Oh, sure you could open them. They just don't give any graphical output; this is by design. * testadd: This is just a test ROM for the ADD instruction, and should be stepped through in debug mode. * testmul: A test of MUL, to be stepped through also. * testdiv: A test of a divide algorithm, which happens to test the overflow flag; should be stepped through. * bioshack.bin: My small hack of the GBA BIOS; probably shouldn't be loaded in as a game ROM. Thanks for trying them though! <{POST_SNAPBACK}> ok thanks