added some i/o opcodes

src/emu/cpu/amis2000/amis2000.c

@@ -5,7 +5,9 @@
   American Microsystems, Inc.(AMI) S2000-family 4-bit MCU cores, introduced late 1970s
   
   TODO:
-  - x
+  - unemulated opcodes (need more testing material)
+  - support external program map
+  - add 50/60hz timer
   - add S2200/S2400
 
 */
@@ -147,6 +149,8 @@ void amis2000_device::device_start()
 	m_e = 0;
 	m_i = 0;
 	m_k = 0;
+	m_d = 0;
+	m_a = 0;
 
 	// register for savestates
 	save_item(NAME(m_callstack));
@@ -164,6 +168,8 @@ void amis2000_device::device_start()
 	save_item(NAME(m_e));
 	save_item(NAME(m_i));
 	save_item(NAME(m_k));
+	save_item(NAME(m_d));
+	save_item(NAME(m_a));
 
 	// register state for debugger
 	state_add(S2000_PC,     "PC",     m_pc    ).formatstr("%04X");
@@ -190,6 +196,12 @@ void amis2000_device::device_reset()
 	m_pc = 0;
 	m_skip = false;
 	m_op = 0;
+	
+	// clear i/o
+	m_i = 0;
+	m_k = 0;
+	m_d = 0; m_write_d(0, 0, 0xff);
+	m_a = 0; m_write_a(0, 0, 0xffff);
 }
 
 

src/emu/cpu/amis2000/amis2000.h

@@ -91,6 +91,8 @@ protected:
 	UINT8 m_e;                  // 4-bit generic register
 	UINT8 m_i;                  // 4-bit i-pins latch
 	UINT8 m_k;                  // 4-bit k-pins latch
+	UINT8 m_d;                  // 8-bit d-pins latch
+	UINT16 m_a;                 // 13-bit a-pins latch (master strobe latch)
 
 	devcb_read8 m_read_k;
 	devcb_read8 m_read_i;

src/emu/cpu/amis2000/amis2000op.inc

@@ -187,31 +187,83 @@ void amis2000_device::op_out()
 void amis2000_device::op_disb()
 {
 	// DISB: set D-latch to ACC and RAM directly
-	op_illegal();
+	m_d = m_acc | ram_r() << 4;
+	m_write_d(0, m_d, 0xff);
+	// TODO: exit from floating mode on D-pins
 }
 
 void amis2000_device::op_disn()
 {
-	// DISN: set D-latch to ACC+carry via segment decoder
+	// DISN: set D-latch to ACC+carry via on-die segment decoder
-	op_illegal();
+	static const UINT8 lut_segment_decoder[0x10] =
+	{
+		// 0-F digits in bit order [DP]abcdefg
+		0x7e, 0x30, 0x6d, 0x79, 0x33, 0x5b, 0x5f, 0x70, 0x7f, 0x7b, 0x77, 0x1f, 0x4e, 0x3d, 0x4f, 0x47
+	};
+	m_d = lut_segment_decoder[m_acc] | (m_carry ? 0x80 : 0x00);
+	m_write_d(0, m_d, 0xff);
+	// TODO: exit from floating mode on D-pins
 }
 
 void amis2000_device::op_mvs()
 {
 	// MVS: output master strobe latch to A-pins
-	op_illegal();
+	m_write_a(0, m_a, 0xffff);
+	// TODO: enter floating mode on D-pins
 }
 
 void amis2000_device::op_psh()
 {
 	// PSH: preset high(BL) master strobe latch
-	op_illegal();
+	switch (m_bl)
+	{
+		case 0xd:
+			// set multiplex operation
+			// ?
+			break;
+
+		case 0xe:
+			// exit from floating mode on D-pins
+			// ?
+			break;
+
+		case 0xf:
+			// set all latch bits high
+			m_a = 0x1fff;
+			break;
+
+		default:
+			// set selected latch bit high
+			m_a |= (1 << m_bl);
+			break;
+	}
 }
 
 void amis2000_device::op_psl()
 {
 	// PSL: preset low(BL) master strobe latch
-	op_illegal();
+	switch (m_bl)
+	{
+		case 0xd:
+			// set static operation
+			// ?
+			break;
+
+		case 0xe:
+			// enter floating mode on D-pins
+			// ?
+			break;
+
+		case 0xf:
+			// set all latch bits low
+			m_a = 0;
+			break;
+
+		default:
+			// set selected latch bit low
+			m_a &= ~(1 << m_bl);
+			break;
+	}
 }
 
 void amis2000_device::op_eur()