rdos/boot/mbr.asm

	cpu 8086

%define seg 0x060

	org 0x7C00 - (seg << 4)

init:	cli
	mov ax, seg
	mov ds, ax
	mov es, ax
	mov ss, ax
	xor sp, sp
	mov ax, sp
	push ax

.retry:	mov ax, 0x0208
	mov cx, 2
	mov dh, 0
	mov bx, 0x100

	int 0x13
	jc .retry

	xor di, di
	mov ax, 0x18CD
	stosw
	int 0x12
	mov cl, 6
	shl ax, cl
	stosw
	mov al, 2
	stosb
	mov ax, 0x18CD
	stosw

	jmp seg:0x100

	times (0x1BE - ($-$$)) db 0

	; assumes 16 heads, 63 sectors per track
	; image of 1.44 MB floppy starting on 2nd track
part1:	db 0x80
	db 1, 1, 0
	db 1
	db 0xFF, 0xFF, 0xFF
	dd 63
	dd 0xb40

	times (0x1FE - ($-$$)) db 0

	; Boot signature
sig:	dw 0xAA55