1 files changed, 12 insertions, 0 deletions
diff --git a/src/dos/dos.cpp b/src/dos/dos.cpp
index 6081899ec..46cf79472 100644
--- a/src/dos/dos.cpp
+++ b/src/dos/dos.cpp
@@ -1267,6 +1267,18 @@ static Bitu DOS_21Handler(void) {
 				}
 				CALLBACK_SCF(false);
 				break;
+			case 0x23: /* Determine if character represents yes/no response */
+				{
+						unsigned int c = reg_dl;
+						if (tolower(c) == 'y')
+								reg_ax = 1;/*yes*/
+						else if (tolower(c) == 'n')
+								reg_ax = 0;/*no*/
+						else
+								reg_ax = 2;/*neither*/
+				}
+				CALLBACK_SCF(false);
+				break;
 			default:
 				E_Exit("DOS:0x65:Unhandled country information call %2X",reg_al);	
 			};