gigatron/rom/Contrib/tbraun-de

pytron

First working, but slow attempt of a python port of the C Gigatron emulator in ../../Docs/gtemu.c.

Gigatron Mac

Fully featured Gigatron emulator for Mac OS X, written in Objective-C and using XCode.

Features:

• simulated 50Hz VGA output
• 44.1kHz audio output
• keyboard and simulated controller input
• load .gt1 files directly into RAM
• watch .gt1 files for changes and re-load automatically
• switch between 32kB / 64kB RAM
• rudimentary debugging with disassembly of native CPU and vCPU code, instruction stepping and vCPU stepping
• watch CPU and vCPU state
• RAM gadget (256x256 pixel screen to display RAM content, one pixel for every byte)

Known issues:

• Simulated keypresses sometimes hang
• vCPU stepping interrupts on every change of vPC, but vPC sometimes changes during execution of a vCPU call (e.g. jumps)
• Window position and configuration data is not properly saved and restored on restart of the application
• Due to the author not having written code for some years, the code could certainly be better in a lot of places ... :-)

gasm

Gigatron assembly code. You need to first build at67's assembler (by using cmake in Contrib/at67) and then running e.g.

../../at67/tools/gtasm/gtasm ./maze.gasm 0x0200

• maze.gasm : Every platform needs a maze builder, this is an iterative implementation instead of a recursive one (our call stack is not that big...)

tools

• img2gasm.py : Reads an image (should be roughly in 4:3 format) converts it to the gigatron color space and outputs a gigatron assembly program. The resulting program can then be compiled and will be loaded directly into video RAM. In order not to interfere with the loader itself, three lines will be left out during loading and reconstructed from another memory area after loading.

Licence

Copyright 2018-2019 Tobias Braun Mail: tobias@braun-online.org Web: https://home.640k.de

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.