About: Westi

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Westi (Westinghouse Teleprocessing Interface System) was one of two early local teleprocessing packages for IBM's DOS/VSE environment. Westi stood for Westinghouse Terminal Interactive. Westi provided an interface and access method for programmers to 'talk' to monitors and handle data entry. Such access methods later became known as APIs and the handlers a form of transaction processing. In 1981, WESTI was considered the main competitor to CICS, holding second place in market share for IBM mainframe transaction processing monitors.

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  • Westi (Westinghouse Teleprocessing Interface System) was one of two early local teleprocessing packages for IBM's DOS/VSE environment. Westi stood for Westinghouse Terminal Interactive. Westi provided an interface and access method for programmers to 'talk' to monitors and handle data entry. Such access methods later became known as APIs and the handlers a form of transaction processing. In 1981, WESTI was considered the main competitor to CICS, holding second place in market share for IBM mainframe transaction processing monitors. Initially written for the IBM 2260 running under DOS on IBM mainframes, the original product was offered free for IBM users. With the advent of DOS/VS and the IBM 3270 series terminals, Westinghouse realized they could recover part of their development costs and commercialized the product, circa 1970. The company added transparent remote access about 1980. Westi consumed less memory than CICS, which was attractive in the highly memory-constrained computing environments of the 1970s, in which 256KB was considered a large amount of memory. Westi operated as an application's mainline program and, like IBM's soon to follow CICS, programmers wrote subroutines to read and write data to and from terminals and discs. This real time paradigm became known as transaction processing. This differed from Westi's primary competitor, DUCS, which reversed that model in that it was a subroutine package that read from and wrote to monitors. While Westi was not as easy to program and use as DUCS, Westi (like CICS) handled task management. In terms of speed, Westi fell between DUCS and the considerably more process-bound CICS. (en)
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  • Westi (Westinghouse Teleprocessing Interface System) was one of two early local teleprocessing packages for IBM's DOS/VSE environment. Westi stood for Westinghouse Terminal Interactive. Westi provided an interface and access method for programmers to 'talk' to monitors and handle data entry. Such access methods later became known as APIs and the handlers a form of transaction processing. In 1981, WESTI was considered the main competitor to CICS, holding second place in market share for IBM mainframe transaction processing monitors. (en)
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  • Westi (en)
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