This release contains 156 files and roughly 409924 bytes...
current status : Almost OK, the major parts are working (doc/, ISM/, JScore/, JSgui).
OTOH, some old tests are BORK because of a recent major opcode map redesign.
Welcome to this VSP directory.
"VSP" means "Very Simple Processor" (officially)
and designates a 32-bit microcontroller that I have imagined,
in parallel (and sometimes in contradiction) with the F-CPU project.
My first goal is to design something so simple that I can
develop it alone, with very little means and efforts.
This forces me to make some curious and counter-intuitive decisions
so "VSP" might be "Virtual Stupid Past-time" as well.
My other goal is to enable anybody, not just VHDL and CPU architecture gurus,
but also computer hobbyists or even students,
to understand, use and even participate in this project.
So this package is not just a simulator, an assembler, a disassembler,
a manual, a development tool, it is all that and more !
Every part is integrated in the others (and vice versa),
so the whole is coherent, easy to use and quick to develop (and to maintain,
The only requirement is that Firefox
(or any other Gecko-based browser) is installed on your computer :
Supporting other browser's JS engines would make development uselessly painful.
Remember that the VSP's philosophy is to make everything so dumb simple
(often by choosing unusual methods) that we can concentrate on the real
issues of CPU development.
Happy clicking !
Description, documentation and references (/doc directory)
The general introduction to the VSP : the must-read. (ok)
The assembly langage manual. (almost complete)
The original text-only draft.
Several aspects are outdated so please refer to the above first link in priority.
The interactive opcode map of the VSP. (ok)
You can reach a specific opcode from another page, for example :
Some statistics are also generated on the fly
form usage and
The Interactive Assembler is a simple form
that lets you assemble single instructions. It's very handy for testing.
It is now exported to other windows, like this :
add d0 d1
and it also provides disassembly of single opcodes :
The pages of the Instruction Set Manual of the VSP (/ISM directory)
They can be accessed from anywhere, for example by clicking on the corresponding
name in the interactive opcode map
or in the floating assembler window. (ok but missing examples)
Various early clickodromes, prototypes and sandboxes (/test directory)
definitions and small utilities to make the simulator tick, without communication with
any user interface.
in order to keep it separated from the real core files.
The issues.txt lists some known issues and some rationales...
The updates.txt keeps the track of the major changes
applied to the files.
- Please keep in mind that this work is constantly in progress, the files change often and bugs appear and disappear without prior notice.
- Check the updates.txt file for the latest changes, known bugs and missing features.
- All these files are (C) Yann Guidon 2002-2007 and are only provided for the visitor's fun.
- These pages are barely W3C-compliant, I just want them to work under Firefox.
I'm an electronician, not a web designer !
- Thanks to all people who have helped (directly or indirectly) with code, comments and insight