added jump opcodes

src/emu/cpu/amis2000/amis2000.c

@@ -134,6 +134,9 @@ void amis2000_device::device_start()
 	// zerofill
 	memset(m_callstack, 0, sizeof(m_callstack));
 	m_pc = 0;
+	m_ppr = 0;
+	m_pbr = 0;
+	m_pp_index = 0;
 	m_skip = false;
 	m_op = 0;
 	m_f = 0;
@@ -148,6 +151,9 @@ void amis2000_device::device_start()
 	// register for savestates
 	save_item(NAME(m_callstack));
 	save_item(NAME(m_pc));
+	save_item(NAME(m_ppr));
+	save_item(NAME(m_pbr));
+	save_item(NAME(m_pp_index));
 	save_item(NAME(m_skip));
 	save_item(NAME(m_op));
 	save_item(NAME(m_f));
@@ -182,6 +188,8 @@ void amis2000_device::device_start()
 void amis2000_device::device_reset()
 {
 	m_pc = 0;
+	m_skip = false;
+	m_op = 0;
 }
 
 
@@ -198,6 +206,15 @@ void amis2000_device::execute_run()
 	{
 		m_icount--;
 		
+		// increase PP prefix count
+		if ((m_op & 0xf0) == 0x60)
+		{
+			if (m_pp_index < 2)
+				m_pp_index++;
+		}
+		else
+			m_pp_index = 0;
+
 		debugger_instruction_hook(this, m_pc);
 		m_op = m_program->read_byte(m_pc);
 		m_pc = (m_pc + 1) & 0x1fff;

src/emu/cpu/amis2000/amis2000.h

@@ -72,13 +72,16 @@ protected:
 	
 	UINT8 m_bu_bits;
 	UINT16 m_bu_mask;
-	UINT8 m_callstack_bits;
+	UINT8 m_callstack_bits;     // number of program counter bits held in callstack
 	UINT16 m_callstack_mask;
 	UINT8 m_callstack_depth;    // callstack levels: 3 on 2000/2150, 5 on 2200/2400
 	UINT16 m_callstack[5];      // max 5
 
-	UINT16 m_pc;
-	bool m_skip;
+	UINT16 m_pc;                // 13-bit program counter
+	UINT8 m_ppr;                // prepared page register (PP 1)
+	UINT8 m_pbr;                // prepared bank register (PP 2)
+	UINT8 m_pp_index;           // number of handled PP prefixes
+	bool m_skip;                // skip next opcode, including PP prefixes
 	UINT8 m_op;
 	UINT8 m_f;                  // generic flags: 2 on 2000/2150, 6 on 2200/2400
 	UINT8 m_carry;              // carry flag
@@ -99,6 +102,8 @@ protected:
 	
 	UINT8 ram_r();
 	void ram_w(UINT8 data);
+	void pop_callstack();
+	void push_callstack();
 	void op_illegal();
 	
 	void op_lai();

src/emu/cpu/amis2000/amis2000op.inc

@@ -14,6 +14,25 @@ void amis2000_device::ram_w(UINT8 data)
 	m_data->write_byte(address, data & 0xf);
 }
 
+void amis2000_device::pop_callstack()
+{
+	m_pc = (m_pc & ~m_callstack_mask) | (m_callstack[0] & m_callstack_mask);
+	for (int i = 0; i < m_callstack_depth-1; i++)
+	{
+		m_callstack[i] = m_callstack[i+1];
+		m_callstack[i+1] = 0;
+	}
+}
+
+void amis2000_device::push_callstack()
+{
+	for (int i = m_callstack_depth-1; i >= 1; i--)
+	{
+		m_callstack[i] = m_callstack[i-1];
+	}
+	m_callstack[0] = m_pc & m_callstack_mask;
+}
+
 void amis2000_device::op_illegal()
 {
 	logerror("%s unknown opcode $%02X at $%04X\n", tag(), m_op, m_pc);
@@ -207,31 +226,56 @@ void amis2000_device::op_eur()
 void amis2000_device::op_pp()
 {
 	// PP _X: prepare page/bank with _X
-	op_illegal();
+	UINT8 param = ~m_op & 0x0f;
+	if (m_pp_index == 0)
+		m_ppr = param;
+	else
+		m_pbr = param & 7;
 }
 
 void amis2000_device::op_jmp()
 {
 	// JMP X: jump to X(+PP)
-	op_illegal();
+	UINT16 mask = 0x3f;
+	UINT16 param = m_op & mask;
+	if (m_pp_index > 0)
+	{
+		param |= m_ppr << 6;
+		mask |= 0x3c0;
+	}
+	if (m_pp_index > 1)
+	{
+		param |= m_pbr << 10;
+		mask |= 0x1c00;
+	}
+	m_pc = (m_pc & ~mask) | param;
 }
 
 void amis2000_device::op_jms()
 {
 	// JMS X: call to X(+PP)
-	op_illegal();
+	m_icount--;
+	push_callstack();
+	if (m_pp_index == 0)
+	{
+		// subroutines default location is page 15
+		m_ppr = 0xf;
+		m_pp_index++;
+	}
+	op_jmp();
 }
 
 void amis2000_device::op_rt()
 {
 	// RT: return from subroutine
-	op_illegal();
+	pop_callstack();
 }
 
 void amis2000_device::op_rts()
 {
 	// RTS: return from subroutine and skip next
-	op_illegal();
+	op_rt();
+	m_skip = true;
 }
 
 void amis2000_device::op_nop()