Do you have the schematics? The start button starts up the score motor, which in turn activates the switches for the reset. Score wheels zero, drop targets reset, credit wheel lowers, lights reset, bonus reset, etc. It's all dependent on the mech's of the game itself on what should happen. The order of the process is dependent on the placement of the switchs on the motor.

Your Star Pool, being a 4 player game and having no "EM memory retention," would have the same sequencing happen upon draining the ball, tripping the switch for the end of ball, and resetting for the next ball.

If you don't have the paperwork, call Steve Young. Prop the PF up and activate the end of ball switch and manually manipulate the mechs of the game, you should be able to watch the SM and locate the different switches based upon the sparks and the activities on the PF to see the different sequencing. If you have the paperwork, it's all there...

Look '96stang if your going to get into the older pins you have to read up on them first,
I would suggest the PINBALL MACHINE MAINTENANCE BOOK by HENK DE JAGER
it will go over EMs from Bally, Wms, & GTB and give you a good idea whats going on when you press start.
Then you can figure the differences of the 3 and how they went about starting and finishing a game.