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m_uart->dtr_handler().set(FUNC(apple_imagewriter_printer_device::dtr_handler));

...

void dtr_handler(uint8_t data) 
{
	output_dsr(data);
}

	TTL74123(config, m_pulse1, 10000, 1000e-12);     // second stage (hooked up to 1 section of 74123)
	m_pulse1->set_connection_type(TTL74123_NOT_GROUNDED_NO_DIODE);
	m_pulse1->set_clear_pin_value(1);  // not clear
	m_pulse1->set_b_pin_value(1);
	m_pulse1->out_cb().set(FUNC(apple_imagewriter_printer_device::pulse1_out_handler));

	TTL74123(config, m_pulse2, 18000, .022E-6);  // first stage  (hooked up to 2 section of 74123)
	m_pulse2->set_connection_type(TTL74123_GROUNDED);
	m_pulse2->out_cb().set(FUNC(apple_imagewriter_printer_device::pulse2_out_handler));
	m_pulse2->set_clear_pin_value(1);