[MarkMoxon]

It is indeed different on PAL vs NTSC. The code relies on the NMI being called at 50Hz - as a result a number of timings are wrong on the NTSC version, so the music is too fast, the combat demo auto-play doesn't work properly, the time reported for completing the combat demo is wrong, and so on. The NTSC version is unfinished, and this is just one area where it shows.