[ghostdwl]

I'm looking for a graph in memory during gameplay, I know the location of this graph out of memory, is there any way I can find the function that writes the graph or its location in memory?
I know how to use the debugger and program in reverse language of the psx, then skip the initial explanations.

[tvtoon]

Well, seems you don't know about CDROM commands, that is probably what you are looking for... check nocash etc documentation for how it is used.

There is a specific set of them for reading sectors and blocks.

[Valendian]

Texture and sprite data must be DMA transferred to VRAM. Polygons must be drawn. The pSX emulator has a debug menu which allows you to debug gpu commands. You can capture a number of frames and it will allow you to step through the rendering of each frame one polygon at a time. For each polygon you can see which function issued the draw command.