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[org 0x7c00]
[bits 16]
jmp boot_16 ;start boot process
STR_VERSION:
db "FoolOs~",0
;print_string routine ([bx])
;this routine will print a null terminated string at [bx] to the screen.
print_string:
pusha ;push all registers
mov ah,0x0e
print_string_loop:
;check if value at [bx] is "\0" (end of string)
mov cl,[bx]
cmp cl,0
je print_string_finish
;otherwise instruct BIOS to print the current char
mov al,cl
int 0x10
;proceed with next char
inc bx
jmp print_string_loop
print_string_finish:
popa ;pop all registers
ret ;return to caller
boot_16:
mov bx, STR_VERSION
call print_string
jmp boot_16
times 510-($-$$) db 0
dw 0xaa55
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