INPUT_PORTS_END
void icecold_state::machine_reset()
{
// CH-C is used for generate a 30hz clock
ay8910_set_volume(m_ay8910_0, 2, 0);
m_rmotor = m_lmotor = 10;
m_sint = 0;
m_motenbl = 0;
m_ball_gate_sw = 1;
}
static WRITE8_DEVICE_HANDLER( ay8910_port0a_w )
{
/* bits 0-2 go to a 74LS156 with open collector outputs
* one out of 8 Resitors is than used to form a resistor
* divider with Analog input 5 (tromba)
*/
// bits 3-4 control the analog drum emulation on 8910 #0 ch. A
static const int table[8] = { 8200, 5600, 3300, 1500, 820, 390, 150, 47 };
int b0, b1, b2, ba, v;
b0 = data & 0x01;
b1 = (data & 0x02) >> 1;
b2 = (data & 0x04) >> 2;
ba = (b0<<2) | (b1<<1) | b2;
/* 150 below to scale to volume 100 */
v = (150 * table[ba]) / (4700 + table[ba]);
//printf("dac1w %02d %04d\n", ba, v);
ay8910_set_volume(device->machine->device("ay2"), 1, v);
}
