{
  "_notes": [
    "Compiled by Francis De Brabandere.",
    "Frontier (Bally 1980)",
    "https://www.ipdb.org/machine.cgi?id=959",
    "https://opdb.org/machines/1314",
    "Bally MPU AS-2518-35 (U6: 720-40_6.732)",
    "7-digit score display",
    "By default the credits are not shown, set dip switch 27 to show them."
  ],
  "_fileformat": 0.8,
  "_metadata": {
    "version": 2,
    "copyright": [
      "Copyright (C) 2024 by Francis De Brabandere <francisdb@gmail.com>",
      "Copyright (C) 2025 by Tom Collins <tom@scorbit.io>"
    ],
    "license": "GNU Lesser General Public License v3.0",
    "platform": "bally-35-8K",
    "roms": [
      "frontieg",
      "frontier"
    ]
  },
  "game_state": {
    "_notes": [
      "score @ 0x21E, 0x225, 0x22C, 0x233 are display memory, and active in game",
      "during attract, last game scores at 0x248, 0x24F, 0x256, 0x25D"
    ],
    "credits": {
      "label": "Credits",
      "start": "0x02AD",
      "length": 2,
      "encoding": "bcd"
    },
    "scores": [
      {
        "label": "Player 1",
        "start": "0x021E",
        "encoding": "bcd",
        "length": 7
      },
      {
        "label": "Player 2",
        "start": "0x0225",
        "encoding": "bcd",
        "length": 7
      },
      {
        "label": "Player 3",
        "start": "0x022C",
        "encoding": "bcd",
        "length": 7
      },
      {
        "label": "Player 4",
        "start": "0x0233",
        "encoding": "bcd",
        "length": 7
      }
    ],
    "final_scores": [
      {
        "label": "Final Score P1",
        "start": "0x0248",
        "encoding": "bcd",
        "length": 7
      },
      {
        "label": "Final Score P2",
        "start": "0x024F",
        "encoding": "bcd",
        "length": 7
      },
      {
        "label": "Final Score P3",
        "start": "0x0256",
        "encoding": "bcd",
        "length": 7
      },
      {
        "label": "Final Score P4",
        "start": "0x025D",
        "encoding": "bcd",
        "length": 7
      }
    ],
    "current_ball": {
      "label": "Current Ball",
      "start": "0x0B",
      "encoding": "bcd"
    },
    "player_count": {
      "label": "Players",
      "start": "0x0C",
      "encoding": "bcd"
    },
    "current_player": {
      "label": "Current Player",
      "start": "0x0D",
      "encoding": "bcd"
    },
    "ball_count": {
      "label": "Ball Count",
      "encoding": "dipsw",
      "offsets": [
        32,
        31
      ],
      "values": [
        3,
        5,
        4,
        2
      ]
    },
    "max_credits": {
      "label": "Max Credits",
      "encoding": "dipsw",
      "offsets": [
        26,
        25
      ],
      "values": [
        10,
        15,
        25,
        40
      ]
    },
    "game_over": {
      "_notes": "reading 'game over' lamp",
      "label": "Game Over",
      "start": "0x20C",
      "encoding": "bool",
      "mask": "0x4",
      "invert": true
    },
    "tilted": {
      "_notes": "reading 'tilt' lamp",
      "label": "Tilted",
      "start": "0x20C",
      "encoding": "bool",
      "mask": "0x8",
      "invert": true
    }
  },
  "high_scores": [
    {
      "label": "High Score",
      "short_label": "HS",
      "score": {
        "start": "0x02A6",
        "encoding": "bcd",
        "length": 7
      }
    }
  ],
  "audits": {
    "Bookkeeping functions": {
      "05": {
        "label": "Current Credits",
        "start": "0x02AD",
        "length": 7,
        "encoding": "bcd",
        "min": 0,
        "max": 40
      },
      "06": {
        "label": "Total Plays (Paid and Free Games)",
        "start": "0x02B4",
        "length": 7,
        "encoding": "bcd",
        "min": 0,
        "max": 99999
      },
      "07": {
        "label": "Total Replays (Free Games)",
        "start": "0x02BB",
        "length": 7,
        "encoding": "bcd",
        "min": 0,
        "max": 99999
      },
      "08": {
        "label": "Game Percentage",
        "start": "0x02C2",
        "length": 7,
        "encoding": "bcd",
        "min": 0,
        "max": 99999
      },
      "09": {
        "label": "HSTD Achieved",
        "start": "0x02C9",
        "length": 7,
        "encoding": "bcd",
        "min": 0,
        "max": 99999
      },
      "10": {
        "label": "Coin Chute #1",
        "start": "0x02D0",
        "length": 7,
        "encoding": "bcd",
        "min": 0,
        "max": 99999
      },
      "11": {
        "label": "Coin Chute #2",
        "start": "0x02D7",
        "length": 7,
        "encoding": "bcd",
        "min": 0,
        "max": 99999
      },
      "12": {
        "label": "Coin Chute #3",
        "start": "0x02DE",
        "length": 7,
        "encoding": "bcd",
        "min": 0,
        "max": 99999
      },
      "13": {
        "label": "Specials Awarded",
        "start": "0x02E5",
        "length": 7,
        "encoding": "bcd",
        "min": 0,
        "max": 99999
      },
      "14": {
        "label": "Minutes of Game Play",
        "start": "0x02EC",
        "length": 7,
        "encoding": "bcd",
        "min": 0,
        "max": 99999
      },
      "15": {
        "label": "Service Credits",
        "start": "0x02F3",
        "length": 7,
        "encoding": "bcd",
        "min": 0,
        "max": 99999
      }
    }
  }
}