Burroughs' first internally developed machine, the B5000, was designed in 1961 and Burroughs sought to address its late entry in the market with the strategy of a completely different design based on the most advanced computing ideas available at the time.
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Burroughs B5000 was unusual at the time in that the architecture and instruction set were designed with the needs of software taken into consideration.
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Powerful Burroughs B5000 COBOL compiler was a one-pass compiler and equally fast.
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ALGOL used on the Burroughs B5000 is an extended ALGOL subset.
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Originally, the Burroughs B5000 MCP operating system was written in an extension of extended ALGOL called ESPOL.
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The Burroughs B5000 was designed as a stack machine – all program data except for arrays was kept on the stack.
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Burroughs B5000 became known for its superior compilers and implementation of languages, including the object-oriented Simula, and Iverson, the designer of APL declared that the Burroughs B5000 implementation of APL was the best he'd seen.
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Burroughs B5000 line were pioneers in having multiple processors connected together on a high-speed bus.
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Direct influence of the Burroughs B5000 can be seen in the current Unisys ClearPath range of mainframes which are the direct descendants of the Burroughs B5000 and still have the MCP operating system after 40 years of consistent development.
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Burroughs B5000 machines were programmed exclusively in high-level languages; there is no assembler.
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