@BuZz said in MAME 2003 "vector" games only displaying 1/4 of screen after updating - what needs to be edited?: BTW the vector games did work on the last binary so it may have been a core option affecting this. there has been some fixes since then though including some relating to the new vector code and the settings, but the last binary is not "old" (It's from the 11th October). I will update the binary though. Thank you @BuZz if there are still problems with vectors in mame2003 after this binary update I will work to resolve them.