// internal interface for PSG component of YM device
// FIXME: these should be private, but vector06 accesses them directly
void ay8910_write_ym(int addr, uint8_t data)
{
if ((addr & 1) != 0)
{
if (m_active)
{
/* Data port */
if (m_register_latch == AY_ESHAPE || m_regs[m_register_latch] != data)
{
/* update the output buffer before changing the register */
m_channel.update();
}
ay8910_write_reg(m_register_latch, data);
}
}
else
{
m_active = (data >> 4) == 0; // mask programmed 4-bit code
if (m_active)
{
/* Register port */
m_register_latch = data & 0x0f;
}
else
{
logerror("{0}: warning - {1} upper address mismatch\n", machine().describe_context(), name());
}
}
}
//DECLARE_WRITE8_MEMBER(data_w) { write_data(data); }
// VCLK slave mode option
// if VCLK and reset or data is changed at the same time,
// call vclk_w after data_w and reset_w.
//DECLARE_WRITE_LINE_MEMBER(vclk_w);
// option , selected pin selector
/*
* Handle a change of the selector
*/
public void playmode_w(int select)
{
int bitwidth = ((select & 4) != 0) ? 4 : 3;
if ((select & 3) != (((m_s1 ? 1 : 0) << 1) | (m_s2 ? 1 : 0)))
{
m_stream.update();
m_s1 = BIT(select, 1) != 0;
m_s2 = BIT(select, 0) != 0;
/* timer set */
notify_clock_changed();
}
if (m_bitwidth != bitwidth)
{
m_stream.update();
m_bitwidth = (u8)bitwidth;
}
}
// set the current value
protected void set_value(u32 value)
{
m_stream.update();
m_curval = m_value_map[value & (m_value_map.size() - 1)];
}
// update streams
protected virtual ChipClass update_streams()
{
m_stream.update();
return(m_chip);
}