FASM.
boot.ASM:

org 0x7C00

start:
        cli
        xor ax,ax
        mov ds,ax
        mov es,ax
        mov ss,ax
        mov sp,0x7C00
        sti
        mov ax,2
        int 0x10
        mov dx,0
        call set_cursor_pos
        mov bp,msg
        mov cx,10
        call print_mes
        add dh,1
        call set_cursor_pos
        mov bp,con
        mov cx,14
        call print_mes
cont:
        mov ah,0x10
        int 0x16
        cmp al,0xD
        jz kernel
        jmp cont
kernel:

        mov ax,0
        mov es,ax
        mov bx,0x7E00 ;dl'a chego????????!!?!       mozhno zhe shto ugodno postavit'
        mov ch,0
        mov cl,2
        mov dh,0
        mov dl,0x80
        mov al,2
        mov ah,2
        int 0x13
        jmp 0x7E00
print_mes:
        mov bl,3
        mov ax,0x1301
        int 0x10
        ret
set_cursor_pos:
        mov ah,2
        xor bh,bh
        int 0x10
        ret

;-------------------------------------------------

msg db 'loading...',0
con db 'press Enter...',0
finish: times 0x1FE-finish+start db 0
db 0x55,0xAA

grf.ASM:

org 0x7E00

start:
        mov ax,0x13
        int 0x10
        mov ax,0xA000
        mov es,ax

        mov di,9649
        mov ax,18150
        push di
        push ax
        dec di
        mov byte[es:di],47
        sub di,320
        mov byte[es:di],47
        inc di
        mov byte[es:di],47
        mov di,ax
        inc di
        mov byte[es:di],40
        add di,320
        mov byte[es:di],40
        dec di
        mov byte[es:di],40
        pop ax
        pop di
        call ris_lin
vs:
        jmp vs

;-------------------------------------------------

ris_lin:
        mov si,320
        push ax
        div si
        mov bx,ax
        push bx
        mov bx,dx
        push dx
        pop ax
        xchg ax,di
        push ax
        div si
        mov cx,ax
        pop ax
        xchg ax,di

        mov bx,dx
        pop dx
        sub dx,bx
        mov [shirina],dx
        pop bx
        sub bx,cx
        mov [visota],bx

        xor dx,dx
        push ax
        mov ax,[shirina]
        mov bx,[visota]
        div bx
        mov cx,ax
        pop ax
        xor bx,bx
rl_loop1:
        push cx
rl_loop2:
        mov byte[es:di],15
        inc di
        loop rl_loop2
        add di,320
        inc bx
        pop cx
        cmp di,ax
        jg rl_end
        cmp bx,dx
        jz rl_dob
rl_con:
        jmp rl_loop1
rl_dob:
        xor bx,bx
        inc di
        mov byte[es:di],15
        jmp rl_con
rl_end:
        ret








;-------------------------------------------------

visota rw 1
shirina rw 1

sbor.ASM:

macro align value { db value-1 - ($ + value-1) mod (value) dup 0 }
HEADS = 1
SPT = 2
Begin:
        file "boot.bin",512
        file "grf.bin"
        align 512