Is there anything special with the use Zelda 2 makes of Mapper #1 ? What Firebug says works with several title (Dr Mario, Zelda 1, Metroid) but in Zelda 2 I get buggy graphics in "map mode", and in the villages.

Also with Zelda 2 (but this has nothing to do with mappers apparently) I get control bugs : pressing left and right simultaneously makes Link "slide". Is it necessary to prevent two directional controls to be pressed simultaneously ?

Thanks.