1. When you press a switch in Port1, an LED in Port2 lights as long you press.

2. when you press a switch in Port1, an LED in Port2 comes on for 1 sec and goes off, even if you are holding the switch pressed.

3. 8 LEDs are connected to Port 2 via a buffer. And making a Port pin low, lights the LED. Onceyou have this then you can make the LEDS,
- Run one by one D0 to D7 or D7 to D0 or Alternate.
- All ON then All OFF
- Random light up patterns

4. Once you reach this level then try a LCD connected in 4 bit mode / 8 bit mode / blinking ON / Cursor ON / Off ....

5. Try talking to Hyper terminal or the equivalent of that in DOS via the serial port.

( Enough ? Maybe enough for a start)

If you want a simple assembler, try out the Pinnacle 52 available in the left of this page. It allows for 30 days free trial, then you buy it for a small amount.It is WIN based.

Raghu
-