Hello World !!!

The Hello World in assembly language.

This file must be named 1.asm and be saved to the Scripts/Asm_1 subdirectory in the universe directory.

To see the result, you must open the display panel :  click on the "hardware" button in order to open it. 

Listing #1 : Hello World

; HELLO WORLD
; *******************************************
; *                                         *
; *              Hello World                *
; *                                         *
; *******************************************

; Definitions for the Video Circuit registers

VIDEO_MODE    = 0x80000100 
VIDEO_ADDRESS = 0x80000104
VIDEO_CONTROL = 0x80000108

      .org 0
   
; Init the video chip
 
      move.l #VIDEO_ADDRESS,r0 ; Address of the chip register for video pointer.
      move.l #VideoMemory,r1   ; Address of the video memory.
      move.l r1,(r0)           ; Put the video memory address to the video pointer register of the video chip.
 
      move.l #VIDEO_MODE,r0    ; Address of the chip register for video mode.
      movex.n #1,r1            ; Value for the text mode 1 (40x30).
      move.l r1,(r0)           ; Put the video mode value in the register for video mode

; Copy the text to display into the screen memory

      move.l #TextToDisplay,r0 ; Address of the text string to display.
      move.l #VideoMemory,r1   ; Address of the video memory.
  
Loop: move.b (r0),r2           ; Get source data
      beq End                  ; If data is zero, terminate the loop
      inclr                    ; increment source pointer
      move.b r2,(r1)           ; Put data to destination
      inclr                    ; increment destination pointer
      bra Loop                 ; Continue loop
      
End:  sleep                    ; Do nothing and relinquish the allowed quantum of time.
      bra End                  ; Loop forever


TextToDisplay: .data.b ("HELLO WORLD",0)

VideoMemory: .reserve.b 1200 ; 40x30 display = 1200 bytes