MVS coin up question

Okay I must really be missing something here. I just can't find the setting for where to change the four slot over to using just one shooter for both players. Rather than having to have coin 1 and coin 2 there should be a way to just have one for both?
I've got to be missing something, but it is late and I've been up a while.

The short answer is that the dual coin slots is a feature which is only on the USA bios, and you would need to switch to a different bios (nearly any other one will do) to get single coint counter operation.