GE-200 series

GE-200 series. The GE-200 series was a family of second-generation computers manufactured by General Electric beginning in 1960. It represented a significant commercial entry for the company into the mainframe computer market, competing with systems from IBM and RCA. The series is historically notable for its role in the development of time-sharing and the creation of the BASIC (programming language) at Dartmouth College.

Overview

Introduced as a successor to the earlier GE-100 series, the GE-200 series was designed for both scientific computing and commercial data processing. The architecture was influenced by work at MIT and the RAND Corporation, aiming to provide a versatile platform. Key to its strategy was support for the innovative Dartmouth Time-Sharing System, a project led by John G. Kemeny and Thomas E. Kurtz. This focus on multi-user accessibility distinguished it from many contemporaries and facilitated its use in academic and research institutions like Dartmouth College and the University of California, Berkeley.

Hardware

The hardware of the series utilized discrete transistor technology and magnetic-core memory, typical of the era. Central processors operated on a 36-bit word architecture, with models featuring memory capacities from 4K to 32K words. The I/O subsystem was advanced, supporting a wide array of peripheral equipment including magnetic tape drives, drum memory units, and early disk storage devices from IBM. A notable component was the Data Communications Processor, which managed communications for time-sharing terminals. The physical construction, involving large cabinets, was engineered at General Electric's facilities in Phoenix, Arizona.

Software

The software environment was pioneering, centered on the Dartmouth Time-Sharing System which allowed multiple users to run programs concurrently via teleprinter terminals. This system directly enabled the creation and dissemination of the BASIC (programming language) in 1964, designed by John G. Kemeny and Thomas E. Kurtz to be accessible. Other significant software included the GECOS operating system for batch processing, ALGOL 60 and FORTRAN compilers, and utilities for COBOL. The monitor and assembler tools were influential in the development of early operating system principles.

Models and variants

The series comprised several models, with the GE-225 and GE-235 being the most prominent and commercially successful. The GE-225, introduced in 1960, was the base model used at Dartmouth College for the original time-sharing experiments. The enhanced GE-235, with faster processing and greater memory, followed and saw wider adoption. Other variants included the GE-215, a smaller system, and the GE-255, designed for more intensive real-time computing applications. These systems were often configured with specialized peripherals from General Electric and other vendors like Digital Equipment Corporation.

Applications and legacy

The series found applications in university computing centers, scientific research laboratories, and for commercial data processing in industries such as insurance and banking. Its most enduring legacy is its foundational role in popularizing time-sharing and the BASIC (programming language), which influenced the personal computer revolution and programmers like Bill Gates. The commercial experience gained from the GE-200 series directly informed the development of its successors, the more powerful GE-400 series and the GE-600 series. While eventually displaced by IBM System/360 and third-generation computers using integrated circuits, the series remains a landmark in the history of interactive computing. Category:Computer-related introductions in 1960 Category:Mainframe computers Category:General Electric