Some interrupt enhancements.

include/miscemu.h

@@ -55,9 +55,15 @@ extern void WINAPI INT_Int10Handler(CONTEXT*);
 /* msdos/int11.c */
 extern void WINAPI INT_Int11Handler(CONTEXT*);
 
+/* msdos/int12.c */
+extern void WINAPI INT_Int12Handler(CONTEXT*);
+
 /* msdos/int13.c */
 extern void WINAPI INT_Int13Handler(CONTEXT*);
 
+/* msdos/int15.c */
+extern void WINAPI INT_Int15Handler(CONTEXT*);
+
 /* msdos/int16.c */
 extern void WINAPI INT_Int16Handler(CONTEXT*);
 

msdos/int10.c

@@ -18,6 +18,8 @@ static void scroll_window(int direction, char lines, char row1,
 
 static int color_pallet[16];
 
+static char dummy; /* dummy var used for unneeded CONSOLE function parameter */
+
 #define SCROLL_UP 1
 #define SCROLL_DOWN 2
 
@@ -188,8 +190,13 @@ void WINAPI INT_Int10Handler( CONTEXT *context )
         break;
 
     case 0x08: /* READ CHARACTER AND ATTRIBUTE AT CURSOR POSITION */
-        FIXME(int10, 
-          "Read Character and Attribute at Cursor Position - Not Supported\n");
+        {
+        CHAR ch, attr;
+        TRACE(int10, "Read Character and Attribute at Cursor Position\n");
+        CONSOLE_GetCharacterAtCursor(&ch, &dummy, &dummy, &attr);
+        AL_reg(context) = ch;
+        AH_reg(context) = attr; 
+        }
         break;
 
     case 0x09: /* WRITE CHARACTER AND ATTRIBUTE AT CURSOR POSITION */

msdos/int21.c

@@ -1155,8 +1155,12 @@ void WINAPI DOS3Call( CONTEXT *context )
 	      DS_reg(context),DX_reg(context) );
         {
             LPSTR data = CTX_SEG_OFF_TO_LIN(context,DS_reg(context),EDX_reg(context));
-            LONG length = strchr(data,'$')-data;
-            _hwrite16( 1, data, length);
+            LPSTR p = data;
+            /* do NOT use strchr() to calculate the string length,
+            as '\0' is valid string content, too !
+            Maybe we should check for non-'$' strings, but DOS doesn't. */
+            while (*p != '$') p++;
+            _hwrite16( 1, data, (int)p - (int)data);
             AL_reg(context) = '$'; /* yes, '$' (0x24) gets returned in AL */
         }
         break;

msdos/interrupts.c

@@ -111,9 +111,15 @@ int INT_RealModeInterrupt( BYTE intnum, PCONTEXT context )
         case 0x11:
             INT_Int11Handler(context);
             break;
+        case 0x12:
+            INT_Int12Handler(context);
+            break;
 	case 0x13:
 	    INT_Int13Handler(context);
             break;
+        case 0x15:
+            INT_Int15Handler(context);
+            break;
         case 0x16:
             INT_Int16Handler(context);
             break;