I'm thinking both mouse downs are sending mouse button 3 or something.
left button button 0
right button button 1
middle button button 2
Left and right button 3 ? Testing this now. ( nope when pressing both buttons I get mouse 0 and mouse 1, in mame )
I opened note pad typed asdf, the press a button and its still lower case, the pressed the other button and still lower case, does that rule out the shift business?
Hmm, I remember a test debug menu in arkanoid, going to try to find it and see if the buttons are working right.
Ok I got in to debug mode, and both button can not be pressed at once on the mouse emulator but can on the mouse. I will be able to figure this out, thx all!