Fixed bug affecting undocumented opcode IM 2 (ED 7E). It was swapped …

…by an undocumented NOP (ED 77). Found by McLeod_ideafix. Detected crashing on MQM3 demo because this bug

Co-authored-by: antoniovillena <_@antoniovillena.es>

rtl/T80/T80_MCode.vhd

@@ -1598,7 +1598,7 @@ begin
 				|"11110000"|"11110001"|"11110010"|"11110011"|"11110100"|"11110101"|"11110110"|"11110111"
 				|"11111000"|"11111001"|"11111010"|"11111011"|"11111100"|"11111101"|"11111110"|"11111111" =>
 				null; -- NOP, undocumented
-			when "01111110"|"01111111" =>
+			when "01110111"|"01111111" =>
 				-- NOP, undocumented
 				null;
 -- 8 BIT LOAD GROUP
@@ -1754,7 +1754,7 @@ begin
 			when "01010110"|"01110110" =>
 				-- IM 1
 				IMode <= "01";
-			when "01011110"|"01110111" =>
+			when "01011110"|"01111110" =>
 				-- IM 2
 				IMode <= "10";
 -- 16 bit arithmetic