I assembled a small board containing a Atmega8515 microcontroller. I used a 18.432MHz crystal for clock generation. I discovered that the circuit is very sensitive in terms of routing the ground in a correct way and keeping the crystal connections as short as possible. Now it seems to work more or less stable. The board you can see is similar to the Atmega boards a german company sells as kit. But since these boards do not support the Mega8515 and i want to use its external memory bus feature i had to create a new one…

Mega8515 in action making some LED´s blink ;)