The object
Dean co-invented the IBM PC's bus-control technology with Dennis Moeller, enabling peripheral devices to communicate with the microcomputer. That hardware interface let the PC be expanded with practical add-in cards and became a major building block of the open personal-computer ecosystem.
01
What Mark did
Co-invented the IBM PC bus-control system that enabled peripheral processing and expansion cards.
02
Why it matters
NIHF credits Dean and Moeller's ISA work with changing computers through a standardized peripheral architecture.
03
Living-status check
The University of Tennessee's 2026 engineering profile identifies Dean as professor emeritus and an adviser.