void pia6821_device::set_out_cb2(int data)
{
int z = cb2_output_z();
if ((data != m_out_cb2) || (z != m_last_out_cb2_z))
{
m_out_cb2 = data;
m_last_out_cb2_z = z;
// send to output function
if (!m_cb2_handler.isnull())
{
m_cb2_handler(m_out_cb2);
}
else
{
if (m_out_cb2_needs_pulled)
{
logerror("PIA #%s: Warning! No port CB2 write handler. Previous value has been lost!\n", tag());
}
m_out_cb2_needs_pulled = true;
}
}
}
void via6522_device::device_reset()
{
m_out_a = 0;
m_out_ca2 = 1;
m_ddr_a = 0;
m_latch_a = 0;
m_out_b = 0;
m_out_cb1 = 1;
m_out_cb2 = 1;
m_ddr_b = 0;
m_latch_b = 0;
m_t1cl = 0;
m_t1ch = 0;
m_t2cl = 0;
m_t2ch = 0;
m_pcr = 0;
m_acr = 0;
m_ier = 0;
m_ifr = 0;
m_t1_active = 0;
m_t1_pb7 = 1;
m_t2_active = 0;
m_shift_counter = 0;
output_pa();
output_pb();
m_ca2_handler(m_out_ca2);
m_cb1_handler(m_out_cb1);
m_cb2_handler(m_out_cb2);
}
void via6522_device::shift()
{
if (SO_O2_CONTROL(m_acr) || SO_T2_CONTROL(m_acr))
{
m_out_cb2 = (m_sr >> 7) & 1;
m_sr = (m_sr << 1) | m_out_cb2;
m_cb2_handler(m_out_cb2);
/* this should be one cycle wide */
m_cb1_handler(0);
m_cb1_handler(1);
m_shift_counter = (m_shift_counter + 1) % 8;
if (m_shift_counter)
{
if (SO_O2_CONTROL(m_acr)) {
m_shift_timer->adjust(clocks_to_attotime(2));
} else {
m_shift_timer->adjust(clocks_to_attotime((m_t2ll + 2)*2));
}
}
else
{
if (!(m_ifr & INT_SR))
{
set_int(INT_SR);
}
}
}
