void pc9821_mate_a_state::pc9821ap2(machine_config &config)
{
pc9821(config);
const XTAL xtal = XTAL(66'000'000);
I486(config.replace(), m_maincpu, xtal); // i486dx2
m_maincpu->set_addrmap(AS_PROGRAM, &pc9821_mate_a_state::pc9821_map);
m_maincpu->set_addrmap(AS_IO, &pc9821_mate_a_state::pc9821_io);
m_maincpu->set_irq_acknowledge_callback("pic8259_master", FUNC(pic8259_device::inta_cb));

pit_clock_config(config, xtal / 4); // unknown, fixes timer error at POST