The IBM System/3, introduced in 1969, was a midrange computing system designed to serve small and medium-sized businesses. It marked a significant step in making computers accessible to organizations that found the larger IBM System/360 too complex or expensive. The System/3 was engineered with cost-effectiveness and ease of use in mind, offering streamlined hardware and software that could handle typical business tasks such as payroll, inventory management, and accounting. It was particularly notable for introducing the Report Program Generator II (RPG II), a simplified programming language tailored for business users with limited programming experience. RPG II became immensely popular, establishing itself as a cornerstone for business application development on IBM systems.

hardware

The hardware of the System/3 was based on IBM's Monolithic System Technology (MST), which combined discrete transistors and early integrated circuits to create a reliable and compact processor. This 8-bit processing unit, though less powerful than the System/360, was more than sufficient for the System/3's targeted applications. The system supported a variety of peripherals, including printers, disk storage, and the innovative IBM 96-column punch card, a high-density replacement for the older 80-column cards. This punch card played a critical role in the System/3's data entry and processing workflows, reflecting IBM's focus on efficient business operations.

Design

The System/3's design was modular, allowing businesses to expand their computing capabilities as needed. It came in several configurations, making it flexible enough to meet the diverse needs of its user base. Despite its simplicity, the System/3 was a reliable and powerful tool for its time, helping to democratize computing in the business world. Its success laid the groundwork for subsequent IBM midrange systems, such as the System/34 and System/38, and its legacy can still be felt in modern IBM systems like the AS/400 and IBM i.