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Industry Standard Architecture Bus
When you plug your printer, keyboard or monitor into your PC, the
majority of the time you'll find, happily, that it simply works, no
matter what brand your peripherals are or how long ago you purchased
This is largely because of the developments of inventors Mark E. Dean
and Dennis L. Moeller, who developed the internal architecture of what's
know as the ISA (Industry Standard Architecture) systems bus at IBM in
the early 1980s.
Dean was born on March 2, 1957, in Jefferson City, Tenn. He earned a
B.S. in electrical engineering at the University of Tennessee in 1979,
followed by a master's degree in electrical engineering from Florida
Atlantic University in 1982. He later went on to earn a Ph.D. in
electrical engineering from Stanford University, in 1992. He began
working for IBM in 1980.
Moeller was born on April 28, 1950, in St. Louis, Mo. He received B.S.
and M.S. degrees in electrical engineering from the University of
Missouri. In 1974, he joined IBM's semiconductor manufacturing team, and
later moved onto IBM's Series 1 mini-computer printer project.
The pair began working together on a team tasked with building a
microcomputer system with bus connectivity for peripheral processing
devices for IBM computers and compatible PCs. A bus is a device that
connects a computer's central processing unit with devices such as
keyboards, mice, monitors, printers and the like. A bus allows the
devices to communicate with one another, making it possible for devices
to work together efficiently and at high speeds.
Dean and Moeller made architectural improvements within the PC and the
bus that laid the foundation for explosive growth in the computing
industry. Their invention, for which they received U.S. Patent No.
4,528,626 in 1985, made it possible for users to connect computers to
peripherals by simply plugging them in.
IBM first brought the concept to market in 1984 with its PC/AT computer.
An augmented version of the ISA bus remains standard within most PCs to
this day. Dean and Moeller were inducted into the National Inventors
Hall of Fame for their invention in 1997.
Dean continued at IBM and invented numerous other devices related to PC
systems, including the world's first one-gigahertz processor chip. He
also contributed to the design of IBM's first personal computer, holding
three of the nine core patents upon which these machines were based. He
holds some 25 patents with at least 10 more pending and has been honored
with numerous awards including election to the National Academy of
Engineers, membership in the American Academy of Arts and Science being
awarded with the Ronald H. Brown American Innovators Award.
In 1995, Dean became the first African American to ever be named an IBM
Fellow. He has held a variety of posts at IBM, including Vice President
of Performance for the RS/6000 division; Director of the Austin Research
Research Lab; and, as of 2004, Vice President of the IBM Almaden
Research Center in San Jose, Calif., where he has lead an effort to
develop tablet-style PCs, magazine-sized devices that would allow users
to read text on them much as they would on a newspaper page or in a
Moeller has stayed on with IBM as well, where he became a senior
technical staff member in the IBM Consumer Division. He holds 25 patents
related to PC system designs and PC printers.