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UCSD Pascal was a Pascal programming language system that ran on the UCSD p-System, a portable, highly machine-independent operating system.
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UCSD and Pascal
Java came to be used for server-side programming, and bytecode virtual machines became popular again in commercial settings with their promise of " Write once, run anywhere " ( UCSD Pascal had been popular for a time in the early 1980s ).
UCSD Pascal branched off Pascal-P2, where Kenneth Bowles utilized it to create the interpretive UCSD p-System.
In the early 1980s, UCSD Pascal was ported to the Apple II and Apple III computers to provide a structured alternative to the BASIC interpreters that came with the machines.
* Softech Microsystems UCSD System with UCSD Pascal
This term is applied both generically to all such machines ( such as the Java Virtual Machine and MATLAB precompiled code ), and to specific implementations, the most famous being the p-Machine of the Pascal-P system, particularly the UCSD Pascal implementation.
The UCSD p-System, developed at The University of California, San Diego, was a self-compiling and self-hosted operating system based on p-code optimized for generation by the Pascal programming language.
UCSD Pascal was first released in 1978.
UCSD Pascal was developed at The University of California, San Diego Institute for Information Systems in 1978 to provide students with a common operating system that could run on any of the then available microcomputers as well as campus DEC PDP-11 minicomputers.
UCSD Pascal was based on a p-code machine architecture.
The UCSD Pascal p-Machine was optimized for the new small microcomputers with addressing restricted to 16-bit ( only 64KB of memory ).
James Gosling cites UCSD Pascal as a key influence ( along with the Smalltalk virtual machine ) on the design of the Java virtual machine.
The UCSD p-code was optimized for execution of the Pascal programming language.
The UCSD Pascal compiler was distributed as part of a portable operating system, the p-System.
He based UCSD Pascal on the Pascal-P2 release of the portable compiler from Zurich.
UCSD introduced two features that were important improvements on the original Pascal: variable length strings, and " units " of independently compiled code ( an idea included into the then-evolving Ada programming language ).
Niklaus Wirth credits the p-System, and UCSD Pascal in particular, with popularizing Pascal.
The Pascal dialect of UCSD Pascal came from the subset of Pascal implemented in Pascal-P2, which was not designed to be a full implementation of the language, but rather " the minimum subset that would self-compile ", to fit its function as a bootstrap kit for Pascal compilers.
UCSD and was
Crick died of colon cancer on 28 July 2004 at the University of California San Diego ( UCSD ) Thornton Hospital in La Jolla ; he was cremated and his ashes were scattered into the Pacific Ocean.
Robinson gave the novella in rough form to Ursula K. Le Guin to read and edit while he was enrolled in her writing workshop at UCSD in the spring of 1977.
When the original IBM-PC was created in 1980, there were three leading competing operating systems: PC-DOS, CP / M-86, and UCSD p-System, while Xenix was added in 1983-1984.
The San Diego campus was founded as a marine station in 1912 and became UCSD in 1959.
It was developed at the University of California, San Diego ( UCSD ).
UCSD p-System ( Version IV, supplied by SofTech ) was one of three operating systems ( along with PC-DOS and CP / M-86 ) that IBM offered for its original IBM PC ; but the p-System never sold very well for the IBM PC, mainly because of a lack of applications and because it was more expensive than the other choices.
Urs Ammann, a student of Niklaus Wirth, originally presented a p-code in his PhD thesis, from which the UCSD implementation was derived, the Zurich Pascal-P implementation.
The speed of these COM executable files was a revelation for developers whose only prior experience programming microcomputers was with interpreted BASIC or UCSD Pascal, which compiled to p-code.
Somewhat in the fashion of UCSD Pascal it was implemented via ' compilation ' into an intermediate representation.
It was also the basis for programming classes taught by Jef and Jon in the UCSD Visual Arts Dept.
He later hired his former student Bill Atkinson from UCSD to work at Apple, along with Andy Hertzfeld and Burrell Smith from the Apple Service Department, which was located in the same building as the Publications Department.
UCSD and programming
UCSD p-System began around 1974 as the idea of UCSD's Kenneth Bowles, who believed that the number of new computing platforms coming out at the time would make it difficult for new programming languages to gain acceptance.
* p-code of UCSD Pascal implementation of the Pascal programming language
When Steve Wozniak developed the first disk drives for the Apple II, Raskin went back to his contacts at UCSD and encouraged them to port the UCSD P-System operating system ( incorporating a version of the Pascal programming language ) to it, which Apple later licensed and shipped as Apple Pascal.
The UCSD p-System supported a complete student programming environment on early 8-bit microprocessors with poor instruction sets and little RAM, by compiling to a virtual stack machine rather than to the actual hardware.
The first version of Quicken was coded in Microsoft's BASIC programming language for the IBM PC and UCSD Pascal for the Apple II by Tom Proulx and had to contend with a dozen serious competitors.
Also available for programming the HP 9800 series was a bootable development environment based on UCSD Pascal, but with a compiler which would generate fast, native Motorola 68000 object code, instead of the slower p-code typical of most UCSD Pascal implementations.
UCSD and language
Some intrinsics were provided to accelerate string processing ( e. g. scanning in an array for a particular search pattern ); other language extensions were provided to allow the UCSD p-System to be self-compiling and self-hosted.
Although UCSD Pascal later obtained many of the other features of the full Pascal language, the Pascal-P2 subset persisted in other dialects, notably Borland Pascal, which copied much of the UCSD dialect.
; FLEX: Developed by the Royal Signals and Radar Establishment, FLEX was implemented in microcode and similar to other early workstation systems such as Lisp machines, UCSD Pascal or Modula-2, except that the language of choice was ALGOL 68.
Apple Pascal is a language and operating system based on the UCSD Pascal system.
There are many historical examples of code running on virtual machines, such as the language UCSD Pascal using p-code, and the operating system Inferno from Bell Labs using the Dis virtual machine.
UCSD and system
The MCP-1600 was used to implement DEC's LSI-11 system and their own Pascal MicroEngine microcomputer which ran the UCSD p-System Version III and UCSD Pascal.
* pseudo-code used in the UCSD p-System (" Pascal system ")
This idea originated as early as in the late 1970s, when the UCSD Pascal system was developed to produce and interpret p-code.
The UCSD people announced they were working on a " native " compiler that would essentially would convert UCSD from an interpreter to a compiled, native system in one step.
In 1996 he became Chancellor of the UCSD campus, then in 2003 was chosen to be the 18th President of the University of California system.
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