Hello.

my emu detects that load runner use horizontal mirroring. In this mode, everything written to 2000-27FF ($000) goes in name table 0 and everything written to 2800-2FFF goes to name table 1 ($400) right?

Well, turns out that the game is writing to both $2000-$2400 and $2400-$2800 for its 2 name tables, so everythig goes to $000 in my emu and the other name table is empty. Any idea what kind of error my emu suffers? Because on other horizontal mirroring games, it seems to work fine.