Hi guys, Recently I've been working on GBARunner2, a gba hypervisor for the ds (run gba games from your slot 1 card), and it currently works quite well already with a couple of games. However, to improve the compatibility, it would be very nice if I could debug it, but currently that's impossible. To run the gba games, the gba bios is loaded in the first half of the itcm and the protection unit is configured to capture all accesses that are different on a ds from a gba. To make the gba bios actually work, the cp15 is used to switch to low vector mode, but no$gba doesn't seem to support that. It tries to use the high vectors (=ds bios), ruining everything. I also tried desmume, but even though it supports the low vectors, it doesn't emulate prefetch and data aborts, also a core part of GBARunner2. Anyway, it would be very nice if @nocash could implement low vectors, because it would probably help me a lot (and improve accuracy). Thanks on forehand. The source of GBARunner2 is here: https://github.com/Gericom/GBARunner2 If you try it, make sure your card is fat32 formatted!