D-111

v-2.0
---
1. PORTA => LED on/off
        --> using "pull-up resistor"

   ==>     RESULT
        no resistor
            => still, LED is blinking
D-111

v-2.1-1
---
1. RB1 --> ON
   	 --> while RA4 is High
2. attach button to RA4

	==> going
	1. RA4 gets on
	2. display => rectangle chars appear
	3. not working, in short