Steeplechase

From Andysarcade.net: This is a picture of an Astroturf-1 pcb.  This is the pcb that was found in my French-made machine.  The board is screened with "Astroturf-1".  It only plays Steeplechase, and there were no other games that ran on this hardware.  The circuit design is completely specific to Steeplechase (Ed. Most pcbs have "Astroturf-1" on them. This was the project name for Steeplechase during its development.). There are one or two blue trace-wire mods on the pcb, as is common on 70's Atari games.  This is a Revision A pcb, so the first type off the line.  The owners manual references a Revision A pcb, along with noting all of the wire hacks.  There are some additional capacitors used on some IC's.  I found a way to control the speed of the game.  The Astroturf-1 pcb that was in the machine when i got it had the following mods on it from the factory:

IC A2 (9316) has a cap from ground to pin 15.  When this was connected, the game ran very fast and was almost unplayable.  When it was removed, it ran at a normal speed.