First written in 1976, Microsoft BASIC for the 8 bit MOS 6502 has been available for virtually every 6502-based computer including the Commodore series (PET, C64), the Apple II series, Atari 8 bit machines, and many more. Including the KIM-1.

On this blogMichael Steil discusses the family of Microsoft Basics for the 6502, timeline, quirks, version differences.

He also presents the source of version 1.x of the 6502 interpreter. With conditional assembly versions can be build from source into byte-exact versions of the following seven BASICs:

Commodore BASIC 1
OSI BASIC
AppleSoft I
KIM-1 BASIC
Commodore BASIC 2 (PET)
Intellivision Keyboard Component BASIC
MicroTAN BASIC

The KIM-1 version is based on the files on my retro website, so it is sure this works on the KIM-1 and the MicroKIM.
Feel free to discuss this on the forum on the retro website.

Hans, http://retro.hansotten.nl