This game has debugging material.
Present in the service menu is a disabled debug options menu. Add the following to vaportrx.xml:
<mamecheat version="1"> <cheat desc="Enable Debug Options"> <script state="run"> <action>maincpu.pb@800D02CC=00</action> </script> </cheat> </mamecheat>
Enable the code then enter the service menu and select the invisible option in between STATISTICS and GAME OPTIONS and you'll appear in the hidden debug options menu. Changing Development to Yes will add a couple of options to the service menu: SCOPE LOOPS and SET BRAM TO FACTORY DEFAULTS.
Selecting SCOPE LOOPS takes you to this menu. It's currently unknown what this was used for. Selecting SET BRAM TO FACTORY DEFAULTS will reset all settings and best times back to default.
In-Game Debug Display
Pressing Player 2 Start (2 key in MAME) will toggle a couple of debug displays while in-game.