Iwasaki Electronics Co., Ltd. (岩崎技研工業株式会社; Iwasaki Giken Kogyo Co., Ltd.; formerly Iwasaki Engineering Co., Ltd. in English) was a Kyoto-based company with an office in Tokyo. It was primarily known for making software development tools such as in-circuit emulators. Hiroji Iwasaki was the company president. 
Iwasaki was first contracted by Nintendo to reverse engineer Donkey Kong so that it could produce the sequel Donkey Kong Junior.  Nintendo did not have the source code as that was written by another company (Ikegami Tsushinki). Iwasaki would go on to program several of Nintendo's early Famicom/NES games. Several members of Iwasaki then started a new company in 1986 called Intelligent Systems, which also develops games and tools and has maintained a close relationship with Nintendo for its entire existence.
Research Methods: Hidden data, online resources
- Devil World (programming)
- Donkey Kong 3 (programming?)
- Duck Hunt (programming?)
- Hogan's Alley (programming?)
- Mario Bros. (programming?)
- Metroid (programming?)
- Robot Block / Stack-Up (programming?)
- Robot Gyro / Gyromite (programming?)
- Tennis (programming?)
- Wild Gunman (programming?)
- Wrecking Crew (programming?)
The Intelligent Systems website lists the following games.  According to a chart in Nintendo Online Magazine, "The development in the organization which still became the forerunner of the is these days."  Is Iwasaki "the forerunner?"