my program is correct?
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BITS 16
jmp start ;jump to actual executing code
;------------------------------message set to display on the screen--------------
wellcome_msg db 'welcome to Sagar cool new operating system',13,10,0,
reboot_msg db 'Your system is going to reboot now....',13,10,0,
reboot_key db 'Press any key to reboot',13,10,0,
resetmsg db 'Press any key to reset flopy',13,10,0,
reset_success db 'reset successful',13,10,0,
read_sectors db 'Press any key to read sector',13,10,0
read_success db 'Sector read successful....',13,10,0,
;------------------------------Main Boot loading process starts hear---------------
start:
mov ax, 07C0h ; Set data segment to where we're loaded
mov ds, ax ;
mov ax,9000h ;initlise the stack
mov ss,ax ;
mov sp,100h ;
mov si,wellcome_msg ;source index rigester (SI) ponits to the wellcome_message offset
call print ;call the print subrotine.
mov si,resetmsg
call print
call getkey
mov si,reset_success
call print
mov si,read_sectors
call print
call getkey
call read_sector
mov si,512;
call print
mov si,reboot_key ; SI points to the off set of the string with lable reboot_key
call print ;call the prit subrotine.
call getkey
mov si,reboot_msg ;SI points to offset of the string with lable reboot_msg
call print ;call the print subrotine.
call reboot ;reboots the system.
jmp $ ; jump hear ie., infinite loop
;------------------------sub rotine---------------------------------------------
;----------------------to print string ------------------------------------------
print: ;print subrotine
mov ah,0eh; ;loads ah with 0eh function for print char in BIOS int 10h
repet: ;
lodsb ;al<-----[si] and si=si+1
cmp al,0 ;compair al and 0
je done ;if al=0 then jump to lable don
int 10h; ;call BIOS intrupt 10h video services
jmp repet ;unconditional jump to lable repit:
done:
ret ;return to main program.
;-------------------------------------------------------------------------------------
;------------------------key board input------------------------------------------------
getkey:
mov ah,0 ;functaion for keyboard char input stors ASCII value in al
int 16h ;BIOS keyboard intrupt
ret
;-------------------------------------------------------------------------------------
;---------------------------reboot-----------------------------------------------------
reboot:
db 0EAh ; machine language to jump to FFFF:0000 (reboot)
dw 0000h
dw 0FFFFh
; no ret required; we're rebooting! (Hey, I just saved a byte :)
;--------------------------------------------------------------------------------------
;--------------------------reset flopy-------------------------------------------------
Reset_flopy:
.reset
mov dl,0;drive 0 is flopy drive
mov ah,0;reset flopy disk functation
int 13h; call BIOS
jc .reset
ret
;---------------------------------------------------------------------------------------
;---------------------------read sectors------------------------------------------------
read_sector:
mov ax,0x1000
mov es,ax
xor bx,bx
.read:
mov ah,0x02
mov al,1
mov ch,0
mov cl,2
mov dh,0
mov dl,1
int 0x13
jc .read
jmp 0x1000:0x0
ret
;---------------------------------------------------------------------------------------
times 510-($-$$) db 0 ; Pad remainder of boot sector with 0s
dw 0xAA55 ; The standard PC boot signature
jmp sec ;sector 2
newsector db 'Im the new sector',13,10,0,
sec:
mov si,newsector
mov ah,0eh; ;loads ah with 0eh function for print char in BIOS int 10h
re: ;
lodsb ;al<-----[si] and si=si+1
cmp al,0 ;compair al and 0
je did ;if al=0 then jump to lable don
int 10h; ;call BIOS intrupt 10h video services
jmp re ;unconditional jump to lable repit:
did:
