Minimum assembly bootloader

	BITS 16
    ; Load a program off the disk and jump to it

    ; Tell the compiler that this is offset 0.
    ; It isn't offset 0, but it will be after the jump.
;to run
;nasm floppyboatloader.asm -o floppyboatloader.bin
;dd status=noxfer conv=notrunc if=floppyboatloader.bin of=floppyboatloader.flp
;qemu-system-i386 -fda floppyboatloader.flp
[ORG 0]

            jmp start     ; Goto segment 07C0

    start:
            ; Update the segment registers

            mov ax, cs
            mov ds, ax
            mov es, ax

    reset:                      ; Reset the floppy drive
            mov ax, 0           ;
            mov dl, 0           ; Drive=0 (=A)
            int 13h             ;

            jc reset            ; ERROR => reset again

    read:
            mov ax, 1000h       ; ES:BX = 1000h:0000
            mov es, ax          ;
            mov bx, 0h           ;

            mov ah, 2           ; Load disk data to ES:BX
            mov al, 5           ; Load 5 sectors
            mov ch, 0           ; Cylinder=0
            mov cl, 9           ; Sector=2
            mov dh, 0           ; Head=0
            mov dl, 0           ; Drive=0
            int 13h             ; Read!

            jc read             ; ERROR => Try again

            jmp 1000h:0h      ; Jump to the program

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

            mov ah, 0Eh
            mov al, '='
            int 10h

            mov ah, 0Eh
            mov al, '1'
            int 10h

            mov ah, 0Eh
            mov al, '2'
            int 10h

            mov ah, 0Eh
            mov al, '3'
            int 10h

            mov ah, 0Eh
            mov al, '4'
            int 10h

            jmp $