Added int29 (Fast Write to Screen) support.

msdos/int29.c

@@ -0,0 +1,25 @@
+/*
+ * DOS interrupt 29h handler
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "ldt.h"
+#include "drive.h"
+#include "msdos.h"
+#include "miscemu.h"
+#include "module.h"
+
+/**********************************************************************
+ *	    INT_Int29Handler
+ *
+ * Handler for int 29h (fast console output)
+ */
+void WINAPI INT_Int29Handler( CONTEXT *context )
+{
+   /* Yes, it seems that this is really all this interrupt does. */
+   _lwrite16( 1, &AL_reg(context), 1);
+}
+