pacman.cpp: changed RNG function for alibaba, fixes inp playback [Ang…

…elo Salese]

smc777.cpp: minor cleanup (nw)

src/mame/drivers/pacman.cpp

@@ -554,7 +554,10 @@ READ8_MEMBER(pacman_state::alibaba_mystery_1_r)
 {
 	/* The return value determines what the mystery item is.  Each bit corresponds
 	   to a question mark */
-	return machine().rand() & 0x0f;
+	// we use z80 R register due of a bug in rand() function (inp desyncing on playback, supposedly caused by emu/ioport.cpp line 498)
+	// it needs to be changed anyway by testing this device on real HW
+	//return machine().rand() & 0x0f;
+	return m_maincpu->state_int(Z80_R) & 0x0f;
 }
 
 

src/mame/drivers/smc777.cpp

@@ -515,7 +515,7 @@ WRITE8_MEMBER(smc777_state::system_output_w)
 	{
 		case 0x00:
 			m_raminh_pending_change = ((data & 0x10) >> 4) ^ 1;
-			m_raminh_prefetch = (uint8_t)(space.device().state().state_int(Z80_R)) & 0x7f;
+			m_raminh_prefetch = (uint8_t)(m_maincpu->state_int(Z80_R)) & 0x7f;
 			break;
 		case 0x02: printf("Interlace %s\n",data & 0x10 ? "on" : "off"); break;
 		case 0x05: m_beeper->set_state(data & 0x10); break;
@@ -571,7 +571,7 @@ READ8_MEMBER(smc777_state::smc777_mem_r)
 
 	if(m_raminh_prefetch != 0xff) //do the bankswitch AFTER that the prefetch instruction is executed (FIXME: this is an hackish implementation)
 	{
-		z80_r = (uint8_t)space.device().state().state_int(Z80_R);
+		z80_r = (uint8_t)m_maincpu->state_int(Z80_R);
 
 		if(z80_r == ((m_raminh_prefetch+2) & 0x7f))
 		{