void by133_state::granny(machine_config &config)
{
babypac(config);
MC6809(config.replace(), m_videocpu, XTAL(8'000'000)); // MC68B09P (XTAL value hard to read)
m_videocpu->set_addrmap(AS_PROGRAM, &by133_state::granny_map);
TMS9928A(config, m_crtc2, XTAL(10'738'635)).set_screen("screen");
m_crtc2->set_vram_size(0x4000);
m_crtc2->int_callback().set_inputline(m_videocpu, M6809_IRQ_LINE);
subdevice<screen_device>("screen")->set_screen_update(FUNC(by133_state::screen_update_granny));
}
