diff --git a/moo/kernel/Apex.moo b/moo/kernel/Apex.moo
index 9d1e728..aef1bc3 100644
--- a/moo/kernel/Apex.moo
+++ b/moo/kernel/Apex.moo
@@ -100,6 +100,9 @@ extend Apex
 
 	method(#dual,#primitive) basicAt: index.
 	method(#dual,#primitive) basicAt: index put: value.
+	
+	##method(#dual,#primitive) basicMoveFrom: sindex length: length to: dindex.
+	##method(#dual,#primitive) basicCopyFrom: sindex length: length to: dindex.
 
 	(* ------------------------------------------------------------------
 	 * FINALIZATION SUPPORT
diff --git a/moo/kernel/Magnitu.moo b/moo/kernel/Magnitu.moo
index 6c27a5c..351b6bd 100644
--- a/moo/kernel/Magnitu.moo
+++ b/moo/kernel/Magnitu.moo
@@ -75,6 +75,32 @@ class(#limited) Character(Magnitude)
 	method(#primitive) > char.
 	method(#primitive) <= char.
 	method(#primitive) >= char.
+
+	method digitValue: anInteger
+	{
+		^'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ' at: anInteger
+	}
+
+	method digitValue
+	{
+		##<primitive: #Character_digitValue>
+
+		if (self >= $0 and: [self <= $9])
+		{
+			^self asInteger - $0 asInteger
+		}
+		elsif (self >= $A and: [self <= $Z])
+		{
+			^self asInteger - $A asInteger + 10
+		}
+		elsif (self >= $a and: [self <= $z])
+		{
+			^self asInteger - $a asInteger + 10
+		}.
+
+		##Exception signal: 'not a digit character'.
+		^-1
+	}
 }
 
 class(#limited) Number(Magnitude)
diff --git a/moo/kernel/Socket.moo b/moo/kernel/Socket.moo
index fb9c446..5916654 100644
--- a/moo/kernel/Socket.moo
+++ b/moo/kernel/Socket.moo
@@ -31,7 +31,7 @@ class(#byte) IP4Address(IPAddress)
 
 		pos := 0.
 		size := str size.
-		
+
 		acc := 0.
 		digits := 0.
 		dots := 0.
@@ -92,10 +92,111 @@ class(#byte) IP6Address(IPAddress)
 	{
 		^self basicNew: 16.
 	}
-	
+
 	method(#class) fromString: str
 	{
+		^self new fromString: str.
+	}
+
+	method __fromString: str
+	{
+		| pos size ch tgpos v1 val curtok saw_xdigit colonpos |
+
+		pos := 0.
+		size := str size.
+
+		## handle leading :: specially 
+		if (size > 0 and: [ (str at: pos) == $: ])
+		{
+			pos := pos + 1.
+			if (pos >= size or: [ (str at: pos) ~~ $:]) { ^Error.Code.EINVAL }.
+		}.
+
+		tgpos := 0.
+		curtok := pos.
+		val := 0.
+		saw_xdigit := false.
+		colonpos := -1.
+
+		while (pos < size)
+		{
+			ch := str at: pos.
+			pos := pos + 1.
+
+			v1 := ch digitValue.
+			if (v1 >= 0 and: [v1 <= 15])
+			{
+				val := (val bitShift: 4) bitOr: v1.
+				if (val > 16rFFFF) { ^Error.Code.EINVAL }.
+				saw_xdigit := true.
+				continue.
+			}.
+
+			if (ch == $:)
+			{
+				curtok := pos.
+				if (saw_xdigit not)
+				{
+					## no multiple double colons are allowed
+					if (colonpos >= 0) { ^Error.Code.EINVAL }. 
+
+					## capture the target position when the double colons 
+					## are encountered.
+					colonpos := tgpos.
+					continue.
+				}
+				elsif (pos >= size)
+				{
+					## a colon can't be the last character
+					^Error.Code.EINVAL
+				}.
+
+				self basicAt: tgpos put: ((val bitShift: -8) bitAnd: 16rFF).
+				tgpos := tgpos + 1.
+				self basicAt: tgpos put: (val bitAnd: 16rFF).
+				tgpos := tgpos + 1.
+
+				saw_xdigit := false.
+				val := 0.
+				continue.
+			}.
+
+			(*if (ch == $. and: [])
+			{
+				saw_xdigit := true.
+				break.
+			}.*)
+
+
+			## invalid character in the address
+			^Error.Code.EINVAL.
+		}.
+
+		if (saw_xdigit)
+		{
+			self basicAt: tgpos put: ((val bitShift: -8) bitAnd: 16rFF).
+			tgpos := tgpos + 1.
+			self basicAt: tgpos put: (val bitAnd: 16rFF).
+			tgpos := tgpos + 1.
+		}.
+
+		if (colonpos >= 0)
+		{
+			/* double colon position */
+			self basicMoveFrom: colonpos length: 5 to: ((self basicSize) - colonpos).
+		}.
+
+tgpos dump.
+self basicSize dump.
+		if (tgpos ~~ (self basicSize)) { 'DDDDDDDDDDDd' dump. ^Error.Code.EINVAL }.
+	}
 	
+	method fromString: str
+	{
+		if ((self __fromString: str) isError)
+		{
+			Exception signal: ('invalid IPv6 address ' & str).
+		}
 	}
 }
 
@@ -267,6 +368,10 @@ class MyObject(Object)
 s := IP4Address fromString: '192.168.123.232'.
 s dump.
 s basicSize dump.
+
+s := IP6Address fromString: 'fe80::c225:e9ff:fe47:b1b6'.
+s dump.
+s basicSize dump.
 ##s := IP6Address new.
 ##s dump.
 ##s := IP4SocketAddress new.
diff --git a/moo/lib/pf-basic.c b/moo/lib/pf-basic.c
index 2fc3e74..4ea260e 100644
--- a/moo/lib/pf-basic.c
+++ b/moo/lib/pf-basic.c
@@ -299,7 +299,7 @@ moo_pfrc_t moo_pf_basic_at (moo_t* moo, moo_ooi_t nargs)
 	if (idx >= MOO_OBJ_GET_SIZE(rcv))
 	{
 		/* index out of range */
-		moo_seterrbfmt (moo, MOO_ERANGE, "position out of bound - %O", pos);
+		moo_seterrbfmt (moo, MOO_ERANGE, "position out of bound - %zu", idx);
 		return MOO_PF_FAILURE;
 	}
 
@@ -353,7 +353,6 @@ moo_pfrc_t moo_pf_basic_at_put (moo_t* moo, moo_ooi_t nargs)
 
 	if (MOO_OBJ_GET_FLAGS_RDONLY(rcv))
 	{
-/* TODO: better error handling */
 		moo_seterrbfmt (moo, MOO_EPERM, "now allowed to change a read-only object - %O", rcv);
 		return MOO_PF_FAILURE;
 	}
@@ -370,7 +369,7 @@ moo_pfrc_t moo_pf_basic_at_put (moo_t* moo, moo_ooi_t nargs)
 	if (idx >= MOO_OBJ_GET_SIZE(rcv))
 	{
 		/* index out of range */
-		moo_seterrbfmt (moo, MOO_ERANGE, "position out of bound - %O", pos);
+		moo_seterrbfmt (moo, MOO_ERANGE, "position out of bound - %zu", idx);
 		return MOO_PF_FAILURE;
 	}
 
@@ -435,6 +434,106 @@ moo_pfrc_t moo_pf_basic_at_put (moo_t* moo, moo_ooi_t nargs)
 	return MOO_PF_SUCCESS;
 }
 
+moo_pfrc_t moo_pf_basic_move (moo_t* moo, moo_ooi_t nargs)
+{
+	moo_oop_t rcv, spos, slen, dpos;
+	moo_oow_t sidx, ssz, didx;
+
+	MOO_ASSERT (moo, nargs == 3);
+
+	rcv = MOO_STACK_GETRCV(moo, nargs);
+	if (!MOO_OOP_IS_POINTER(rcv))
+	{
+		/* the receiver is a special numeric object, not a normal pointer */
+		moo_seterrbfmt (moo, MOO_EMSGRCV, "receiver not indexable - %O", rcv);
+		return MOO_PF_FAILURE;
+	}
+
+	if (MOO_OBJ_GET_FLAGS_RDONLY(rcv))
+	{
+		moo_seterrbfmt (moo, MOO_EPERM, "now allowed to change a read-only object - %O", rcv);
+		return MOO_PF_FAILURE;
+	}
+
+	spos = MOO_STACK_GETARG(moo, nargs, 0);
+	slen = MOO_STACK_GETARG(moo, nargs, 1);
+	dpos = MOO_STACK_GETARG(moo, nargs, 2);
+
+	if (moo_inttooow(moo, spos, &sidx) <= 0)
+	{
+		/* negative integer or not integer */
+		moo_seterrbfmt (moo, MOO_EINVAL, "invalid source position - %O", spos);
+		return MOO_PF_FAILURE;
+	}
+	if (sidx >= MOO_OBJ_GET_SIZE(rcv))
+	{
+		/* index out of range */
+		moo_seterrbfmt (moo, MOO_ERANGE, "source position out of bound - %zu", sidx);
+		return MOO_PF_FAILURE;
+	}
+
+	if (moo_inttooow(moo, slen, &ssz) <= 0)
+	{
+		/* negative integer or not integer */
+		moo_seterrbfmt (moo, MOO_EINVAL, "invalid source length - %O", slen);
+		return MOO_PF_FAILURE;
+	}
+	
+	/* TODO: adjust ssz */
+
+	if (moo_inttooow(moo, dpos, &didx) <= 0)
+	{
+		/* negative integer or not integer */
+		moo_seterrbfmt (moo, MOO_EINVAL, "invalid destination position - %O", dpos);
+		return MOO_PF_FAILURE;
+	}
+	if (didx >= MOO_OBJ_GET_SIZE(rcv))
+	{
+		/* index out of range */
+		moo_seterrbfmt (moo, MOO_ERANGE, "destination position out of bound - %zu", didx);
+		return MOO_PF_FAILURE;
+	}
+
+	switch (MOO_OBJ_GET_FLAGS_TYPE(rcv))
+	{
+		case MOO_OBJ_TYPE_BYTE:
+			MOO_MEMMOVE (&((moo_oop_byte_t)rcv)->slot[didx],
+			             &((moo_oop_byte_t)rcv)->slot[sidx],
+			             ssz * MOO_SIZEOF(((moo_oop_byte_t)rcv)->slot[0]));
+			break;
+
+		case MOO_OBJ_TYPE_CHAR:
+			MOO_MEMMOVE (&((moo_oop_char_t)rcv)->slot[didx],
+			             &((moo_oop_char_t)rcv)->slot[sidx],
+			             ssz * MOO_SIZEOF(((moo_oop_char_t)rcv)->slot[0]));
+			break;
+
+		case MOO_OBJ_TYPE_HALFWORD:
+			MOO_MEMMOVE (&((moo_oop_halfword_t)rcv)->slot[didx],
+			             &((moo_oop_halfword_t)rcv)->slot[sidx],
+			             ssz * MOO_SIZEOF(((moo_oop_halfword_t)rcv)->slot[0]));
+			break;
+
+		case MOO_OBJ_TYPE_WORD:
+			MOO_MEMMOVE (&((moo_oop_word_t)rcv)->slot[didx],
+			             &((moo_oop_word_t)rcv)->slot[sidx],
+			             ssz * MOO_SIZEOF(((moo_oop_word_t)rcv)->slot[0]));
+			break;
+
+		case MOO_OBJ_TYPE_OOP:
+			MOO_MEMMOVE (&((moo_oop_oop_t)rcv)->slot[didx],
+			             &((moo_oop_oop_t)rcv)->slot[sidx],
+			             ssz * MOO_SIZEOF(((moo_oop_oop_t)rcv)->slot[0]));
+			break;
+
+		default:
+			moo_seterrnum (moo, MOO_EINTERN);
+			return MOO_PF_HARD_FAILURE;
+	}
+
+	MOO_STACK_SETRETTORCV (moo, nargs);
+	return MOO_PF_SUCCESS;
+}
 
 /* -------------------------------------------------------------------------------- 
  * BASIC QUERY