Hi Pete,
This is one of the "gotchas" where MAME corrected a mistake in past revisions. The "US" set was actually always the World set and they corrected it in 0.138. As a result, the correct set is still shdancer. ;)
MAME History:
- 0.138: Changed description to 'Shadow Dancer (World)' and clones 'Shadow Dancer (set 2, Japan)' to 'Shadow Dancer (Japan)' and 'Shadow Dancer (set 1)' to 'Shadow Dancer (US)'.
CRC check to confirm there was no change in the ROM set files:
T:\LocalMAME\combined>mame137 -listcrc shdancer
3d5b3fa9 shdancer.a6 Shadow Dancer (set 3, US)
2596004e shdancer.a5 Shadow Dancer (set 3, US)
9bdabe3d mpr12712.b1 Shadow Dancer (set 3, US)
852d2b1c mpr12713.b2 Shadow Dancer (set 3, US)
448226ce mpr12714.b3 Shadow Dancer (set 3, US)
d6888534 mpr12719.b11 Shadow Dancer (set 3, US)
ff344945 mpr12726.a11 Shadow Dancer (set 3, US)
ba2efc0c mpr12718.b10 Shadow Dancer (set 3, US)
268a0c17 mpr12725.a10 Shadow Dancer (set 3, US)
c81cc4f8 mpr12717.b9 Shadow Dancer (set 3, US)
0f4903dc mpr12724.a9 Shadow Dancer (set 3, US)
a870e629 epr12716.b8 Shadow Dancer (set 3, US)
c606cf90 epr12723.a8 Shadow Dancer (set 3, US)
7a0d8de1 epr12720.a4 Shadow Dancer (set 3, US)
07051a52 mpr12715.b4 Shadow Dancer (set 3, US)
T:\LocalMAME\combined>mame138 -listcrc shdancer
3d5b3fa9 shdancer.a6 Shadow Dancer (World)
2596004e shdancer.a5 Shadow Dancer (World)
9bdabe3d mpr-12712.b1 Shadow Dancer (World)
852d2b1c mpr-12713.b2 Shadow Dancer (World)
448226ce mpr-12714.b3 Shadow Dancer (World)
d6888534 mpr-12719.b11 Shadow Dancer (World)
ff344945 mpr-12726.a11 Shadow Dancer (World)
ba2efc0c mpr-12718.b10 Shadow Dancer (World)
268a0c17 mpr-12725.a10 Shadow Dancer (World)
c81cc4f8 mpr-12717.b9 Shadow Dancer (World)
0f4903dc mpr-12724.a9 Shadow Dancer (World)
a870e629 epr-12716.b8 Shadow Dancer (World)
c606cf90 epr-12723.a8 Shadow Dancer (World)
7a0d8de1 epr-12720.a4 Shadow Dancer (World)
07051a52 mpr-12715.b4 Shadow Dancer (World)
[Edit:] Added to the front page under special circumstances. Worth the reference if it's caused confusion. :)