Question to the Atari brain trust: which ST emulator is the most accurate one? I have an old ST app I wrote, which prompts a weird message about ‘getting origin

Question to the Atari brain trust: which ST emulator is the most accurate one? I have an old ST app I wrote, which prompts a weird message about ‘getting original roms’ or some such before it quits when run on Hatari. I found a printout of the source a couple of years ago in some forgotten basement, and there is a check for Xbios(2/3) or similar before this prompt. No clue what this was about, after 35 years of writing it. If anyone has some pointers, that would be great.