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diff --git a/app.h b/app.h
index f041dff..cffd2cb 100644
--- a/app.h
+++ b/app.h
@@ -24,6 +24,13 @@
 #include "Disa/Disa.h"
 
 // Ea.cpp
+enum EaRWType {
+  earwt_sign_extend = 1,
+  earwt_zero_extend,
+  earwt_shifted_up,
+  earwt_msb_dont_care,
+};
+
 extern int earead_check_addrerr;
 extern int eawrite_check_addrerr;
 extern int g_jmp_cycle_table[];
@@ -32,12 +39,11 @@ extern int g_lea_cycle_table[];
 extern int g_pea_cycle_table[];
 extern int g_movem_cycle_table[];
 int Ea_add_ns(int *tab, int ea); // add nonstandard EA cycles
-int EaCalc(int a,int mask,int ea,int size,int top=0,int sign_extend=1); // 6
-int EaRead(int a,int v,int ea,int size,int mask,int top=0,int sign_extend=1,int set_nz=0); // 8
-int EaCalcRead(int r_ea,int r,int ea,int size,int mask,int sign_extend=1,int set_nz=0); // 7
-int EaCalcReadNoSE(int r_ea,int r,int ea,int size,int mask);
+int EaCalc(int a,int mask,int ea,int size,EaRWType type=earwt_sign_extend); // 6
+int EaRead(int a,int v,int ea,int size,int mask,EaRWType type=earwt_sign_extend,int set_nz=0); // 8
+int EaCalcRead(int r_ea,int r,int ea,int size,int mask,EaRWType type=earwt_sign_extend,int set_nz=0); // 7
 int EaCanRead(int ea,int size);
-int EaWrite(int a,int v,int ea,int size,int mask,int top=0,int sign_extend_ea=1);
+int EaWrite(int a,int v,int ea,int size,int mask,EaRWType type=earwt_sign_extend);
 int EaCanWrite(int ea);
 int EaAn(int ea);