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To go back to your specific case :
* to see if the gfx are uncompressed, do a hex search in the ROM for the data you have found in VRAM at address 0x57A0 (45 54 24 65...)
* if you don't find them, then they are likely compressed. From what I see, it's possible that the routine at 0xF8C computes the command word from what was put in A1. So this routine must be, or call, the decompression routine, and you'll have to study it. It's not a beginner job.Well, I was kinda expecting this hehehehe. I'm no expert but I'll try studying documents and this particular "routine". I just needed some "professional" look to tell me if this could effectively be a decompression routine. Thanks again.