String duplication

;—————————————————————–

; String handling in assembly

;     c) String duplication

;—————————————————————–

        ORG 0000h

        JP   0100h       ;(link to the Hardware RESET)

        ORG 0100h

START :       ld sp,0fff0h ; stack pointer initialization

             ld A,00h

           CALL subprog

             ld (8000h),hl

            ld (8002h),de

            ld (8004h),A

             ld hl,8000h

            ld de,9000h

            CALL subprog2

               HALT           

;This subprogram will define the string>

subprog : ld h,55h ; this subprogram will write the string “LUCA\0″

         ld l,4ch

         ld d,41h

         ld e,43h

          RET

;This subprogram will copy the string>

subprog2 : ld a,00h

          add A,(hl)

          jp z, exit

          ld A,(hl)

          ld (de), a

          inc hl

          inc de

          jp subprog2

   exit :ld a,00h

        ld (de), A

         ret