static void bandido_74123_0_output_changed_cb(void)
{
SN76477_vco_w (0, TTL74123_output_r(0));
SN76477_mixer_a_w(0, !TTL74123_output_r(0));
SN76477_enable_w(0, TTL74123_output_comp_r(0) && TTL74123_output_comp_r(1));
}
static MACHINE_INIT( crbaloon )
{
/* MIXER A = 0, MIXER C = 1 */
SN76477_mixer_a_w(0, 0);
SN76477_mixer_c_w(0, 1);
/* ENVELOPE is constant: pin1 = hi, pin 28 = lo */
SN76477_envelope_w(0, 1);
/* fake: pulse the enable line to get rid of the constant noise */
SN76477_enable_w(0, 1);
SN76477_enable_w(0, 0);
}
void init_machine_invaders(void)
{
install_port_write_handler(0, 0x03, 0x03, invaders_sh_port3_w);
install_port_write_handler(0, 0x05, 0x05, invaders_sh_port5_w);
SN76477_envelope_1_w(0, 1);
SN76477_envelope_2_w(0, 0);
SN76477_mixer_a_w(0, 0);
SN76477_mixer_b_w(0, 0);
SN76477_mixer_c_w(0, 0);
SN76477_vco_w(0, 1);
}
void init_machine_invad2ct(void)
{
init_machine_invaders();
install_port_write_handler(0, 0x01, 0x01, invad2ct_sh_port1_w);
install_port_write_handler(0, 0x07, 0x07, invad2ct_sh_port7_w);
SN76477_envelope_1_w(1, 1);
SN76477_envelope_2_w(1, 0);
SN76477_mixer_a_w(1, 0);
SN76477_mixer_b_w(1, 0);
SN76477_mixer_c_w(1, 0);
SN76477_vco_w(1, 1);
}
void init_machine_sheriff(void)
{
install_port_write_handler(0, 0x04, 0x04, sheriff_sh_port4_w);
install_port_write_handler(0, 0x05, 0x05, sheriff_sh_port5_w);
install_port_write_handler(0, 0x06, 0x06, sheriff_sh_port6_w);
TTL74123_config(0, &sheriff_74123_0_intf);
TTL74123_config(1, &sheriff_74123_1_intf);
/* set up the fixed connections */
TTL74123_reset_comp_w (0, 1);
TTL74123_trigger_comp_w(0, 0);
TTL74123_trigger_comp_w(1, 0);
SN76477_envelope_1_w(0, 1);
SN76477_envelope_2_w(0, 0);
SN76477_noise_clock_w(0, 0);
SN76477_mixer_a_w(0, 0);
SN76477_mixer_c_w(0, 0);
}
