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Q2 Computer - Hello Example

Small program to display "Hello!" on the LCD.

  lea   msg
  sta   ptr     ; ptr -> message to display
loop:
  lda   @ptr    ; Load the character
  jfc   $+2
  jmp   $       ; Loop forever when done
  sta   @neg1   ; Write to the LCD
  lea   =1      ; Move to the next character
  add   ptr
  sta   ptr
  jmp   loop

neg1:
  .dw -1
ptr:
  .dw 0
msg:
  .dw   0x138   ; Function set (8-bits, 2-lines, 5x8)
  .dw   0x10C   ; Display on, cursor off, blink off
  .dw   0x106   ; Entry mode, increment, no shift
  .dw   0x101   ; Clear screen
  .dw   "Hello!", 0