Pastel (programming language)

Pastel is an extended version of the Pascal programming language, created in c. 1982 for Amber, an operating system for the S-1 supercomputer project at Lawrence Livermore National Laboratory in California .[1] The Pastel compiler was the inspiration for Richard Stallman's GNU C compiler.[2] Pastel was conceived by Jeffrey M. Broughton, then Project Engineer in charge of compilers and operating system software for the S-1 project,[3] because of dissatisfaction with the PL/1 language in which Amber was being implemented. The language was named Pastel ("an off-color Pascal").

Compared with Pascal compilers of that period, Pastel's features included:[4]

* Improved type definition
* Parametric types
* Explicit packing and allocation control
* Additional parameter passing modes
* Additional control constructs
* Set iteration
* Loop-exit form
* Return statement
* Module definition
* Exception handling
* General enhancements
* Conditional boolean operations
* Constant expressions
* Variable initialization

## References

1. ↑ Mark Smotherman. "S-1 Supercomputer (1975-1988)". Archived from the original on 2014-02-01. https://www.webcitation.org/6N4WnuuZk.
2. ↑ Frankston, Charles (1984). "6 Implementation". The Amber Operating System (Thesis). MIT. Retrieved 2014-02-01.
3. ↑ Mark Smotherman (June 28, 2005). "S-1 Supercomputer Alumni". Archived from the original on 2014-02-01. https://www.webcitation.org/6N4Y48F2c.
4. ↑ Jeff Broughton. "THE S-l PROJECT: Advancing the Digital Computing Technology Base for National Security Applications". https://archive.org/stream/bitsavers_llnls1S1Op_10037358/S1_OpenHouse_Apr85_djvu.txt. Retrieved 2014-02-01. Chapter: S-l Software Development: Programming Languages Supported

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