`org 0x7C00
bits 16

%define ENDL 0x0D, 0x0A

jmp short start
nop
bdn_oem: db “MSWIN4.1”
bdb_bytes_per_sector: dw 512
bdb_sectors_per_cluster: db 1
bdb_reserved_sectors: dw 1
bdb_fat_count: dw 0E0h
bdb_toral_sectors: dw 2880
bdb_media_descriptor_type: db 0F0h
bdb_sectors_per_fat: dw 9
bdb_sectors_per_track: dw 18
bdb_heads:
bdb_hidden_sectors: dd 0
bdb_large_sector_count: dd 0
ebr_drive_number: db 0
db 0
ebr_drive_number: db 0
db 0
ebr_signature: db 29h
ebr_volume_id: db 12h, 34h, 56h, 78h
ebr_volume_label: db ‘MudOS 1.0’
ebr_system_id: db ‘FAT12 ‘

start:
jmp main

puts:
push si
push ax

.loop:
lodsb
or al, al
jz .done
mov bh, 0
int 0x10

jmp .loop

.done:
pop ax
pop si
ret

main:
mov ax, 0
mov ds, ax
mov es, ax
mov ss, ax
mov sp, 0x7C00
mov [ebr_drive_number], dl

mov ax, 1
mov cl, 1
mov bx, 0x7E00
call disk_read

mov si, msg_bootstring
call puts
hlt

floppy_error:
mov si, msg_read_failed
call puts
jmp wait_key_and_reboot

wait_key_and_reboot:
mov ah, 0
int 16h
jmp 0FFFFh:0
.halt:
cli
hlt

lba_to_chs:
push ax
push dx

xor dx, dx
div word [bdb_sectors_per_track]
inc dx
mov cx, dx
xor dx, dx
div word [bdb_heads]

mov dh, dl
mov ch, al
shl ah, 6
or cl, ah

pop ax
mov dl, al
pop ax
ret

disk_read:
push ax
push bx
push cx
push dx
push di

call lba_to_chs
pop ax
mov ah, 02h
mov di, 3

_retry:
pusha
int 13h
stc
int 13h
jnc .done
popa
call disk_reset
dec dl
test di, di
jnz .retry

.fail:
jmp floppy_error

.done:
popa

push di
push dx
push cx
push bx
push ax
ret

disk_reset:
pusha
mov ah, 0
stc
int 13h
jc floppy_error
popa
ret

msg_bootstring: db “MudOS 1.0 Beta Development Preview”, ENDL, 0
msg_bootstring1: db “Starting”, ENDL, 0
msg_read_failed: db “Floppy read failed”, ENDL, 0

times 510-($-$$) db 0
dw 0AA55h`

i keep getting this stupid error