It took some trial-and-error, but I did it! Here's what I did:
Run MAME32.
Select Carnival. Right-Click to Properties/Controller and Uncheck Joystick control
and Check Mouse control.
Left click and start the game.
At the "CARNIVAL V1.0.1" screen, press F2 for Diagnostic Screen, then wait for Diagnostic Menu.
Using - and = for up/down, highlight GUN CALIBRATION. Then Press F2
Using your mouse, follow directions to Calibrate Left Gun.
Then it will want to Calibrate Right Gun. Press the A key three times.
It will go back to the Diagnostic Menu. Press = down to EXIT, then press 9.
Now Carnevil will shoot properly!
Remember, LEFT ALT key is the RELOAD key!!
(Bats in the) belfry@insightbb.com
--
"The music may be lousy, but at least it drowns out the dialogue."
---Crow T. Robot, MST3K, 'The Wild World of Batwoman'
Winning a war is just as possible as winning an earthquake.
--Washu