The IBM PC/AT, introduced in 1984, was a significant advancement in personal computing. It featured the Intel 80286 processor, which allowed for improved performance and multitasking capabilities compared to its predecessor, the IBM PC. The system supported up to 16 megabytes of RAM and utilized the MS-DOS operating system, making it popular for business and personal use. The PC/AT also introduced the AT bus, which allowed for more expansion slots and better connectivity with peripherals. Its architecture set the standard for future personal computers, leading to the widespread adoption of the IBM-compatible PC format in the industry.