Init cleanups and gnet fix

src/devices/cpu/mn10200/mn10200.cpp

@@ -225,6 +225,17 @@ void mn10200_device::device_start()
 		save_item(NAME(m_port[i].dir), i);
 	}
 
+	// registering reads the value, so clear it before
+	m_pc = 0;
+	m_mdr = 0;
+	m_nmicr = 0;
+	m_iagr = 0;
+	for (int i=0; i != 4; i++)
+	{
+		m_d[i] = 0;
+		m_a[i] = 0;
+	}
+
 	// register for debugger
 	state_add( MN10200_PC,    "PC",    m_pc ).mask(0xffffff).formatstr("%06X");
 	state_add( MN10200_MDR,   "MDR",   m_mdr).formatstr("%04X");

src/devices/cpu/psx/psx.cpp

@@ -1982,6 +1982,10 @@ void psxcpu_device::device_start()
 	state_add( PSXCPU_CP2CR30, "zsf4", m_gte.m_cp2cr[ 30 ].d );
 	state_add( PSXCPU_CP2CR31, "flag", m_gte.m_cp2cr[ 31 ].d );
 
+	// initialize the registers once
+	for(int i=0; i != 32; i++)
+		m_r[i] = 0;
+
 	// set our instruction counter
 	set_icountptr(m_icount);
 

src/devices/machine/ataflash.cpp

@@ -160,7 +160,7 @@ void taito_pccard1_device::write_reg(offs_t offset, uint16_t data, uint16_t mem_
 	{
 		uint8_t v = data;
 		int pos = offset - 0x280;
-		uint8_t k = pos < sizeof(m_key) ? m_key[pos] : 0;
+		uint8_t k = pos < m_key.size() ? m_key[pos] : 0;
 
 		// TODO: find out if unlocking the key then using an incorrect key will re-lock the card.
 		if (v == k)

src/mame/machine/cat702.cpp

@@ -121,6 +121,8 @@ void cat702_device::device_start()
 	m_dataout_handler.resolve_safe();
 
 	save_item(NAME(m_select));
+	save_item(NAME(m_clock));
+	save_item(NAME(m_datain));
 	save_item(NAME(m_state));
 	save_item(NAME(m_bit));