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CCPU for GA144

// repository documentation

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ga144tools - Python toolchain for GA144
=======================================

This package is an alternate toolchain for GA144 CPUs. The tools are all Python-based,
and the only additional requirements are 
[PySerial](http://pyserial.sourceforge.net/) and the m4 utility.

For example, [fibonacci.ga](src/fibonacci.ga) counts in the Fibonacci sequence in node 608, and transmits the integers back to the PC via the serial port on node 708.

![Alt text](https://raw.githubusercontent.com/jamesbowman/ga144tools/master/src/pictures/helloworld.ga.png)

It writes the integer sequence on the serial port:

2
    3
    5
    8
    13
    21
    etc.
  
Another example, 
[mathdemo.ga](src/mathdemo.ga) counts up from 100, on node 008.
Nodes 108 through 608 are wire nodes; they just carry data upwards towards node 708.

![Alt text](https://raw.githubusercontent.com/jamesbowman/ga144tools/master/src/pictures/mathdemo.ga.png)

To use it, connect the USB cable to USB port A on your GA144 board, and (assuming your device is at /dev/ttyUSB0) do:

cd src
    python asm.py /dev/ttyUSB0 fibonacci.ga

You should see something like this:

...
    bootstream is 906 words
    ---------  DOWNLOAD COMPLETE  ----------
    0x00002  2
    0x00003  3
    0x00005  5
    0x00008  8
    0x0000d  13
    0x00015  21
    
There is a utility to read and write directly to the onboard flash.
To read the first 128K into `filename.bin`:

./flash.py $P read filename.bin 131072

To write `image` to flash:

./flash.py $P write image

Instruction set notes:

https://mschuldt.github.io/www.colorforth.com/inst.htm

https://mschuldt.github.io/www.colorforth.com/arith.htm

https://mschuldt.github.io/www.colorforth.com/etherCode.htm

Booting:

http://www.forth.org/svfig/kk/11-2013-Shattuck.pdf

ga144tools

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