Tim Paterson

Tim Paterson is an American software engineer best known for creating the original 86-DOS operating system, which later became MS-DOS after its acquisition by Microsoft. His work in the early 1980s provided the foundational kernel and command-line interface for the IBM Personal Computer and its compatibles, profoundly influencing the personal computer industry. Paterson's career spans roles at Seattle Computer Products, Microsoft, and several other technology firms, where he contributed to compiler design, software development tools, and storage technology.

Early life and education

Born in Seattle, Paterson developed an early interest in electronics and computing. He attended the University of Washington, where he earned a Bachelor of Science degree in Computer Science in 1978. During his studies, he gained practical experience with minicomputer systems and assembly language programming, which prepared him for work in the burgeoning microcomputer industry. His academic projects involved early CP/M-based systems and Intel 8080 processors, foreshadowing his later professional focus.

Career at Seattle Computer Products

After graduation, Paterson joined Seattle Computer Products (SCP), a local hardware vendor specializing in S-100 bus systems and Intel 8086 microprocessor boards. At SCP, he worked on firmware and BIOS development for the company's 16-bit computer kits. The lack of a commercially available operating system for the Intel 8086 prompted the company to develop its own software solution. Paterson's deep understanding of CP/M architecture and the 8086 instruction set positioned him to lead this critical project.

Development of 86-DOS

In 1980, tasked with creating an operating system for SCP's new 8086-based hardware, Paterson developed 86-DOS, initially called QDOS (Quick and Dirty Operating System). He modeled its API and file system closely on Digital Research's CP/M to ensure compatibility with existing application software like WordStar and dBase II. The system was written in assembly language and featured a command-line interpreter named COMMAND.COM. Within months, Microsoft, seeking an OS for the upcoming IBM PC, licensed and later purchased the rights to 86-DOS from SCP. Microsoft heavily modified the code, rebranding it as MS-DOS, which became the standard OS for the IBM Personal Computer launched in 1981.

Later career and legacy

Following the sale of 86-DOS, Paterson briefly worked at Microsoft in 1981, contributing to early versions of MS-DOS and the BASIC interpreter. He later co-founded Falcon Technology, which was acquired by Adaptec, where he worked on SCSI host adapters and storage software. He also held engineering roles at Conner Peripherals, Samsung, and Data General, focusing on device drivers and embedded systems. Paterson's creation is widely regarded as a pivotal element in the success of the IBM PC compatible platform, enabling the dominance of Microsoft and Intel in the Wintel alliance. He has been recognized by institutions like the Computer History Museum for his contributions to computing history.

Personal life

Paterson maintains a relatively private life in the Pacific Northwest. An avid musician, he plays guitar and has been involved in local music communities. He has occasionally participated in industry retrospectives and interviews, discussing the early days of personal computing at events hosted by organizations such as the University of Washington and the Seattle Computer Museum. He continues to engage with technology as a consultant and hobbyist, exploring areas like digital audio workstations and home automation.

Category:American computer programmers Category:American software engineers Category:People from Seattle Category:University of Washington alumni Category:MS-DOS