KIM-1 (Keyboard Input Monitor) is a small 6502-based single board computer developped in 1976 and produced by MOS Technology, Inc. It was very successful in terms of that period, due to its low price (thanks to very inexpensive 6502 CPU) and easy-access expandability.

While the machine was originally intended to be used by engineers, it quickly found a large audience with hobbyists. A complete system could be constructed for under $500 with the purchase of the kit for only $245, and then adding a used terminal and a cassette tape drive.

Not long after the KIM's introduction, MOS Technology, Inc. was purchased by Commodore International and production of the original KIM lasted for a while under the CBM label, before it was ended.