tanka_8086.S

.text
.code16gcc			// 16bit-realmode
.intel_syntax noprefix		// Intel Syntax

_start:
//Boot Parameter Block start
JMPInstruction:     jmp	short	entry
NoOperation:        nop
OEM_name:	.ascii  "tankaX86"
sect_size:	.word   512
culst_size:	.byte   1
rsvd_sects:	.word   1
fat_cont:	.byte   2
root_ents:	.word   224
total_sect:	.word   2880
media_type:	.byte   0xf0
fat_size:	.word   9
trk_size:	.word   18
head_cont:	.word   2
hidd_sect:	.long   0
huge_sect:	.long   0
boot_dev:       .byte   0
reserved:       .byte   0
signature:	.byte   0x29
vol_ID:		.long   0xffffffff
vol_label:	.ascii  "DISK       "
fat_name:	.ascii  "FAT12   "
//Boot Parameter Block end

entry:
	// code located at 0000:7C00,
	// CS=0 and IP=0x7c00.
	// Stack = 0x7bfe.
	xor	ax, ax		// 31 c0
	mov	ds, ax		// 8e d8
	nop			// 90
	// 5
	mov	ss,ax		// 8e d0
	mov	sp, 0x7bfe	// bc fe 7b
	mov	al,0x13		// b0 13
	// 7
	int	0x10		// cd 10
	xor	ebx,ebx		// 66 31 db
	//5
	mov	bl,0xa		// b3 0a
	shl	ebx,16		// 66 c1 e3 10
vwrite:
	inc	bx		// 43
	//7
	mov	al,bh		// 88 f8
	mov	[ebx],ax	// 67 89 03
	jmp	vwrite		// eb f8
	//7

//IPL 512bytes signature.
//8bytes alignments.
.align	8
	// boot signeture
	.org	510
	.byte	0x55,0xaa