* * * MOVE BYTES TO PORT A WITH MOVE INSTRUCTION * * RAMStart EQU $0040 RomStart EQU $E000 ResetVector EQU $FFFE PORTA EQU $00 ; Address of Port A DDRA EQU $04 ; Address of Data Direction Register for Port A ORG ResetVector FDB MAIN ORG RAMStart BEGIN FCB 'Hello World' END FCB $00 ORG RomStart MAIN LDA #$FF ; Load A to $FF STA DDRA ; Set Port A for output LDHX #BEGIN ; Point to string in memory LOOP MOV X+,PORTA ; Move data from memory CPHX #END ; has pointer reeached END (value 00) BLS LOOP ; Branch if lower or same NOP