Index: uspace/app/msim/helenos.c
===================================================================
--- uspace/app/msim/helenos.c	(revision e61aa802b6438793f4a350ef8eec5266ca467d80)
+++ uspace/app/msim/helenos.c	(revision 341b5155553dd6d613629bd6d5bc76474f5692e8)
@@ -34,4 +34,5 @@
 #include "io/input.h"
 #include "io/output.h"
+#include "device/dprinter.h"
 #include "debug/gdb.h"
 #include "cmd.h"
@@ -40,4 +41,11 @@
 #include <str.h>
 #include <malloc.h>
+#include <ctype.h>
+#include <stdio.h>
+
+/* Define when the dprinter device shall try to filter
+ * out ANSI escape sequences.
+ */
+#define IGNORE_ANSI_ESCAPE_SEQUENCES
 
 extern char *input_helenos_get_next_command(void);
@@ -87,2 +95,46 @@
 
 
+char *input_helenos_get_next_command(void);
+
+static void (*original_printer_write)(cpu_t *, device_s *, ptr_t, uint32_t);
+static void helenos_printer_write(cpu_t *cpu, device_s *dev, ptr_t addr, uint32_t val)
+{
+#ifdef IGNORE_ANSI_ESCAPE_SEQUENCES
+	static bool inside_ansi_escape = false;
+	static bool just_ended_ansi_escape = false;
+
+	if (inside_ansi_escape) {
+		fprintf(stderr, "%02" PRIx32 "'%c' ", val, val >= 32 ? val : '?');
+		if (isalpha((int) val)) {
+			just_ended_ansi_escape = true;
+			inside_ansi_escape = false;
+			fprintf(stderr, " [END]\n");
+		}
+
+		return;
+	}
+
+	if (val == 0x1B) {
+		inside_ansi_escape = true;
+
+		if (!just_ended_ansi_escape) {
+			fprintf(stderr, "\n");
+		}
+		fprintf(stderr, "ESC sequence: ");
+
+		return;
+	}
+
+	just_ended_ansi_escape = false;
+#endif
+
+	(*original_printer_write)(cpu, dev, addr, val);
+}
+
+void helenos_dprinter_init(void)
+{
+	original_printer_write = dprinter.write;
+	dprinter.write = helenos_printer_write;
+}
+
+
Index: uspace/app/msim/helenos_input.c
===================================================================
--- uspace/app/msim/helenos_input.c	(revision e61aa802b6438793f4a350ef8eec5266ca467d80)
+++ uspace/app/msim/helenos_input.c	(revision 341b5155553dd6d613629bd6d5bc76474f5692e8)
@@ -41,4 +41,5 @@
 
 char *input_helenos_get_next_command(void);
+void helenos_dprinter_init(void);
 
 /** Terminal and readline initialization
@@ -51,4 +52,5 @@
 		die(1, "Failed to intialize input.");
 	}
+	helenos_dprinter_init();
 }