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Welcome to CoCo
===============

Welcome to the source code for the CoCo Virtual Machine. CoCo is an 
implementation of the Python Virtual Machine in C++. CoCo is an 
object-oriented implementation of the Python 3.2 virtual machine. 
Documentation for writing programs for CoCo can be found on the 
web at 

http://cs.luther.edu/~leekent/CoCo

There are a few differences in this implementation from the standard 
Python Virtual Machine. Modules are not currently supported. Every 
CoCo program must have a main function since execution starts at the
main function. There are no global variables in CoCo. There are several
extensions of CoCo that support functional programming languages like 
Lisp-like lists, a print function that returns an instance of itself, 
and a print that takes a tuple as its argument. 

CoCo supports exceptions and exception handling, nested functions, looping,
and symbolic target names for branches and jumps. 

The Python programming language was named after Monty Python, a comedy 
troupe from the UK that has passed the test of time. CoCo was named after
the coconut carried by two African Sparrows in Monty Python and the Holy 
Grail. Additionally, my first computer back in 1980 was a Radio Shack
TRS-80 Color Computer, affectionately nicknamed CoCo. The original CoCo 
had a Motorola 6809 processor and my first assembly language program was 
written for this processor, which was NOT a virtual machine. Like the 6809
assembly language that I learned back in 1980, the CoCo VM assembly language 
is a worthwhile language to learn. Virtual machines have become very popular
as embedded systems have proliferated everywhere. I hope you enjoy learning 
to use it and extending it!

  -- Kent D. Lee

Compiling CoCo
==============

CoCo can be built for your platform if you have a C++ compiler and the 
automake tools installed on your computer. The zip file can be downloaded 
from Git Hub if you have not already done so. Alternatively, you can use 
git to create a branch of the project. 

To unzip the file, type

unzip CoCo.zip

Then, execute 

cd CoCo
./configure
make

If anything goes wrong or you add additional source files to the project,
you can execute the rebuild script. However, you should be certain that you
have the automake tools installed on your system in this case. In particular, 
the autoreconf program is used in rebuilding the project. Running the 
rebuild script will tell you what you need to install on most Linux 
distributions. To rebuild run

./rebuild
./configure
make

Running CoCo
============
The coco binary can be installed wherever you like, preferably in your 
path someplace.

You can also download a binary from the website listed above for
Mac OS X, Linux, or Microsoft Windows platforms. 

To run coco simply type

coco file.casm

The file.casm is a file that you provide with a CoCo program in it. 
A casm is a CoCo assembly language program and must be in the format 
described at 

http://cs.luther.edu/~leekent/CoCo

There must be a main function in the casm file where CoCo will begin
executing the Python Virtual Machine instructions. 

Good luck and have fun writing CoCo programs!