diff --git a/stix/kernel/Collection.st b/stix/kernel/Collect.st
similarity index 100%
rename from stix/kernel/Collection.st
rename to stix/kernel/Collect.st
diff --git a/stix/kernel/Stix.st b/stix/kernel/Stix.st
index a44d889..915a768 100644
--- a/stix/kernel/Stix.st
+++ b/stix/kernel/Stix.st
@@ -246,8 +246,7 @@
 }
 
 
-#include 'Collection.st'.
-## #include 'Collec~1.st'.
+#include 'Collect.st'.
 
 #class(#pointer) CompiledMethod(Object)
 {
diff --git a/stix/kernel/test-010.st b/stix/kernel/test-010.st
index e463ef3..f79d1e1 100644
--- a/stix/kernel/test-010.st
+++ b/stix/kernel/test-010.st
@@ -58,13 +58,13 @@
 		s2 := Semaphore new.
 
 		t1 := [ 
-			10000 timesRepeat: ['BLOCK #1' dump].
+			100 timesRepeat: ['BLOCK #1' dump].
 			##s2 critical: [
 			##	10 timesRepeat: ['BLOCK #1' dump ]
 			##]
 		] newProcess.
 		t2 := [ 
-			10000 timesRepeat: ['BLOCK #2' dump].
+			100 timesRepeat: ['BLOCK #2' dump].
 			##s2 critical: [
 			##	10 timesRepeat: ['BLOCK #2' dump. ]
 			##].
diff --git a/stix/lib/exec.c b/stix/lib/exec.c
index 66d7ba4..2be9714 100644
--- a/stix/lib/exec.c
+++ b/stix/lib/exec.c
@@ -90,6 +90,7 @@
 	#define LOAD_ACTIVE_SP(stix) LOAD_SP(stix, (stix)->processor->active)
 	#define STORE_ACTIVE_SP(stix) STORE_SP(stix, (stix)->processor->active)
 
+/* TODO: stack bound check when pushing */
 	#define ACTIVE_STACK_PUSH(stix,v) \
 		do { \
 			(stix)->sp = (stix)->sp + 1; \
diff --git a/stix/lib/main.c b/stix/lib/main.c
index a175934..b23b765 100644
--- a/stix/lib/main.c
+++ b/stix/lib/main.c
@@ -45,7 +45,7 @@
 #	define INCL_DOSERRORS
 #	include <os2.h>
 #elif defined(__MSDOS__)
-	/* nothing to include */
+#	include <dos.h>
 #elif defined(macintosh)
 	/* nothing to include */
 #else
@@ -386,14 +386,39 @@ stix_ooch_t str_main[] = { 'm', 'a', 'i', 'n' };
 
 stix_t* g_stix = STIX_NULL;
 
+#if defined(__MSDOS__) && defined(_INTELC32_)
+static void (*prev_timer_intr_handler) (void);
+
+#pragma interrupt(timer_intr_handler)
+static void timer_intr_handler (void)
+{
+	/*
+	_XSTACK *stk;
+	int r;
+	stk = (_XSTACK *)_get_stk_frame();
+	r = (unsigned short)stk_ptr->eax;   
+	*/
+
+	/* The timer interrupt (normally) occurs 18.2 times per second. */
+	if (g_stix) stix_switchprocess (g_stix);
+	_chain_intr(prev_timer_intr_handler);
+}
+
+#else
 static void arrange_process_switching (int sig)
 {
 	if (g_stix) stix_switchprocess (g_stix);
 }
+#endif
 
 static void setup_tick (void)
 {
-#if defined(HAVE_SETITIMER) && defined(SIGVTALRM) && defined(ITIMER_VIRTUAL)
+#if defined(__MSDOS__) && defined(_INTELC32_)
+
+	prev_timer_intr_handler = _dos_getvect (0x1C);
+	_dos_setvect (0x1C, timer_intr_handler);
+
+#elif defined(HAVE_SETITIMER) && defined(SIGVTALRM) && defined(ITIMER_VIRTUAL)
 	struct itimerval itv;
 	struct sigaction act;
 
@@ -407,12 +432,19 @@ static void setup_tick (void)
 	itv.it_value.tv_sec = 0;
 	itv.it_value.tv_usec = 100;
 	setitimer (ITIMER_VIRTUAL, &itv, STIX_NULL);
+#else
+
+#	error UNSUPPORTED
 #endif
 }
 
 static void cancel_tick (void)
 {
-#if defined(HAVE_SETITIMER) && defined(SIGVTALRM) && defined(ITIMER_VIRTUAL)
+#if defined(__MSDOS__) && defined(_INTELC32_)
+
+	_dos_setvect (0x1C, prev_timer_intr_handler);
+
+#elif defined(HAVE_SETITIMER) && defined(SIGVTALRM) && defined(ITIMER_VIRTUAL)
 	struct itimerval itv;
 	struct sigaction act;
 
@@ -427,6 +459,9 @@ static void cancel_tick (void)
 	act.sa_handler = SIG_DFL;
 	act.sa_flags = 0;
 	sigaction (SIGVTALRM, &act, STIX_NULL);
+
+#else
+#	error UNSUPPORTED
 #endif
 }
 
diff --git a/stix/lib/stix-prv.h b/stix/lib/stix-prv.h
index 03b38bf..33df748 100644
--- a/stix/lib/stix-prv.h
+++ b/stix/lib/stix-prv.h
@@ -54,7 +54,7 @@
 
 /* this is for gc debugging */
 /*#define STIX_DEBUG_PROCESSOR*/
-#define STIX_DEBUG_GC_001
+/*#define STIX_DEBUG_GC_001*/
 /*#define STIX_DEBUG_GC_002*/
 #define STIX_DEBUG_COMP_001
 /*#define STIX_DEBUG_COMP_002*/