machine:

Config file section

Valid in machine config files YES
Valid in mode config files NO

The machine: section of your config is where you configure defails about the number of balls in your machine.

Optional settings

The following sections are optional in the machine: section of your config. (If you don’t include them, the default will be used).

balls_installed:

Single value, type: integer. Default: 1

The (maximum) number of balls which should be installed in your machine.

min_balls:

Single value, type: integer. Default: 1

The minimum number of balls required to start a game. If less than min_balls are present MPF will refuse to stat a game.