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.\" UCSD p-System virtual machine
.\" Copyright (C) 2006, 2010 Peter Miller
.\"
.\" This program is free software; you can redistribute it and/or modify
.\" it under the terms of the GNU General Public License as published by
.\" the Free Software Foundation; either version 2 of the License, or
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.\" This program is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" General Public License for more details.
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The ucsd-psystem-vm package is a portable virtual machine for the UCSD p-System. .br[ Download | .\" Mailing List | Online Repository ] .br .\" ------------------------------------------------------------------------ .br |
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About This ProjectThe .br ucsd-psystem-vm project is a portable virtual machine .br (p-code interpreter) for the UCSD p-System. It supports execution of Apple ][ Pascal programs, it can even display TurtleGraphics using X11.This is a re-packaging of the excellent p-interp program by Mario Klebsch. |
Ancient HistoryThe UCSD p-System is a portable operating system that was popular in the early days of personal computers, in the late 1970s and early 1980s.Like today's Java, it was based on a “virtual machine” with a standard set of low level, machine language like .br “p-code” instructions that were emulated on different hardware, including the 6502, the 8080, the Z-80, and the PDP-11. In this way, a Pascal compiler that emitted .br p-code executables could produce a program that could be run under the p-System on an Apple II, a Xerox 820, or a DEC PDP-11. The most popular language for the p-System was UCSD Pascal. In fact, the p-System operating system itself was written in UCSD Pascal, making the entire operating system relatively easy to port between platforms. By writing a .br p-code interpreter in the platform's native assembly language, and a few minimal hooks to operating system functions for the file system and interacting with the user, you could move a .br p-code executable from another system and run it on the new platform. In this way, the .br p-code generated on one computer could be used to bootstrap the port of the p-System to another computer. From the Jefferson Computer Museum web site. | ||||||
See Also
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Sister Projects
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| .br The ucsd-psystem-vm package is freely distributable under the terms and conditions of the GNU GPL. .br |
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There is more software by Mario Klebsch at his home page.
There is more Software by Peter Miller at his home page. .\" .\" ucsd-psystem-vm is developed using Aegis, a transaction based .\" software configuration management system. .\" The Aegis repository for this project is available. .br |
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