diff --git a/src/core.cpp b/src/core.cpp
index a0ce92a5..a80f6eda 100644
--- a/src/core.cpp
+++ b/src/core.cpp
@@ -62,7 +62,7 @@ void Core::step() {
 
   if (activeThreads == 0) return;
 
-  cout << "in step pc=0x" << hex << pc << '\n';
+  //cout << "in step pc=0x" << hex << pc << '\n';
 
   /* Fetch and decode. */
   if (wordSize < sizeof(pc)) pc &= ((1ll<<(wordSize*8))-1);
@@ -87,9 +87,9 @@ void Core::step() {
       interrupt(pf.notFound?1:2);
     }
   } while (fetchMore);
-  cout << "Fetched at 0x" << hex << pc << '\n';
+  //cout << "Fetched at 0x" << hex << pc << '\n';
   //cout << "0x" << hex << pc << ": " << *inst << '\n';
-  cout << "sizeof(core)=" << dec << sizeof(*this) << '\n';
+  //cout << "sizeof(core)=" << dec << sizeof(*this) << '\n';
 
 #ifdef EMU_INSTRUMENTATION
   { Addr pcPhys(mem.virtToPhys(pc));
diff --git a/src/enc.cpp b/src/enc.cpp
index 49a3e28d..4b44fc32 100644
--- a/src/enc.cpp
+++ b/src/enc.cpp
@@ -344,7 +344,7 @@ Instruction *WordDecoder::decode(const std::vector<Byte> &v, Size &idx) {
     inst.setImmRef(*r);
   }
 
-  cout << "Decoded 0x" << hex << code << " into: " << inst << '\n';
+  //cout << "Decoded 0x" << hex << code << " into: " << inst << '\n';
 
   return &inst;
 }
diff --git a/src/mem.cpp b/src/mem.cpp
index 68885683..59caef77 100644
--- a/src/mem.cpp
+++ b/src/mem.cpp
@@ -51,7 +51,8 @@ MemDevice &MemoryUnit::ADecoder::doLookup(Addr a, Size &bit) {
   if (range == 0 || (a&((1ll<<bit)-1)) >= range) {
     ADecoder *p(((a>>bit)&1)?oneChild:zeroChild);
     if (p) { bit--; return p->doLookup(a, bit); }
-    else {cout << "lookup failed.\n"; throw BadAddress();}
+    else {cout << "lookup of 0x" << hex << a << " failed.\n";
+          throw BadAddress();}
   } else {
     return *md;
   }
@@ -138,6 +139,7 @@ void MemoryUnit::write(Addr vAddr, Word w, bool sup) {
 }
 
 void MemoryUnit::tlbAdd(Addr virt, Addr phys, Word flags) {
+  cout << "tlbAdd(0x" << hex << virt << ", 0x" << phys << ", 0x" << flags << ")\n";
   tlb[virt/pageSize] = TLBEntry(phys/pageSize, flags);
 }
 
diff --git a/src/test/lib.s b/src/test/lib.s
index 9878ba30..0e9cedcf 100644
--- a/src/test/lib.s
+++ b/src/test/lib.s
@@ -15,6 +15,7 @@ printdec:    ldi %r8, #1;
        @p0 ? ldi %r6, #0x2d;
        @p0 ? st %r6, %r8, #0;
        @p0 ? neg %r7, %r7;
+             ldi %r9, #0;
 printdec_l1: modi %r6, %r7, #10;
              divi %r7, %r7, #10;
              addi %r6, %r6, #0x30;
@@ -45,6 +46,6 @@ puts_l:      ld   %r6, %r7, #0;
              jmpi puts_l;
 puts_end:    jmpr %r5
 
-.perm rw
+.perm rwx
 .word digstack 0
 .word 9