The KIM I was created by MOS Technology, Inc. as a single board computer to help developers get to know their new 6502 microprocessor. This little computer also became popular with hobbyists of the era for its low price ($295) and the fact that it was already assembled and ready to run.
The KIM I in its base configuration contained 1k of RAM, 2k of ROM which held its simple monitor program and 2 IO/Timer chips. The main board contained memory decoding for adding up to 5k of memory. Expansion up to the full 64k of the 6502 was possible using external decoding.
Download the KIM I simulator
Note: This program requires .net 4.0 framework to be installed