The system 1 board is a plug-in replacement for the original Gottlieb System 1 CPU.  It supports all of the games in the platform series, and provides considerable diagnostic capability for the technician when troubleshooting where a game may be malfunctioning.  The entire game software has been re-written with an emphasis on maintaining the timing and compatibility of the original board, however with quite a bit more functionality added in:

Key Benefits

• Direct replacement of the original System1 board.
• 3-month warranty.
• All game code completely re-written (with some minor original Gottlieb glitches omitted!)
• Eighten years in business with thousands of boards sold internationally.
• Text based diagnostics menu system that allows operator settings previously done via DIP switches to be entered via front door switches.
• Tests that cycle repeatedly (until timeout) to help isolate faults.
• Display test to exercise all digit segments (numbers), and to strobe each digit independently to check for display (UDN6118) shorts.
• Solenoid test that exercises each coil including lamp controlled coils (when DIP switch configuration set for such a game)
• Power-up code revision and game setting displayed for quick diagnostic configuration identification.
• Switch test that detects dirty switches on the playfield.
• All 16 System 1 games are included on one board with no ROM swapping required.
• Original MPU functionality has been closely duplicated and adds many optional features including:
  • Free game mode
  • Updated game options for many games to allow add-a-ball mode (multiple free-balls awarded during a single ball) where the playfield challenge is completely reset once after scoring the free-ball / special.
  • Menu options to disable add-a-ball (for operators who requested it!)
  • Restore factory-settings option for quick reset of settings.
• Open-collector output logic with zener diode protection for all solenoid circuits and lamp select lines to prevent CPU damage from a damaged driver board.
• Battery-less operation - all settings and high-score data are stored in NVRAM with >100,000 write cycles.
• Designed for low-cost component repair and maintenance on I/O sensitive components (exposed to bad displays / bad driver boards, etc.)
• Stuck switches are ignored and do not impair the rest of the games operation, including the slam switch!