"A bootleg has been found that matches "sidearmsj" but with the
starfield data ROM being half the size of the original one and
containing its second half. Also, it seems that, as the original
game it's currently emulated, it uses just the first half of the
starfield ROM, so it's something worth checking."
I sitting here and thought myself. How this going to solve the starfield issue? This is on a bootleg that haven't been dump yet.
Sorry I had to share my thoughts on what I read from the driver.