JE DAN JMP

ORG    100h

LEA    SI, msg        ; load address of msg to SI.

CALL   print_me

RET                   ; return to operating system.

; ==========================================================
; this procedure prints a string, the string should be null
; terminated (have zero in the end),
; the string address should be in SI register:
print_me     PROC

next_char:
    CMP  b.[SI], 0    ; check for zero to stop
    JE   stop         ;

    MOV  AL, [SI]     ; next get ASCII char.

    MOV  AH, 0Eh      ; teletype function number.
    INT  10h          ; using interrupt to print a char in AL.

    ADD  SI, 1        ; advance index of string array.

    JMP  next_char    ; go back, and type another char.

stop:
RET                   ; return to caller.
print_me     ENDP
; ==========================================================

msg    DB  'Hello World!', 0   ; null terminated string.

END