disa improvements from PicoDrive

diff --git a/Disa/Disa.c b/Disa/Disa.c
index 01a54bc..562929b 100644 (file)
--- a/Disa/Disa.c
+++ b/Disa/Disa.c
@@ -283,6 +283,21 @@ static int DisaMoveSr(int op)
   return 0;\r
 }\r
 \r
+static int OpChk(int op)\r
+{\r
+  int sea=0,dea=0;\r
+  char seat[64]="",deat[64]="";\r
+\r
+  sea=op&0x003f;\r
+  DisaGetEa(seat,sea,0);\r
+\r
+  dea=(op>>9)&7; dea|=8;\r
+  DisaGetEa(deat,dea,2);\r
+\r
+  sprintf(DisaText,"chk %s, %s",seat,deat);\r
+  return 0;\r
+}\r
+\r
 // ================ Opcodes 0x41c0+ ================\r
 static int DisaLea(int op)\r
 {\r
@@ -337,6 +352,20 @@ static int MakeRegList(char *list,int mask,int ea)
   return 0;\r
 }\r
 \r
+// ================ Opcodes 0x4800+ ================\r
+static int DisaNbcd(int op)\r
+{\r
+  // Nbcd 01001000 00eeeeee  (eeeeee=ea)\r
+  int ea=0;\r
+  char eat[64]="";\r
+\r
+  ea=op&0x003f;\r
+  DisaGetEa(eat,ea,0);\r
+\r
+  sprintf(DisaText,"nbcd %s",eat);\r
+  return 0;\r
+}\r
+\r
 // ================ Opcodes 0x4840+ ================\r
 static int DisaSwap(int op)\r
 {\r
@@ -476,6 +505,19 @@ static int DisaTst(int op)
   return 0;\r
 }\r
 \r
+static int DisaTas(int op)\r
+{\r
+  // Tas 01001010 11eeeeee  (eeeeee=ea)\r
+  int ea=0;\r
+  char eat[64]="";\r
+\r
+  ea=op&0x003f;\r
+  DisaGetEa(eat,ea,0);\r
+\r
+  sprintf(DisaText,"tas %s",eat);\r
+  return 0;\r
+}\r
+\r
 // ================ Opcodes 0x4e80+ ================\r
 static int DisaJsr(int op)\r
 {\r
@@ -741,14 +783,16 @@ static int DisaExg(int op)
 static int DisaAddx(int op)\r
 {\r
   // 1t01ddd1 xx000sss addx\r
-  int type=0,size=0,dea=0,sea=0;\r
+  int type=0,size=0,dea=0,sea=0,mem;\r
   char deat[64]="",seat[64]="";\r
   char *opcode[6]={"","subx","","","","addx"};\r
 \r
   type=(op>>12)&5;\r
   dea =(op>> 9)&7;\r
   size=(op>> 6)&3; if (size>=3) return 1;\r
-  sea  = op&0x3f;\r
+  sea = op&7;\r
+  mem = op&8;\r
+  if(mem) { sea+=0x20; dea+=0x20; }\r
 \r
   DisaGetEa(deat,dea,size);\r
   DisaGetEa(seat,sea,size);\r
@@ -805,13 +849,16 @@ static int TryOp(int op)
   if ((op&0xff00)==0x0800) DisaBtstImm(op); // Btst/Bchg/Bclr/Bset\r
   if ((op&0xc000)==0x0000) DisaMove(op);\r
   if ((op&0xf900)==0x4000) DisaNeg(op); // Negx/Clr/Neg/Not\r
+  if ((op&0xf140)==0x4100) OpChk(op);\r
   if ((op&0xf1c0)==0x41c0) DisaLea(op);\r
   if ((op&0xf9c0)==0x40c0) DisaMoveSr(op);\r
+  if ((op&0xffc0)==0x4800) DisaNbcd(op);\r
   if ((op&0xfff8)==0x4840) DisaSwap(op);\r
   if ((op&0xffc0)==0x4840) DisaPea(op);\r
   if ((op&0xffb8)==0x4880) DisaExt(op);\r
   if ((op&0xfb80)==0x4880) DisaMovem(op);\r
   if ((op&0xff00)==0x4a00) DisaTst(op);\r
+  if ((op&0xffc0)==0x4ac0) DisaTas(op);\r
   if ((op&0xfff0)==0x4e40) DisaTrap(op);\r
   if ((op&0xfff8)==0x4e50) DisaLink(op);\r
   if ((op&0xfff8)==0x4e58) DisaUnlk(op);\r