diff --git a/stella/src/yacc/Makefile.yacc b/stella/src/yacc/Makefile.yacc
index 506614706..4319a6888 100644
--- a/stella/src/yacc/Makefile.yacc
+++ b/stella/src/yacc/Makefile.yacc
@@ -3,8 +3,7 @@
 
 # can use "yacc" instead of "bison -y"
 
-all: stella.y stella.l
-	flex stella.l
+all: stella.y
 	bison -y -d stella.y
 
 
diff --git a/stella/src/yacc/stella.y b/stella/src/yacc/stella.y
index b29d6a040..e14e3ce25 100644
--- a/stella/src/yacc/stella.y
+++ b/stella/src/yacc/stella.y
@@ -5,12 +5,16 @@ Expression* lastExp = 0;
 
 #define YYERROR_VERBOSE 1
 
+/* dump Expression stack during parsing? */
+#define DEBUG_EXP 0
+/* #define DEBUG_EXP 1 */
+
 int yylex();
 char *yytext;
 
 void yyerror(char *e) {
-	//fprintf(stderr, "%s at token \"%s\"\n", e, yytext);
-	fprintf(stderr, "%s\n", e);
+	//if(DEBUG_EXP) fprintf(stderr, "%s at token \"%s\"\n", e, yytext);
+	if(DEBUG_EXP) fprintf(stderr, "%s\n", e);
 	errMsg = e;
 
 	// be extra paranoid about deletion
@@ -58,41 +62,41 @@ void yyerror(char *e) {
 
 
 %%
-statement:	expression { fprintf(stderr, "\ndone\n"); result.exp = $1; }
+statement:	expression { if(DEBUG_EXP) fprintf(stderr, "\ndone\n"); result.exp = $1; }
 	;
 
-expression:	expression '+' expression { fprintf(stderr, " +"); $$ = new PlusExpression($1, $3); lastExp = $$; }
-	|	expression '-' expression { fprintf(stderr, " -"); $$ = new MinusExpression($1, $3); lastExp = $$; }
-	|	expression '*' expression { fprintf(stderr, " *"); $$ = new MultExpression($1, $3); lastExp = $$; }
-	|	expression '/' expression { fprintf(stderr, " /"); $$ = new DivExpression($1, $3); lastExp = $$; }
-	|	expression '%' expression { fprintf(stderr, " %%"); $$ = new ModExpression($1, $3);  lastExp = $$; }
-	|	expression '&' expression { fprintf(stderr, " &"); $$ = new BinAndExpression($1, $3); lastExp = $$; }
-	|	expression '|' expression { fprintf(stderr, " |"); $$ = new BinOrExpression($1, $3); lastExp = $$; }
-	|	expression '^' expression { fprintf(stderr, " ^"); $$ = new BinXorExpression($1, $3); lastExp = $$; }
-	|	expression '<' expression { fprintf(stderr, " <"); $$ = new LessExpression($1, $3); lastExp = $$; }
-	|	expression '>' expression { fprintf(stderr, " >"); $$ = new GreaterExpression($1, $3); lastExp = $$; }
-	|	expression GTE expression { fprintf(stderr, " >="); $$ = new GreaterEqualsExpression($1, $3); lastExp = $$; }
-	|	expression LTE expression { fprintf(stderr, " <="); $$ = new LessEqualsExpression($1, $3); lastExp = $$; }
-	|	expression NE  expression { fprintf(stderr, " !="); $$ = new NotEqualsExpression($1, $3); lastExp = $$; }
-	|	expression EQ  expression { fprintf(stderr, " =="); $$ = new EqualsExpression($1, $3); lastExp = $$; }
-	|	expression SHR expression { fprintf(stderr, " >>"); $$ = new ShiftRightExpression($1, $3); lastExp = $$; }
-	|	expression SHL expression { fprintf(stderr, " <<"); $$ = new ShiftLeftExpression($1, $3); lastExp = $$; }
-	|	expression LOG_OR expression { fprintf(stderr, " ||"); $$ = new LogOrExpression($1, $3); lastExp = $$; }
-	|	expression LOG_AND expression { fprintf(stderr, " &&"); $$ = new LogAndExpression($1, $3); lastExp = $$; }
-	|	'-' expression %prec UMINUS	{ fprintf(stderr, " U-"); $$ = new UnaryMinusExpression($2); lastExp = $$; }
-	|	'~' expression %prec UMINUS	{ fprintf(stderr, " ~"); $$ = new BinNotExpression($2); lastExp = $$; }
-	|	'!' expression %prec UMINUS	{ fprintf(stderr, " !"); $$ = new LogNotExpression($2); lastExp = $$; }
-	|	'*' expression %prec DEREF { fprintf(stderr, " U*"); $$ = new ByteDerefExpression($2); lastExp = $$; }
-	|	'@' expression %prec DEREF { fprintf(stderr, " U@"); $$ = new WordDerefExpression($2); lastExp = $$; }
-	|	'<' expression { fprintf(stderr, " U<");  $$ = new LoByteExpression($2);  lastExp = $$; }
-	|	'>' expression { fprintf(stderr, " U>");  $$ = new HiByteExpression($2);  lastExp = $$; }
-	|	'(' expression ')'	{ fprintf(stderr, " ()"); $$ = $2; lastExp = $$; }
-	|	expression '[' expression ']' { fprintf(stderr, " []"); $$ = new ByteDerefOffsetExpression($1, $3); lastExp = $$; }
-	|	NUMBER { fprintf(stderr, " %d", $1); $$ = new ConstExpression($1); lastExp = $$; }
-	|	EQUATE { fprintf(stderr, " %s", $1); $$ = new EquateExpression($1); lastExp = $$; }
-	|	CPU_METHOD { fprintf(stderr, " (CpuMethod)"); $$ = new CpuMethodExpression($1); lastExp = $$; }
-	|	TIA_METHOD { fprintf(stderr, " (TiaMethod)"); $$ = new TiaMethodExpression($1); lastExp = $$; }
-	|	FUNCTION { fprintf(stderr, " (function)"); $$ = new FunctionExpression($1); lastExp = $$; }
-	|  ERR { fprintf(stderr, " ERR"); yyerror("Invalid label or constant"); return 1; }
+expression:	expression '+' expression { if(DEBUG_EXP) fprintf(stderr, " +"); $$ = new PlusExpression($1, $3); lastExp = $$; }
+	|	expression '-' expression { if(DEBUG_EXP) fprintf(stderr, " -"); $$ = new MinusExpression($1, $3); lastExp = $$; }
+	|	expression '*' expression { if(DEBUG_EXP) fprintf(stderr, " *"); $$ = new MultExpression($1, $3); lastExp = $$; }
+	|	expression '/' expression { if(DEBUG_EXP) fprintf(stderr, " /"); $$ = new DivExpression($1, $3); lastExp = $$; }
+	|	expression '%' expression { if(DEBUG_EXP) fprintf(stderr, " %%"); $$ = new ModExpression($1, $3);  lastExp = $$; }
+	|	expression '&' expression { if(DEBUG_EXP) fprintf(stderr, " &"); $$ = new BinAndExpression($1, $3); lastExp = $$; }
+	|	expression '|' expression { if(DEBUG_EXP) fprintf(stderr, " |"); $$ = new BinOrExpression($1, $3); lastExp = $$; }
+	|	expression '^' expression { if(DEBUG_EXP) fprintf(stderr, " ^"); $$ = new BinXorExpression($1, $3); lastExp = $$; }
+	|	expression '<' expression { if(DEBUG_EXP) fprintf(stderr, " <"); $$ = new LessExpression($1, $3); lastExp = $$; }
+	|	expression '>' expression { if(DEBUG_EXP) fprintf(stderr, " >"); $$ = new GreaterExpression($1, $3); lastExp = $$; }
+	|	expression GTE expression { if(DEBUG_EXP) fprintf(stderr, " >="); $$ = new GreaterEqualsExpression($1, $3); lastExp = $$; }
+	|	expression LTE expression { if(DEBUG_EXP) fprintf(stderr, " <="); $$ = new LessEqualsExpression($1, $3); lastExp = $$; }
+	|	expression NE  expression { if(DEBUG_EXP) fprintf(stderr, " !="); $$ = new NotEqualsExpression($1, $3); lastExp = $$; }
+	|	expression EQ  expression { if(DEBUG_EXP) fprintf(stderr, " =="); $$ = new EqualsExpression($1, $3); lastExp = $$; }
+	|	expression SHR expression { if(DEBUG_EXP) fprintf(stderr, " >>"); $$ = new ShiftRightExpression($1, $3); lastExp = $$; }
+	|	expression SHL expression { if(DEBUG_EXP) fprintf(stderr, " <<"); $$ = new ShiftLeftExpression($1, $3); lastExp = $$; }
+	|	expression LOG_OR expression { if(DEBUG_EXP) fprintf(stderr, " ||"); $$ = new LogOrExpression($1, $3); lastExp = $$; }
+	|	expression LOG_AND expression { if(DEBUG_EXP) fprintf(stderr, " &&"); $$ = new LogAndExpression($1, $3); lastExp = $$; }
+	|	'-' expression %prec UMINUS	{ if(DEBUG_EXP) fprintf(stderr, " U-"); $$ = new UnaryMinusExpression($2); lastExp = $$; }
+	|	'~' expression %prec UMINUS	{ if(DEBUG_EXP) fprintf(stderr, " ~"); $$ = new BinNotExpression($2); lastExp = $$; }
+	|	'!' expression %prec UMINUS	{ if(DEBUG_EXP) fprintf(stderr, " !"); $$ = new LogNotExpression($2); lastExp = $$; }
+	|	'*' expression %prec DEREF { if(DEBUG_EXP) fprintf(stderr, " U*"); $$ = new ByteDerefExpression($2); lastExp = $$; }
+	|	'@' expression %prec DEREF { if(DEBUG_EXP) fprintf(stderr, " U@"); $$ = new WordDerefExpression($2); lastExp = $$; }
+	|	'<' expression { if(DEBUG_EXP) fprintf(stderr, " U<");  $$ = new LoByteExpression($2);  lastExp = $$; }
+	|	'>' expression { if(DEBUG_EXP) fprintf(stderr, " U>");  $$ = new HiByteExpression($2);  lastExp = $$; }
+	|	'(' expression ')'	{ if(DEBUG_EXP) fprintf(stderr, " ()"); $$ = $2; lastExp = $$; }
+	|	expression '[' expression ']' { if(DEBUG_EXP) fprintf(stderr, " []"); $$ = new ByteDerefOffsetExpression($1, $3); lastExp = $$; }
+	|	NUMBER { if(DEBUG_EXP) fprintf(stderr, " %d", $1); $$ = new ConstExpression($1); lastExp = $$; }
+	|	EQUATE { if(DEBUG_EXP) fprintf(stderr, " %s", $1); $$ = new EquateExpression($1); lastExp = $$; }
+	|	CPU_METHOD { if(DEBUG_EXP) fprintf(stderr, " (CpuMethod)"); $$ = new CpuMethodExpression($1); lastExp = $$; }
+	|	TIA_METHOD { if(DEBUG_EXP) fprintf(stderr, " (TiaMethod)"); $$ = new TiaMethodExpression($1); lastExp = $$; }
+	|	FUNCTION { if(DEBUG_EXP) fprintf(stderr, " (function)"); $$ = new FunctionExpression($1); lastExp = $$; }
+	|  ERR { if(DEBUG_EXP) fprintf(stderr, " ERR"); yyerror("Invalid label or constant"); return 1; }
 	;
 %%
diff --git a/stella/src/yacc/y.tab.c b/stella/src/yacc/y.tab.c
index 02f2c7f72..f3c8d2459 100644
--- a/stella/src/yacc/y.tab.c
+++ b/stella/src/yacc/y.tab.c
@@ -29,12 +29,16 @@ Expression* lastExp = 0;
 
 #define YYERROR_VERBOSE 1
 
+/* dump Expression stack during parsing? */
+#define DEBUG_EXP 0
+/* #define DEBUG_EXP 1 */
+
 int yylex();
 char *yytext;
 
 void yyerror(char *e) {
-	//fprintf(stderr, "%s at token \"%s\"\n", e, yytext);
-	fprintf(stderr, "%s\n", e);
+	//if(DEBUG_EXP) fprintf(stderr, "%s at token \"%s\"\n", e, yytext);
+	if(DEBUG_EXP) fprintf(stderr, "%s\n", e);
 	errMsg = e;
 
 	// be extra paranoid about deletion
@@ -45,7 +49,7 @@ void yyerror(char *e) {
 }
 
 
-#line 25 "stella.y"
+#line 29 "stella.y"
 #ifndef YYSTYPE
 typedef union {
 	int val;
@@ -134,10 +138,10 @@ static const short yyrhs[] =
 /* YYRLINE[YYN] -- source line where rule number YYN was defined. */
 static const short yyrline[] =
 {
-       0,    61,    64,    65,    66,    67,    68,    69,    70,    71,
-      72,    73,    74,    75,    76,    77,    78,    79,    80,    81,
-      82,    83,    84,    85,    86,    87,    88,    89,    90,    91,
-      92,    93,    94,    95,    96
+       0,    65,    68,    69,    70,    71,    72,    73,    74,    75,
+      76,    77,    78,    79,    80,    81,    82,    83,    84,    85,
+      86,    87,    88,    89,    90,    91,    92,    93,    94,    95,
+      96,    97,    98,    99,   100
 };
 #endif
 
@@ -973,140 +977,140 @@ yyreduce:
   switch (yyn) {
 
 case 1:
-#line 61 "stella.y"
-{ fprintf(stderr, "\ndone\n"); result.exp = yyvsp[0].exp; }
+#line 65 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, "\ndone\n"); result.exp = yyvsp[0].exp; }
     break;
 case 2:
-#line 64 "stella.y"
-{ fprintf(stderr, " +"); yyval.exp = new PlusExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 68 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " +"); yyval.exp = new PlusExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 3:
-#line 65 "stella.y"
-{ fprintf(stderr, " -"); yyval.exp = new MinusExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 69 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " -"); yyval.exp = new MinusExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 4:
-#line 66 "stella.y"
-{ fprintf(stderr, " *"); yyval.exp = new MultExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 70 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " *"); yyval.exp = new MultExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 5:
-#line 67 "stella.y"
-{ fprintf(stderr, " /"); yyval.exp = new DivExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 71 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " /"); yyval.exp = new DivExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 6:
-#line 68 "stella.y"
-{ fprintf(stderr, " %%"); yyval.exp = new ModExpression(yyvsp[-2].exp, yyvsp[0].exp);  lastExp = yyval.exp; }
+#line 72 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " %%"); yyval.exp = new ModExpression(yyvsp[-2].exp, yyvsp[0].exp);  lastExp = yyval.exp; }
     break;
 case 7:
-#line 69 "stella.y"
-{ fprintf(stderr, " &"); yyval.exp = new BinAndExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 73 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " &"); yyval.exp = new BinAndExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 8:
-#line 70 "stella.y"
-{ fprintf(stderr, " |"); yyval.exp = new BinOrExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 74 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " |"); yyval.exp = new BinOrExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 9:
-#line 71 "stella.y"
-{ fprintf(stderr, " ^"); yyval.exp = new BinXorExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 75 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " ^"); yyval.exp = new BinXorExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 10:
-#line 72 "stella.y"
-{ fprintf(stderr, " <"); yyval.exp = new LessExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 76 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " <"); yyval.exp = new LessExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 11:
-#line 73 "stella.y"
-{ fprintf(stderr, " >"); yyval.exp = new GreaterExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 77 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " >"); yyval.exp = new GreaterExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 12:
-#line 74 "stella.y"
-{ fprintf(stderr, " >="); yyval.exp = new GreaterEqualsExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 78 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " >="); yyval.exp = new GreaterEqualsExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 13:
-#line 75 "stella.y"
-{ fprintf(stderr, " <="); yyval.exp = new LessEqualsExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 79 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " <="); yyval.exp = new LessEqualsExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 14:
-#line 76 "stella.y"
-{ fprintf(stderr, " !="); yyval.exp = new NotEqualsExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 80 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " !="); yyval.exp = new NotEqualsExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 15:
-#line 77 "stella.y"
-{ fprintf(stderr, " =="); yyval.exp = new EqualsExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 81 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " =="); yyval.exp = new EqualsExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 16:
-#line 78 "stella.y"
-{ fprintf(stderr, " >>"); yyval.exp = new ShiftRightExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 82 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " >>"); yyval.exp = new ShiftRightExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 17:
-#line 79 "stella.y"
-{ fprintf(stderr, " <<"); yyval.exp = new ShiftLeftExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 83 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " <<"); yyval.exp = new ShiftLeftExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 18:
-#line 80 "stella.y"
-{ fprintf(stderr, " ||"); yyval.exp = new LogOrExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 84 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " ||"); yyval.exp = new LogOrExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 19:
-#line 81 "stella.y"
-{ fprintf(stderr, " &&"); yyval.exp = new LogAndExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
+#line 85 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " &&"); yyval.exp = new LogAndExpression(yyvsp[-2].exp, yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 20:
-#line 82 "stella.y"
-{ fprintf(stderr, " U-"); yyval.exp = new UnaryMinusExpression(yyvsp[0].exp); lastExp = yyval.exp; }
+#line 86 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " U-"); yyval.exp = new UnaryMinusExpression(yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 21:
-#line 83 "stella.y"
-{ fprintf(stderr, " ~"); yyval.exp = new BinNotExpression(yyvsp[0].exp); lastExp = yyval.exp; }
+#line 87 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " ~"); yyval.exp = new BinNotExpression(yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 22:
-#line 84 "stella.y"
-{ fprintf(stderr, " !"); yyval.exp = new LogNotExpression(yyvsp[0].exp); lastExp = yyval.exp; }
+#line 88 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " !"); yyval.exp = new LogNotExpression(yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 23:
-#line 85 "stella.y"
-{ fprintf(stderr, " U*"); yyval.exp = new ByteDerefExpression(yyvsp[0].exp); lastExp = yyval.exp; }
+#line 89 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " U*"); yyval.exp = new ByteDerefExpression(yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 24:
-#line 86 "stella.y"
-{ fprintf(stderr, " U@"); yyval.exp = new WordDerefExpression(yyvsp[0].exp); lastExp = yyval.exp; }
+#line 90 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " U@"); yyval.exp = new WordDerefExpression(yyvsp[0].exp); lastExp = yyval.exp; }
     break;
 case 25:
-#line 87 "stella.y"
-{ fprintf(stderr, " U<");  yyval.exp = new LoByteExpression(yyvsp[0].exp);  lastExp = yyval.exp; }
+#line 91 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " U<");  yyval.exp = new LoByteExpression(yyvsp[0].exp);  lastExp = yyval.exp; }
     break;
 case 26:
-#line 88 "stella.y"
-{ fprintf(stderr, " U>");  yyval.exp = new HiByteExpression(yyvsp[0].exp);  lastExp = yyval.exp; }
+#line 92 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " U>");  yyval.exp = new HiByteExpression(yyvsp[0].exp);  lastExp = yyval.exp; }
     break;
 case 27:
-#line 89 "stella.y"
-{ fprintf(stderr, " ()"); yyval.exp = yyvsp[-1].exp; lastExp = yyval.exp; }
+#line 93 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " ()"); yyval.exp = yyvsp[-1].exp; lastExp = yyval.exp; }
     break;
 case 28:
-#line 90 "stella.y"
-{ fprintf(stderr, " []"); yyval.exp = new ByteDerefOffsetExpression(yyvsp[-3].exp, yyvsp[-1].exp); lastExp = yyval.exp; }
+#line 94 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " []"); yyval.exp = new ByteDerefOffsetExpression(yyvsp[-3].exp, yyvsp[-1].exp); lastExp = yyval.exp; }
     break;
 case 29:
-#line 91 "stella.y"
-{ fprintf(stderr, " %d", yyvsp[0].val); yyval.exp = new ConstExpression(yyvsp[0].val); lastExp = yyval.exp; }
+#line 95 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " %d", yyvsp[0].val); yyval.exp = new ConstExpression(yyvsp[0].val); lastExp = yyval.exp; }
     break;
 case 30:
-#line 92 "stella.y"
-{ fprintf(stderr, " %s", yyvsp[0].equate); yyval.exp = new EquateExpression(yyvsp[0].equate); lastExp = yyval.exp; }
+#line 96 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " %s", yyvsp[0].equate); yyval.exp = new EquateExpression(yyvsp[0].equate); lastExp = yyval.exp; }
     break;
 case 31:
-#line 93 "stella.y"
-{ fprintf(stderr, " (CpuMethod)"); yyval.exp = new CpuMethodExpression(yyvsp[0].cpuMethod); lastExp = yyval.exp; }
+#line 97 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " (CpuMethod)"); yyval.exp = new CpuMethodExpression(yyvsp[0].cpuMethod); lastExp = yyval.exp; }
     break;
 case 32:
-#line 94 "stella.y"
-{ fprintf(stderr, " (TiaMethod)"); yyval.exp = new TiaMethodExpression(yyvsp[0].tiaMethod); lastExp = yyval.exp; }
+#line 98 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " (TiaMethod)"); yyval.exp = new TiaMethodExpression(yyvsp[0].tiaMethod); lastExp = yyval.exp; }
     break;
 case 33:
-#line 95 "stella.y"
-{ fprintf(stderr, " (function)"); yyval.exp = new FunctionExpression(yyvsp[0].function); lastExp = yyval.exp; }
+#line 99 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " (function)"); yyval.exp = new FunctionExpression(yyvsp[0].function); lastExp = yyval.exp; }
     break;
 case 34:
-#line 96 "stella.y"
-{ fprintf(stderr, " ERR"); yyerror("Invalid label or constant"); return 1; }
+#line 100 "stella.y"
+{ if(DEBUG_EXP) fprintf(stderr, " ERR"); yyerror("Invalid label or constant"); return 1; }
     break;
 }
 
@@ -1341,5 +1345,5 @@ yyreturn:
 #endif
   return yyresult;
 }
-#line 98 "stella.y"
+#line 102 "stella.y"