diff --git a/include/c64/charwin.c b/include/c64/charwin.c
index 22a3b1b..8f1c315 100644
--- a/include/c64/charwin.c
+++ b/include/c64/charwin.c
@@ -119,7 +119,7 @@ bool cwin_cursor_up(CharWin * win)
 
 bool cwin_cursor_down(CharWin * win)
 {
-	if (win->cy + 1 < win->cy)
+	if (win->cy + 1 < win->wy)
 	{		
 		win->cy++;
 		return true;
@@ -418,6 +418,8 @@ bool cwin_edit_char(CharWin * win, char ch)
 		
 	case 147:
 		cwin_clear(win);
+		win->cx = 0;
+		win->cy = 0;
 		return false;
 	
 	case 17:
diff --git a/include/c64/kernalio.c b/include/c64/kernalio.c
new file mode 100644
index 0000000..3e5e333
--- /dev/null
+++ b/include/c64/kernalio.c
@@ -0,0 +1,203 @@
+#include "kernalio.h"
+
+
+void krnio_setnam(const char * name)
+{
+	__asm
+	{
+		lda name
+		ora name + 1
+		beq W1
+
+		ldy	#$ff
+	L1:	iny
+		lda	(name), y
+		bne	L1
+		tya
+	W1: ldx name
+		ldy	name + 1
+		jsr	$ffbd			// setnam
+	}
+}
+
+bool krnio_open(char fnum, char device, char channel)
+{
+	__asm
+	{
+		lda	#0
+		sta accu
+		sta	accu + 1
+
+		lda	fnum
+		ldx	device
+		ldy channel		
+		jsr	$ffba			// setlfs
+		
+		jsr	$ffc0			// open
+		bcc	W1
+
+		lda	fnum
+		jsr	$ffc3			// close
+		jmp	E2
+	W1:
+		lda	#1
+		sta	accu
+	E2:
+	}
+
+}
+
+void krnio_close(char fnum)
+{
+	__asm
+	{
+		lda	fnum
+		jsr	$ffc3			// close
+	}	
+}
+
+krnioerr krnio_status(void)
+{
+	__asm
+	{
+		jsr $ffb7			// readst
+		sta accu
+		lda #0
+		sta accu + 1
+	}
+}
+
+bool krnio_chkout(char fnum)
+{
+	__asm
+	{
+		ldx fnum
+		jsr	$ffc9			// chkout
+		lda #0
+		sta accu + 1
+		bcs W1
+		lda #1
+	W1: sta accu
+	}
+}
+
+bool krnio_chkin(char fnum)
+{
+	__asm
+	{
+		ldx fnum
+		jsr	$ffc6			// chkin
+		lda #0
+		sta accu + 1
+		bcs W1
+		lda #1
+	W1: sta accu
+	}
+}
+
+void krnio_clrchn(void)
+{
+	__asm
+	{
+		jsr $ffcc		// clrchn
+	}
+}
+
+bool krnio_chrout(char ch)
+{
+		__asm
+	{
+		lda ch
+		jsr $ffd2		// chrout
+		sta accu
+		lda #0
+		sta accu + 1
+	}
+}
+
+int krnio_chrin(void)
+{
+	__asm
+	{
+		jsr $ffcf		// chrin
+		sta accu
+		jsr $ffb7
+		beq W1
+		lda #$ff
+		sta accu
+	W1: 
+		sta accu + 1
+	}
+}
+
+int krnio_getch(char fnum)
+{
+	int	ch = -1;
+	if (krnio_chkin(fnum))
+		ch = krnio_chrin();
+	krnio_clrchn();
+	return ch;
+}
+
+int krnio_puts(char fnum, const char * data)
+{
+	if (krnio_chkout(fnum))
+	{
+		int i = 0;
+		while (data[i])
+			krnio_chrout(data[i++]);
+		krnio_clrchn();
+		return i;
+	}
+	else
+		return -1;
+}
+
+int krnio_write(char fnum, const char * data, int num)
+{
+	if (krnio_chkout(fnum))
+	{
+		for(int i=0; i<num; i++)
+			krnio_chrout(data[i]);
+		krnio_clrchn();
+		return num;
+	}
+	else
+		return -1;
+}
+
+int krnio_read(char fnum, char * data, int num)
+{
+	if (krnio_chkin(fnum))
+	{
+		int i = 0;
+		int ch;
+		while (i < num && (ch = krnio_chrin()) >= 0)
+			data[i++] = (char)ch;
+		krnio_clrchn();
+		return i;
+	}
+	else
+		return -1;	
+}
+
+int krnio_gets(char fnum, char * data, int num)
+{
+	if (krnio_chkin(fnum))
+	{
+		int i = 0;
+		int ch;
+		while (i + 1 < num && (ch = krnio_chrin()) >= 0)
+		{
+			data[i++] = (char)ch;
+			if (ch == 13 || ch == 10)
+				break;
+		}
+		data[i] = 0;
+		krnio_clrchn();
+		return i;
+	}
+	else
+		return -1;	
+
+}
diff --git a/include/c64/kernalio.h b/include/c64/kernalio.h
new file mode 100644
index 0000000..edc1cfb
--- /dev/null
+++ b/include/c64/kernalio.h
@@ -0,0 +1,51 @@
+#ifndef C64_KERNALIO_H
+#ifndef C64_KERNALIO_H
+
+
+enum krnioerr
+{
+	KRNIO_OK = 0,
+	KRNIO_DIR = 0x01,
+	KRNIO_TIMEOUT = 0x02,
+	KRNIO_SHORT = 0x04,
+	KRNIO_LONG = 0x08,
+	KRNIO_VERIFY = 0x10,
+	KRNIO_CHKSUM = 0x20,
+	KRNIO_EOF = 0x40,
+	KRNIO_NODEVICE = 0x80
+};
+
+void krnio_setnam(const char * name);
+
+bool krnio_open(char fnum, char device, char channel);
+
+void krnio_close(char fnum);
+
+krnioerr krnio_status(void);
+
+
+bool krnio_chkout(char fnum);
+
+bool krnio_chkin(char fnum);
+
+void krnio_clrchn(void);
+
+bool krnio_chrout(char ch);
+
+int krnio_chrin(void);
+
+int krnio_getch(char fnum);
+
+
+
+int krnio_write(char fnum, const char * data, int num);
+
+int krnio_puts(char fnum, const char * data);
+
+int krnio_read(char fnum, char * data, int num);
+
+int krnio_gets(char fnum, char * data, int num);
+
+#pragma compile("kernalio.c")
+
+#endif
diff --git a/include/crt.c b/include/crt.c
index 8401723..6aff118 100644
--- a/include/crt.c
+++ b/include/crt.c
@@ -1885,6 +1885,22 @@ W1:		jmp	startup.yexec
 #pragma	bytecode(BC_BINOP_SHRI_I16, inp_binop_shr_s16.inp_binop_shri_s16)
 #pragma	bytecode(BC_BINOP_SHRR_I16, inp_binop_shr_s16.inp_binop_shrr_s16)
 
+__asm inp_binop_adda_16
+{
+		lda	(ip), y
+		tax
+		clc
+		lda	$00, x
+		adc	accu
+		sta $00, x
+		lda $01, x
+		adc accu + 1
+		sta $01, x
+		jmp	startup.yexec
+}
+
+#pragma	bytecode(BC_BINOP_ADDA_16, inp_binop_adda_16)
+
 __asm cmp16
 {
 inp_binop_cmpr_s16:
diff --git a/include/crt.h b/include/crt.h
index 1b4f6ba..928e476 100644
--- a/include/crt.h
+++ b/include/crt.h
@@ -76,6 +76,8 @@ enum ByteCode
 	BC_BINOP_SHRR_U16,
 	BC_BINOP_SHRR_I16,
 
+	BC_BINOP_ADDA_16,
+
 	BC_BINOP_ADDI_16,
 	BC_BINOP_SUBI_16,
 	BC_BINOP_ANDI_16,
diff --git a/include/setjmp.c b/include/setjmp.c
new file mode 100644
index 0000000..45cce53
--- /dev/null
+++ b/include/setjmp.c
@@ -0,0 +1,112 @@
+#include "setjmp.h"
+
+int setjmp(jmp_buf env)
+{
+	__asm
+	{
+		ldy	#0
+		lda __sp + 0
+		sta (env), y
+		iny
+		lda __sp + 1
+		sta (env), y
+		iny
+
+		lda __ip + 0
+		sta (env), y
+		iny
+		lda __ip + 1
+		sta (env), y
+		iny
+
+		lda __fp + 0
+		sta (env), y
+		iny
+		lda __fp + 1
+		sta (env), y
+		iny
+
+		ldx #0
+	loop:
+		lda __sregs, x
+		sta (env), y
+		iny
+		inx
+		cpx #32
+		bne loop
+
+		tsx
+		txa
+		sta (env), y
+		iny 
+
+		lda $0100, x
+		sta (env), y
+		iny
+
+		lda $0101, x
+		sta (env), y
+		iny
+	}
+
+	return 0
+}
+
+#pragma native(setjmp)
+
+void longjmp(jmp_buf env, int value)
+{
+	__asm
+	{
+		ldy	#0
+		lda (env), y
+		sta __sp + 0
+		iny
+		lda (env), y
+		sta __sp + 1
+		iny
+
+		lda (env), y
+		sta __ip + 0
+		iny
+		lda (env), y
+		sta __ip + 1
+		iny
+		
+		lda (env), y
+		sta __fp + 0
+		iny
+		lda (env), y
+		sta __fp + 1
+		iny
+		
+		ldx #0
+	loop:
+		lda (env), y
+		sta __sregs, x
+		iny
+		inx
+		cpx #32
+		bne loop
+
+		lda (env), y
+		tax
+		txs
+		iny 
+
+		lda (env), y
+		sta $0100, x
+		iny
+
+		lda (env), y
+		sta $0101, x
+		iny
+
+		lda value
+		sta __accu
+		lda value + 1
+		sta __accu + 1
+	}
+}
+
+#pragma native(longjmp)
diff --git a/include/setjmp.h b/include/setjmp.h
new file mode 100644
index 0000000..4f4cc2e
--- /dev/null
+++ b/include/setjmp.h
@@ -0,0 +1,21 @@
+#ifndef SETJMP_H
+#define SETJMP_H
+
+struct _jmp_buf
+{
+	void 	* sp, * ip, * fp;
+	char	tmps[32];
+	char	cpup, cpul, cpuh;
+};
+
+typedef struct _jmp_buf jmp_buf[1];
+
+int setjmp(jmp_buf env);
+
+void longjmp(jmp_buf env, int value);
+
+
+#pragma compile("setjmp.c")
+
+#endif
+
diff --git a/include/string.c b/include/string.c
index 25c4412..a105b31 100644
--- a/include/string.c
+++ b/include/string.c
@@ -108,6 +108,8 @@ int strlen(const char * str)
 	return i;
 }
 
+#pragma native(strlen)
+
 char * strcat(char * dst, const char * src)
 {
 	char * d = dst;
@@ -121,6 +123,17 @@ char * strcat(char * dst, const char * src)
 	return dst;
 }	
 
+#pragma native(strcat)
+
+char * cpycat(char * dst, const char * src)
+{
+	do {} while (*dst++ = *src++);
+	
+	return dst;	
+}
+
+#pragma native(cpycat)
+
 void * memset(void * dst, int value, int size)
 {
 	__asm
diff --git a/include/string.h b/include/string.h
index 75396e6..1fe3754 100644
--- a/include/string.h
+++ b/include/string.h
@@ -9,6 +9,8 @@ int strlen(const char * str);
 
 char * strcat(char * dst, const char * src);
 
+char * cpycat(char * dst, const char * src);
+
 void * memclr(void * dst, int size);
 
 void * memset(void * dst, int value, int size);
diff --git a/oscar64/ByteCodeGenerator.cpp b/oscar64/ByteCodeGenerator.cpp
index ded2bb2..0bdaeec 100644
--- a/oscar64/ByteCodeGenerator.cpp
+++ b/oscar64/ByteCodeGenerator.cpp
@@ -549,6 +549,10 @@ bool ByteCodeInstruction::CheckAccuSize(uint32 & used)
 		used |= 0x0000ffff;
 		break;
 
+	case BC_BINOP_ADDA_16:
+		used |= 0x0000ffff;
+		break;
+
 	case BC_BINOP_ADDI_16:
 		if (mRegister == BC_REG_ACCU)
 		{
@@ -730,6 +734,9 @@ bool ByteCodeInstruction::UsesRegister(uint32 reg) const
 
 		if (mCode >= BC_BINOP_ADD_L32 && mCode <= BC_BINOP_CMP_S32)
 			return true;
+
+		if (mCode == BC_BINOP_ADDA_16)
+			return true;
 	}
 
 	if (reg == BC_REG_ACCU)
@@ -759,6 +766,8 @@ bool ByteCodeInstruction::UsesRegister(uint32 reg) const
 			return true;
 		if (mCode == BC_COPY || mCode == BC_STRCPY)
 			return true;
+		if (mCode == BC_BINOP_ADDA_16)
+			return true;
 	}
 
 	if (reg == BC_REG_ADDR)
@@ -797,6 +806,8 @@ bool ByteCodeInstruction::ChangesRegister(uint32 reg) const
 			return true;
 		if (mCode == BC_CALL)
 			return true;
+		if (mCode == BC_BINOP_ADDA_16)
+			return true;
 	}
 
 	if (reg == BC_REG_ACCU)
@@ -980,6 +991,7 @@ void ByteCodeInstruction::Assemble(ByteCodeGenerator* generator, ByteCodeBasicBl
 	case BC_BINOP_SHLR_16:
 	case BC_BINOP_SHRR_U16:
 	case BC_BINOP_SHRR_I16:
+	case BC_BINOP_ADDA_16:
 		block->PutCode(generator, mCode);
 		block->PutByte(mRegister);
 		break;
@@ -4249,6 +4261,8 @@ bool ByteCodeBasicBlock::JoinTailCodeSequences(void)
 						{
 							ByteCodeBasicBlock* b = mEntryBlocks[i];
 							b->mIns.SetSize(b->mIns.Size() - 1);
+							if (mIns.Size() == 1)
+								mExitLive |= b->mExitLive;
 							b->mExitLive = LIVE_ACCU;
 						}
 						changed = true;
@@ -4779,6 +4793,29 @@ bool ByteCodeBasicBlock::PeepHoleOptimizer(int phase)
 						mIns[i + 0].mRegister = BC_REG_ACCU;
 						mIns[i + 1].mCode = BC_NOP;
 						mIns[i + 2].mCode = BC_NOP;
+						progress = true;
+					}
+					else if (
+						mIns[i + 0].mCode == BC_LOAD_REG_16 &&
+						mIns[i + 1].mCode == BC_BINOP_ADDR_16 &&
+						mIns[i + 2].mCode == BC_STORE_REG_16 && mIns[i + 0].mRegister == mIns[i + 2].mRegister && !(mIns[i + 2].mLive & LIVE_ACCU))
+					{
+						mIns[i + 0].mRegister = mIns[i + 1].mRegister;
+						mIns[i + 0].mRegisterFinal = mIns[i + 1].mRegisterFinal;
+						mIns[i + 1].mCode = BC_NOP;
+						mIns[i + 2].mCode = BC_BINOP_ADDA_16;
+						progress = true;
+					}
+					else if (
+						(mIns[i + 0].mCode == BC_LOAD_LOCAL_16 || mIns[i + 0].mCode == BC_LOAD_ABS_16 || mIns[i + 0].mCode == BC_LOAD_ADDR_16 ||
+						 mIns[i + 0].mCode == BC_LOAD_LOCAL_U8 || mIns[i + 0].mCode == BC_LOAD_ABS_U8 || mIns[i + 0].mCode == BC_LOAD_ADDR_U8) && 
+						mIns[i + 1].mCode == BC_BINOP_ADDR_16 && mIns[i + 0].mRegister == mIns[i + 1].mRegister && mIns[i + 1].mRegisterFinal &&
+						mIns[i + 2].mCode == BC_STORE_REG_16 && !(mIns[i + 2].mLive & LIVE_ACCU))
+					{
+						mIns[i + 0].mRegister = mIns[i + 2].mRegister;
+						mIns[i + 1].mCode = BC_NOP;
+						mIns[i + 2].mCode = BC_BINOP_ADDA_16;
+						progress = true;
 					}
 				}
 #endif
@@ -5037,6 +5074,24 @@ bool ByteCodeBasicBlock::PeepHoleOptimizer(int phase)
 						mIns[i + 1].mCode = BC_NOP;
 						progress = true;
 					}
+#if 1
+					else if (
+						mIns[i + 0].mCode == BC_BINOP_ADDR_16 &&
+						mIns[i + 1].mCode == BC_STORE_REG_16 && mIns[i + 0].mRegister == mIns[i + 1].mRegister && !(mIns[i + 1].mLive & LIVE_ACCU))
+					{
+						mIns[i + 1].mCode = BC_BINOP_ADDA_16;
+						mIns[i + 0].mCode = BC_NOP;
+						progress = true;
+					}
+					else if (
+						mIns[i + 0].mCode == BC_BINOP_ADDA_16 &&
+						mIns[i + 1].mCode == BC_LOAD_REG_16 && mIns[i + 0].mRegister == mIns[i + 1].mRegister && mIns[i + 1].mRegisterFinal)
+					{
+						mIns[i + 1].mCode = BC_BINOP_ADDR_16;
+						mIns[i + 0].mCode = BC_NOP;
+						progress = true;
+					}
+#endif
 #if 1
 					else if (
 						i + 2 == mIns.Size() && mFalseJump &&
@@ -5049,6 +5104,7 @@ bool ByteCodeBasicBlock::PeepHoleOptimizer(int phase)
 						mBranch = TransposeBranchCondition(mBranch);
 						progress = true;
 					}
+
 #endif
 
 #if 0
diff --git a/oscar64/ByteCodeGenerator.h b/oscar64/ByteCodeGenerator.h
index b073670..4a79f8c 100644
--- a/oscar64/ByteCodeGenerator.h
+++ b/oscar64/ByteCodeGenerator.h
@@ -77,6 +77,8 @@ enum ByteCode
 	BC_BINOP_SHRR_U16,
 	BC_BINOP_SHRR_I16,
 
+	BC_BINOP_ADDA_16,
+
 	BC_BINOP_ADDI_16,
 	BC_BINOP_SUBI_16,
 	BC_BINOP_ANDI_16,
diff --git a/oscar64/Disassembler.cpp b/oscar64/Disassembler.cpp
index fac686f..bc63685 100644
--- a/oscar64/Disassembler.cpp
+++ b/oscar64/Disassembler.cpp
@@ -246,6 +246,10 @@ void ByteCodeDisassembler::Disassemble(FILE* file, const uint8* memory, int star
 			fprintf(file, "ADD\tACCU, %s", TempName(memory[start + i + 0], tbuffer, proc));
 			i += 1;
 			break;
+		case BC_BINOP_ADDA_16:
+			fprintf(file, "ADD\t%s, ACCU", TempName(memory[start + i + 0], tbuffer, proc));
+			i += 1;
+			break;
 		case BC_BINOP_SUBR_16:
 			fprintf(file, "SUB\tACCU, %s", TempName(memory[start + i + 0], tbuffer, proc));
 			i += 1;
diff --git a/oscar64/Parser.cpp b/oscar64/Parser.cpp
index ea455f7..5a953bc 100644
--- a/oscar64/Parser.cpp
+++ b/oscar64/Parser.cpp
@@ -43,7 +43,7 @@ Declaration* Parser::ParseStructDeclaration(uint32 flags, DecType dt)
 			Declaration* pdec = mScope->Insert(structName, dec);
 			if (pdec)
 			{
-				if (pdec->mType == dt && (pdec->mFlags & DTF_DEFINED))
+				if (pdec->mType == dt && !(pdec->mFlags & DTF_DEFINED))
 				{
 					dec = pdec;
 				}
@@ -68,22 +68,22 @@ Declaration* Parser::ParseStructDeclaration(uint32 flags, DecType dt)
 		for (;;)
 		{
 			Declaration* mdec = ParseDeclaration(false);
+
+			int	offset = dec->mSize;
+			if (dt == DT_TYPE_UNION)
+				offset = 0;
+
 			while (mdec)
 			{
 				if (!(mdec->mBase->mFlags & DTF_DEFINED))
 					mErrors->Error(mdec->mLocation, EERR_UNDEFINED_OBJECT, "Undefined type used in struct member declaration");
 				mdec->mType = DT_ELEMENT;
-				if (dt == DT_TYPE_UNION)
-				{
-					mdec->mOffset = 0;
-					if (mdec->mBase->mSize > dec->mSize)
-						dec->mSize = mdec->mBase->mSize;
-				}
-				else
-				{
-					mdec->mOffset = dec->mSize;
-					dec->mSize += mdec->mBase->mSize;
-				}
+				mdec->mOffset = offset;
+
+				offset += mdec->mBase->mSize;
+				if (offset > dec->mSize)
+					dec->mSize = offset;
+
 				dec->mScope->Insert(mdec->mIdent, mdec);
 				if (mlast)
 					mlast->mNext = mdec;