// license:BSD-3-Clause // copyright-holders:smf #include "emu.h" #include "output_latch.h" DEFINE_DEVICE_TYPE(OUTPUT_LATCH, output_latch_device, "output_latch", "Output Latch") output_latch_device::output_latch_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, OUTPUT_LATCH, tag, owner, clock) , m_bit_handlers{ { *this }, { *this }, { *this }, { *this }, { *this }, { *this }, { *this }, { *this } } , m_bits{ -1, -1, -1, -1, -1, -1, -1, -1 } { } void output_latch_device::device_resolve_objects() { for (devcb_write_line &handler : m_bit_handlers) handler.resolve_safe(); } void output_latch_device::device_start() { save_item(NAME(m_bits)); } void output_latch_device::write(uint8_t data) { for (unsigned i = 0; 8 > i; ++i) { int const bit = BIT(data, i); if (bit != m_bits[i]) { m_bits[i] = bit; if (!m_bit_handlers[i].isnull()) m_bit_handlers[i](bit); } } }