Distributed Processing Programming Executive was an operating system introduced by IBM, pre-installed on selected computer models in the 80s.
Brief History
It was first introduced on the IBM 8100 model, which was released in 1978. It is also adopted as the operating system for its successor model, the IBM 8150 in 1983.
1987 saw the release of Distributed Processing Progamming Executive System Product Release 4, also known as DPPX/SP.
In 1986, IBM decided to cease the IBM 8100 architecture to consolidate its hardware and software families.
In 1988, they released DPPX/370 which ran on the ES/9370 processors (an S/370 model).
By the end of June 1997, DPPX/370 was officially retired.
Architecture
DPPX was written in PL/DS, an PL/I-derived systems programming language, similar to the PL/S systems programming language used for MVS and VM. Part of the DPPX/370 development process was developing a PL/DS 2 language, which was based on PL/DS, but with changes necessitated by the changed instruction set. (PL/DS, like PL/S, is a high-level language which encourages significant use of inline assembly.)
External links
Feasibility and Overview of DPPX (http://www.findarticles.com/p/articles/mi_m0ISJ/is_n1_v29/ai_8276666)
DPPX and DPP10 drastically increased the rate of recovery from inactivation of Kv4.2-mediated currents compared with Kv4.2 alone.
DPPX increased the inactivation rates for Kv4-mediated current less than would be expected from its effect on recovery from inactivation and time to peak.
The gel was transferred to a nitrocellulose membrane and probed sequentially with antibodies (Ab) to Kv4.2 (A), DPPX (B), and DPP10 (C) proteins.
By the end of June 1997, DPPX/370 was officially retired.
DPPX was written in PL/DS, an PL/I-derived systems programming language, similar to the PL/S systems programming language used for MVS and VM.
Part of the DPPX/370 development process was developing a PL/DS 2 language, which was based on PL/DS, but with changes necessitated by the changed instruction set.
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