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https://github.com/ikorb/gcvideo

GameCube Digital AV converter
https://github.com/ikorb/gcvideo

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GameCube Digital AV converter

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README 

        
# GCVideo #



GCVideo is a small series of FPGA boards and VHDL projects

capable of converting the

GameCube's Digital Video port signals to standard video signals

without using the custom chip in the original component video cable.

There are currently VHDL projects for multiple FPGA boards, including

a Gamecube-to-DVI version for the KNJN Pluto IIx-HDMI and a

Gamecube-to-Component/RGB version for a board called GCVideo Lite

which is also documented in this repository.

GCVideo Lite has also been adapted to be used as

an RGB DAC for the Nintendo 64.



The schematics and layout are in the [Hardware](Hardware) directory

and the HDL projects are in the [HDL](HDL) directory. Each directory

should contain README.md files with further information.



## Mini-FAQ ##



1. I want one, how much is it?  

    I do not sell any hardware. Since this is an open-source project,

    other people will probably offer ready-made boards or modding

    services.



    GCVideo-DVI is based on a readily-available, commercial FPGA

    development board, so you could just buy that, flash it and

    install it yourself (or find someone to do it for you).



1. But why don't you just sell it?  

    Building hardware to be sold is a lot of work and requires much

    time that I'd rather use for something more

    interesting. Furthermore, the local laws require quite a bit of

    paperwork and investment to legally sell electronic devices that

    you build and I'd prefer not to deal with all of that.



1. You said your prototype came from OSHPark, so you have at least

    three boards. Can't you sell me one of them?  

    No, they're all accounted for already.



1. Why did you use that weird Video-DAC, it's a non-stock part at

    Digikey!


    It wasn't when I designed the board some months ago... Instead it

    was the cheapest 24-bit video DAC available. It shouldn't be hard

    to adapt the design to a different DAC as long as it has 24 bit

    parallel input and a single-pumped clock. For YPbPr output, the

    DAC also needs to be able to generate a small offset on the Y line

    so that syncs can be generated below the blanking level.



1. Uh, it says XO2-256 in the schematic, but XO2-640 in the BOM. Which

    is the correct one?  

    The original plan was to use an XO2-256, but adding the color

    space conversion for RGB output increased the size of the design

    too much. It was left as an XO2-256 in the schematic to ensure

    only pins available on that chip are used, so a slightly cheaper

    Component-only version can be built.



1. What about line-doubling?  

    GCVideo Lite (the analog version) uses the smallest FPGA that

    could fit everything needed, but this chip does not have enough

    BlockRAM available to generate a line-doubled picture. It could be

    updated by using a larger, footprint-compatible FPGA, but since

    480i/576i are well-supported on component inputs and 240p/288p are

    rarely used by Gamecube titles this has not been attempted yet.



    GCVideo DVI fully supports line-doubling and can also overlay

    scanlines on the line-doubled picture if desired.



# Licence #




Copyright (C) 2014-2021, Ingo Korb <[email protected]>

All rights reserved.



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.