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The Atmel AVR ® STK500 is a starter kit and development system for
Atmels AVR Flash microcontrollers. The STK500 gives designers a quick
start to develop code on the AVR combined with features for using the
starter kit to develop prototypes and test new designs. The STK500
interfaces with AVR Studio ® , Atmels Integrated Development
Environment (IDE) for code writing and debugging. <font color=red>NB!
Some may have noticed (!) that in later revisions of the STK500, the
AT45D021 2Mbit dataflash is no longer mounted! The reason is that,
allegedly, no adequate successor to the now obsoleted 45D021 could be
found. Anyway, the datasheet for it is included below, for those lucky
enough to have an early STk500.