News: Notch's Hello World Example (including DAT usage)

Notch's Hello World Example (including DAT usage)

; Assembler test for DCPU
; by Markus Persson
             set a, 0xbeef                        ; Assign 0xbeef to register a
             set [0x1000], a                      ; Assign memory at 0x1000 to value of register a
             ifn a, [0x1000]                      ; Compare value of register a to memory at 0x1000 ..  
                           set PC, end                      ; .. and jump to end if they don't match

             set i, 0                             ; Init loop counter, for clarity
:nextchar    ife [data+i], 0                      ; If the character is 0 ..
                 set PC, end                      ; .. jump to the end
             set [0x8000+i], [data+i]             ; Video ram starts at 0x8000, copy char there
             add i, 1                             ; Increase loop counter
             set PC, nextchar                     ; Loop  

:data        dat "Hello world!", 0                ; Zero terminated string

:end         sub PC, 1                            ; Freeze the CPU forever

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