@TofiToffee Yes, exactly. There's also a list of offsets to each column of pixels. But that is not in the animation.

@makhowastaken I'm glad it works! I still can't explain the difference though. I hope you don't mind that 4 pixel "bug" in your logo.

@makhowastaken OK. I can't identify the issue in the code. Maybe your FPGA has addresses shifted? Weird. Try my latest commit: enable SPI_OSDADDR_OFFSET in custom options (defs.h). It might not be full fix but it could tell us more. Also, is horizontal scrolling in menu smooth or kinda jumping?

@makhowastaken Nice to see some progress. It might still be an issue with timing, i am not sure, though. Could you try to change logo.png into something that would cover entire screen? I want to see if it has the same issue or not.

Logic analyzer + libsigrok + #gameboy = screen capture.

@makhowastaken This looks like SPI timing issue. Increase time in every call to function 'spi_wait' in file 'spicmd.c'. Or change that function ... for testing. Something like 'ttt += 4' before 'while' loop. Find out values that work for you but don't slow OSD down too much.

You can now find me on elephant-based social web which can not be named here. If you are interested.

Also note that usage will be limited to this specific Gameboy Pocket IPS LCD kit that already had OSD in a first place. It can't add OSD functionality if FPGA does not support it! But it could be useful code base for other models.

@ReverseRetro Yeah, game palette can be fully customized. But OSD it's much worse. OSD uses 4bpp (16 colors) but 14 colors can't be changed and 10(!) are always black. You can only customize one color and the other remaining index will be inverse of that. Resolution of OSD is also hardcoded.

@furrtek That is quite capable little FPGA. Thanks.

@ReverseRetro Kinda. That small IC is STC8G1K17 MCU. It controls OSD and holds settings in flash. It uses SPI to command main video IC (which is unmarked). I have already identified many commands.

Finally, i have released demo WAD of my ACE Engine. It uses code execution to inject new features to the original #doom2 game. It runs in #DOS!

OK. This is how Doom can be more 3D. Technical explanation:

OK, now we can have wire mesh 3D floors.