This is a design of a very simple and easy to build development board for Atmel 90S8515 microcontroler. All necessary parts are on-board, including a serial interface connected to the controllers UART. All I/O-Pins are accessible through edge connectors. The controller can be programmed incircuit with a very simple parallel port cable.
The programming and UART lines are disconnectable through jumpers. In this way every pin is useable.
a picture of a complete board:
Everything that you need to build a board yourself: avr3-2.tbz