Ejemplo n.º 1
0
static void galaxian_7474_9M_2_callback(void)
{
	/* Q bar clocks the other flip-flop,
       Q is VBLANK (not visible to the CPU) */
	TTL7474_clock_w(1, TTL7474_output_comp_r(0));
	TTL7474_update(1);
}
Ejemplo n.º 2
0
static void sfx_sh_7474_callback(void)
{
	/* the Q bar is connected to the Z80's INT line.  But since INT is complemented, */
	/* we need to complement Q bar */
	cpunum_set_input_line(2, 0, !TTL7474_output_comp_r(3) ? ASSERT_LINE : CLEAR_LINE);
}
Ejemplo n.º 3
0
/* the outputs of the flip-flops are connected to the priority encoder */
static void TTL7474_2S_1_cb(void)
{
	TTL74148_input_line_w(TTL74148_3S, COIN1_PRIORITY_LINE, TTL7474_output_comp_r(TTL7474_2S_1));
	TTL74148_update(TTL74148_3S);
}