If you're wanting exactly what is in that video you posted.

mGBA

In Options:

Be sure to select GBC and not auto detect for Gameboy titles.

Also have a gbc_bios.bin file correctly placed in the bios folder.

And don't skip the bios start up screen (Nintendo logo animation).

In Gambatte, change Emulated hardware to GBC.

@cthulhus You can edit the es_inputs.cfg and disable the start and select buttons so you can't access to that menu until you replace the original es_inputs again.

@mitu said in Can you change the Virtual Boy color?:

@Jiryn said in Can you change the Virtual Boy color?:

Is that the command-X quick key when in game?

Yes, that's how you access it. There should be an Options menu entry in the list, enter it (A) and then you can change that option (use the D-Pad). After setting it, just exit and restart the game.

EDIT: you also change the palette to B&W (instead of black and red) from the same Options menu.

Thank you so much!

@mitu I did that, and it didn't solve anything, I am just going to use mame2010 and fbneo for now.

@Efriim Doing this step by step only:

https://retropie.org.uk/forum/topic/16145/retropie-upgrading-raspbian-jessie-to-stretch

After finished there are some errors in libraries that made crash emulationstation but they are easy to solve. Once it runs very well including with overclocking. With this fan “Noctua Premium Fan, Brown, NF-A4X10-FLX 5V” I could overclock and no problems.

@sonpluck

Not a problem.

@shinyabsol i wrote a guide a while back about the custom gameboy palette and how to do so properly.

https://retropie.org.uk/forum/topic/9769/game-boy-custom-palette

@itsnitro There is a wiki page for that:

https://github.com/RetroPie/RetroPie-Setup/wiki/Shaders-and-Smoothing

Now, finally I found another image from the retropie facebook grp... tried it and BAM, no more color problems!!! Wth?
Guess I need to compare the configs since this last one was pre-configured for crt.

Awesome! :) Who would have thought-.. Thanks all!

@dankcushions I'd imagined this much. Thanks for the reply.

@backstander

Game mode was it! I'm dumb! Thanks...

@mediamogul I even owned the original Gameboy and Gameboy color and I totally forgot about the colourisation on original GB games on the GBC . Amazing that the emulation takes that into account.