static WRITE8_DEVICE_HANDLER( draco_sound_g_w )
{
cidelsa_state *state = (cidelsa_state *)device->machine->driver_data;
/*
G1 G0 description
0 0 IAB inactive
0 1 DWS write to PSG
1 0 DTB read from PSG
1 1 INTAK latch address
*/
switch (data)
{
case 0x01:
ay8910_data_w(device, 0, state->draco_ay_latch);
break;
case 0x02:
state->draco_ay_latch = ay8910_r(device, 0);
break;
case 0x03:
ay8910_address_w(device, 0, state->draco_ay_latch);
break;
}
}
UINT8 a2bus_arcboard_device::read_c0nx(address_space &space, UINT8 offset)
{
switch (offset)
{
case 0:
return m_tms->vram_read(space, 0);
case 1:
return m_tms->register_read(space, 0);
case 6:
return ay8910_r(m_ay, space, 0);
}
return 0xff;
}
/* this port is also used to read printer data */
static READ8_DEVICE_HANDLER ( oric_via_in_a_func )
{
oric_state *state = device->machine().driver_data<oric_state>();
address_space *space = device->machine().device( "maincpu")->memory().space( AS_PROGRAM );
/*logerror("port a read\r\n"); */
/* access psg? */
if (state->m_psg_control!=0)
{
/* if psg is in read register state return reg data */
if (state->m_psg_control==0x01)
{
return ay8910_r(space->machine().device("ay8912"), 0);
}
/* return high-impedance */
return 0x0ff;
}
/* correct?? */
return state->m_via_port_a_data;
}
static WRITE8_DEVICE_HANDLER( redalert_AY8910_w )
{
/* BC2 is connected to a pull-up resistor, so BC2=1 always */
switch (data & 0x03)
{
/* BC1=0, BDIR=0 : inactive */
case 0x00:
break;
/* BC1=1, BDIR=0 : read from PSG */
case 0x01:
ay8910_latch_1 = ay8910_r(device, 0);
break;
/* BC1=0, BDIR=1 : write to PSG */
/* BC1=1, BDIR=1 : latch address */
case 0x02:
case 0x03:
default:
ay8910_data_address_w(device, data, ay8910_latch_2);
break;
}
}
static READ8_DEVICE_HANDLER( zaccaria_port0a_r )
{
return ay8910_r(device->machine->device((active_8910 == 0) ? "ay1" : "ay2"), 0);
}
static READ8_DEVICE_HANDLER( zaccaria_port0a_r )
{
laserbat_state *state = device->machine().driver_data<laserbat_state>();
device_t *ay = (state->m_active_8910 == 0) ? state->m_ay1 : state->m_ay2;
return ay8910_r(ay, 0);
}
static READ8_DEVICE_HANDLER( zaccaria_port0a_r )
{
zaccaria_state *state = device->machine().driver_data<zaccaria_state>();
return ay8910_r(device->machine().device((state->m_active_8910 == 0) ? "ay1" : "ay2"), 0);
}
static READ8_DEVICE_HANDLER( zaccaria_port0a_r )
{
laserbat_state *state = (laserbat_state *)device->machine->driver_data;
running_device *ay = (state->active_8910 == 0) ? state->ay1 : state->ay2;
return ay8910_r(ay, 0);
}
