![]() "Burroughs Large Systems" referred to all of these large-system product lines together, in contrast to the COBOL-optimized Medium Systems (B2000, B3000, and B4000) or the flexible-architecture Small Systems (B1000).įounded in the 1880s, Burroughs was the oldest continuously operating company in computing ( Elliott Brothers was founded before Burroughs, but did not make computing devices in the 19th century). Each division's product line grew from a different concept for how to optimize a computer's instruction set for particular programming languages. In the 1970s, the Burroughs Corporation was organized into three divisions with very different product line architectures for high-end, mid-range, and entry-level business computer systems. Subsequent major redesigns include the B6500/B6700 line and its successors, as well as the separate B8500 line. The B5000 evolved into the B5500 (disk rather than drum) and the B5700 (up to four systems running as a cluster). The first machine in the family was the B5000 in 1961, which was optimized for compiling ALGOL 60 programs extremely well, using single-pass compilers. The Burroughs Large Systems Group produced a family of large 48-bit mainframes using stack machine instruction sets with dense syllables. ![]() Range of mainframe computers in the 1960s and 70s
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