Quote:

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734 static INPUT_PORTS_START( coolpool )
735 PORT_START("IN0")
736 PORT_BIT( 0x00ff, IP_ACTIVE_HIGH, IPT_UNKNOWN )
737 PORT_BIT( 0x0f00, IP_ACTIVE_LOW, IPT_UNKNOWN )
738 PORT_BIT( 0x1000, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
739 PORT_BIT( 0x2000, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1)
740 PORT_BIT( 0xc000, IP_ACTIVE_LOW, IPT_UNKNOWN )

The missing 2nd button input is for "English" when pressed in game you can choose to add spin screw or side
to the cueball before playing a shot which is a must have feature in a pool game .
From studying how the other inputs in the driver were setup i took a best guess at how to add the 2nd button input to cool pool and i lucked out and now the game has full controls

For the record here's how to add the missing input button 2

Quote:

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static INPUT_PORTS_START( coolpool )
PORT_START_TAG("IN0")
PORT_BIT( 0x00ff, IP_ACTIVE_HIGH, IPT_UNKNOWN )
PORT_BIT( 0x0f00, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x800, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2)
PORT_BIT( 0x1000, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
PORT_BIT( 0x2000, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1)
PORT_BIT( 0x4000, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1)
PORT_BIT( 0xc000, IP_ACTIVE_LOW, IPT_UNKNOWN )