diff --git a/lib/CPUs/MIPS/src/core/mips_instr.vhd b/lib/CPUs/MIPS/src/core/mips_instr.vhd
index dbaf405..cbfc588 100644
--- a/lib/CPUs/MIPS/src/core/mips_instr.vhd
+++ b/lib/CPUs/MIPS/src/core/mips_instr.vhd
@@ -314,6 +314,7 @@ package body mips_instr is
 			result	:= op_lui;
 
 		when 16 =>
+			result	:= op_cop0;
 			case rs is
 				when 0 =>
 					result	:= op_mfc0;
@@ -338,6 +339,7 @@ package body mips_instr is
 			end case;
 
 		when 17 =>
+			result	:= op_cop1;
 			case rs is
 				when 0 =>
 					result	:= op_mfc1;
@@ -362,6 +364,7 @@ package body mips_instr is
 			end case;
 
 		when 18 =>
+			result	:= op_cop2;
 			case rs is
 				when 0 =>
 					result	:= op_mfc2;
@@ -386,6 +389,7 @@ package body mips_instr is
 			end case;
 
 		when 19 =>
+			result	:= op_cop3;
 			case rs is
 				when 0 =>
 					result	:= op_mfc3;
diff --git a/lib/CPUs/MIPS/src/core/mips_types.vhd b/lib/CPUs/MIPS/src/core/mips_types.vhd
index 291032e..84acf0d 100644
--- a/lib/CPUs/MIPS/src/core/mips_types.vhd
+++ b/lib/CPUs/MIPS/src/core/mips_types.vhd
@@ -43,8 +43,6 @@ package mips_types is
 	subtype sa_t is natural range 0 to 63;
 	subtype func_t is unsigned(5 downto 0);
 
-	type opclass_t is (special, regimm, opcode);
-	
 	type op_t is
 	(
 		nop,
@@ -106,6 +104,10 @@ package mips_types is
 		op_swl,
 		op_sw,
 		op_swr,
+		op_cop0,
+		op_cop1,
+		op_cop2,
+		op_cop3,
 		op_mfc0,
 		op_cfc0,
 		op_mtc0,