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The UCSD Pascal compiler was distributed as part of a portable operating system, the p-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 a Pascal programming language system that ran on the UCSD p-System, a portable, highly machine-independent operating system.
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.
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 compiler
The original basis for UCSD Pascal was the p-machine compiler from ETH Zurich the originators of Pascal.
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.
The Apple Pascal software package also included disk maintenance utilities, the Pascal compiler ( set to the UCSD standard ), and a decently-featured assembler to complement the Apple II's built-in " monitor " assembler.
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 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 distributed
In 1991, while at UCSD, Snell founded InterText, an early Internet-based magazine, which was originally distributed via FTP and e-mail in plain-text and PostScript formats.
UCSD and part
The Scripps Institution of Oceanography is often incorrectly associated with TSRI ; it is in fact a nearby research facility that is part of UCSD.
Erected in February 1983 as a part of the Stuart Collection of public art projects, the fiberglass Sun God has become a unique feature on the UCSD campus.
UCSD and portable
* ucsd-psystem-vm, a portable virtual machine for UCSD p-System p-code
UCSD and operating
In addition to PC-DOS, buyers could choose either CP / M-86 or UCSD p-System as operating systems, as well as some flavors of SysV Unix.
Sales revived somewhat, due mostly to Pecan's reasonable pricing structure, but the p-System and UCSD Pascal gradually lost the market to native operating systems and compilers.
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.
CP / M-86 was released a few months after the PC and was one of three operating systems available for purchase from IBM, PC DOS, CP / M-86 and UCSD Pascal.
Apple Pascal is a language and operating system based on the UCSD Pascal system.
It competed with other operating systems written for such computers, such as CP / M-86 and UCSD Pascal.
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.
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