diff --git a/ssc/binary.cs b/ssc/binary.cs
index eaf5d6d..f475837 100644
--- a/ssc/binary.cs
+++ b/ssc/binary.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics;
 using System.IO;
 using System.Collections.Generic;
 using System.Text;
@@ -75,159 +76,292 @@ namespace arookas {
 				case 0: WriteINT0(); return;
 				case 1: WriteINT1(); return;
 			}
+#if DEBUG
+			TraceInstruction("int {0} # ${0:X}", value);
+#endif
 			mText.Writer.Write8(0x00);
 			mText.Writer.WriteS32(value);
 		}
 		public void WriteFLT(float value) {
+#if DEBUG
+			TraceInstruction("flt {0}", value);
+#endif
 			mText.Writer.Write8(0x01);
 			mText.Writer.WriteF32(value);
 		}
 		public void WriteSTR(int index) {
+#if DEBUG
+			TraceInstruction("str {0}", index);
+#endif
 			mText.Writer.Write8(0x02);
 			mText.Writer.WriteS32(index);
 		}
 		public void WriteADR(uint value) {
+#if DEBUG
+			TraceInstruction("adr ${0:X8}", value);
+#endif
 			mText.Writer.Write8(0x03);
 			mText.Writer.Write32(value);
 		}
 		public void WriteVAR(int display, int index) {
+#if DEBUG
+			TraceInstruction("var {0} {1}", display, index);
+#endif
 			mText.Writer.Write8(0x04);
 			mText.Writer.WriteS32(display);
 			mText.Writer.WriteS32(index);
 		}
 		public void WriteNOP() {
+#if DEBUG
+			TraceInstruction("nop");
+#endif
 			mText.Writer.Write8(0x05);
 		}
 		public void WriteINC(int display, int index) {
+#if DEBUG
+			TraceInstruction("inc {0} {1}", display, index);
+#endif
 			mText.Writer.Write8(0x06);
 			mText.Writer.WriteS32(display);
 			mText.Writer.WriteS32(index);
 		}
 		public void WriteDEC(int display, int index) {
+#if DEBUG
+			TraceInstruction("dec {0} {1}", display, index);
+#endif
 			mText.Writer.Write8(0x07);
 			mText.Writer.WriteS32(display);
 			mText.Writer.WriteS32(index);
 		}
 		public void WriteADD() {
+#if DEBUG
+			TraceInstruction("add");
+#endif
 			mText.Writer.Write8(0x08);
 		}
 		public void WriteSUB() {
+#if DEBUG
+			TraceInstruction("sub");
+#endif
 			mText.Writer.Write8(0x09);
 		}
 		public void WriteMUL() {
+#if DEBUG
+			TraceInstruction("mul");
+#endif
 			mText.Writer.Write8(0x0A);
 		}
 		public void WriteDIV() {
+#if DEBUG
+			TraceInstruction("div");
+#endif
 			mText.Writer.Write8(0x0B);
 		}
 		public void WriteMOD() {
+#if DEBUG
+			TraceInstruction("mod");
+#endif
 			mText.Writer.Write8(0x0C);
 		}
 		public void WriteASS(int display, int index) {
+#if DEBUG
+			TraceInstruction("ass {0} {1}", display, index);
+#endif
 			mText.Writer.Write8(0x0D);
 			mText.Writer.Write8(0x04); // unused (skipped over by TSpcInterp)
 			mText.Writer.WriteS32(display);
 			mText.Writer.WriteS32(index);
 		}
 		public void WriteEQ() {
+#if DEBUG
+			TraceInstruction("eq");
+#endif
 			mText.Writer.Write8(0x0E);
 		}
 		public void WriteNE() {
+#if DEBUG
+			TraceInstruction("ne");
+#endif
 			mText.Writer.Write8(0x0F);
 		}
 		public void WriteGT() {
+#if DEBUG
+			TraceInstruction("gt");
+#endif
 			mText.Writer.Write8(0x10);
 		}
 		public void WriteLT() {
+#if DEBUG
+			TraceInstruction("lt");
+#endif
 			mText.Writer.Write8(0x11);
 		}
 		public void WriteGE() {
+#if DEBUG
+			TraceInstruction("ge");
+#endif
 			mText.Writer.Write8(0x12);
 		}
 		public void WriteLE() {
+#if DEBUG
+			TraceInstruction("le");
+#endif
 			mText.Writer.Write8(0x13);
 		}
 		public void WriteNEG() {
+#if DEBUG
+			TraceInstruction("neg");
+#endif
 			mText.Writer.Write8(0x14);
 		}
 		public void WriteNOT() {
+#if DEBUG
+			TraceInstruction("not");
+#endif
 			mText.Writer.Write8(0x15);
 		}
 		public void WriteAND() {
+#if DEBUG
+			TraceInstruction("and");
+#endif
 			mText.Writer.Write8(0x16);
 		}
 		public void WriteOR() {
+#if DEBUG
+			TraceInstruction("or");
+#endif
 			mText.Writer.Write8(0x17);
 		}
 		public void WriteBAND() {
+#if DEBUG
+			TraceInstruction("band");
+#endif
 			mText.Writer.Write8(0x18);
 		}
 		public void WriteBOR() {
+#if DEBUG
+			TraceInstruction("bor");
+#endif
 			mText.Writer.Write8(0x19);
 		}
 		public void WriteSHL() {
+#if DEBUG
+			TraceInstruction("shl");
+#endif
 			mText.Writer.Write8(0x1A);
 		}
 		public void WriteSHR() {
+#if DEBUG
+			TraceInstruction("shr");
+#endif
 			mText.Writer.Write8(0x1B);
 		}
 		public void WriteCALL(uint offset, int count) {
+#if DEBUG
+			TraceInstruction("call ${0:X8} {1}", offset, count);
+#endif
 			mText.Writer.Write8(0x1C);
 			mText.Writer.Write32(offset);
 			mText.Writer.WriteS32(count);
 		}
 		public void WriteFUNC(int index, int count) {
+#if DEBUG
+			TraceInstruction("func {0} {1}", index, count);
+#endif
 			mText.Writer.Write8(0x1D);
 			mText.Writer.WriteS32(index);
 			mText.Writer.WriteS32(count);
 		}
 		public void WriteMKFR(int count) {
+#if DEBUG
+			TraceInstruction("mkfr {0}", count);
+#endif
 			mText.Writer.Write8(0x1E);
 			mText.Writer.WriteS32(count);
 		}
 		public void WriteMKDS(int display) {
+#if DEBUG
+			TraceInstruction("mkds {0}", display);
+#endif
 			mText.Writer.Write8(0x1F);
 			mText.Writer.WriteS32(display);
 		}
 		public void WriteRET() {
+#if DEBUG
+			TraceInstruction("ret");
+#endif
 			mText.Writer.Write8(0x20);
 		}
 		public void WriteRET0() {
+#if DEBUG
+			TraceInstruction("ret0");
+#endif
 			mText.Writer.Write8(0x21);
 		}
 		public sunPoint WriteJNE() {
+#if DEBUG
+			TraceInstruction("jne # UNFINISHED");
+#endif
 			mText.Writer.Write8(0x22);
 			sunPoint point = OpenPoint();
 			mText.Writer.Write32(0); // dummy
 			return point;
 		}
 		public void WriteJNE(sunPoint point) {
+#if DEBUG
+			TraceInstruction("jne {0:X8}", point.Offset);
+#endif
 			mText.Writer.Write8(0x22);
 			mText.Writer.Write32(point.Offset);
 		}
 		public sunPoint WriteJMP() {
+#if DEBUG
+			TraceInstruction("jmp # UNFINISHED");
+#endif
 			mText.Writer.Write8(0x23);
 			sunPoint point = OpenPoint();
 			mText.Writer.Write32(0); // dummy
 			return point;
 		}
 		public void WriteJMP(sunPoint point) {
+#if DEBUG
+			TraceInstruction("jmp {0:X8}", point.Offset);
+#endif
 			mText.Writer.Write8(0x23);
 			mText.Writer.Write32(point.Offset);
 		}
 		public void WritePOP() {
+#if DEBUG
+			TraceInstruction("pop");
+#endif
 			mText.Writer.Write8(0x24);
 		}
 		public void WriteINT0() {
+#if DEBUG
+			TraceInstruction("int0");
+#endif
 			mText.Writer.Write8(0x25);
 		}
 		public void WriteINT1() {
+#if DEBUG
+			TraceInstruction("int1");
+#endif
 			mText.Writer.Write8(0x26);
 		}
 		public void WriteEND() {
+#if DEBUG
+			TraceInstruction("end");
+#endif
 			mText.Writer.Write8(0x27);
 		}
 
+#if DEBUG
+		void TraceInstruction(string format, params object[] args) {
+			var instruction = String.Format(format, args);
+			Debug.WriteLine("{0:X8} {1}", mText.Size, instruction);
+		}
+#endif
+
 		// data
 		public void WriteData(string data) {
 			if (data == null) {