 0		; cylinder
	mov cl, 2		; sector
	mov dh, 0		; head
	mov bx, 0x500		; destination addess
	int 0x13
 	mov ax, 0x0003		; video mode 80x25
	int 0x10
	jmp 0:0x500
times 510 -( $ - $ ) db 0
db 0x55, 0xaa