stop printing for lack of stop mode

src/crab/gba/keypad.cr

@@ -15,7 +15,7 @@ module GBA
     end
 
     def []=(io_addr : Int, value : Byte) : Nil
-      puts "TODO: Implement stopping and keycnt behavior" if 0x132 <= io_addr <= 0x133
+      # TODO: If stopping is implemented, implement keycnt to exit stop mode
     end
 
     def handle_input(input : Input, pressed : Bool) : Nil

src/crab/gba/mmio.cr

@@ -40,7 +40,7 @@ module GBA
       when 0x204..0x205 then @waitcnt.write_byte(io_addr & 1, value)
       when 0x301
         if bit?(value, 7)
-          puts "TODO: Implement stopping behavior"
+          # TODO: See about supporting some kind of stopping
         else
           @gba.cpu.halted = true
         end