Index: branches/zenith432/i386/libsaio/biosfn.c
===================================================================
--- branches/zenith432/i386/libsaio/biosfn.c	(revision 2594)
+++ branches/zenith432/i386/libsaio/biosfn.c	(revision 2595)
@@ -1042,3 +1042,10 @@
     bios(&bb);
 }
 
+void enableA20(void)
+{
+    bzero(&bb, sizeof bb);  // Note: may be called before BSS section is initialized
+    bb.intno = 0x15;
+    bb.eax.rr = 0x2401;
+    bios(&bb);
+}
Index: branches/zenith432/i386/libsaio/misc.c
===================================================================
--- branches/zenith432/i386/libsaio/misc.c	(revision 2594)
+++ branches/zenith432/i386/libsaio/misc.c	(revision 2595)
@@ -46,6 +46,7 @@
 
 #include "libsaio.h"
 
+#if UNUSED
 /*
  * keyboard controller (8042) I/O port addresses
  */
@@ -107,6 +108,7 @@
     /* wait until done */
     flushKeyboardInputBuffer();
 }
+#endif /* UNUSED */
 
 //==========================================================================
 // Return the platform name for this hardware.
Index: branches/zenith432/i386/libsaio/saio_internal.h
===================================================================
--- branches/zenith432/i386/libsaio/saio_internal.h	(revision 2594)
+++ branches/zenith432/i386/libsaio/saio_internal.h	(revision 2595)
@@ -72,6 +72,7 @@
 extern unsigned long getExtendedMemorySize();
 extern unsigned long getConventionalMemorySize();
 extern void   sleep(int n);
+extern void   enableA20(void);
 
 /* bootstruct.c */
 extern void   initKernBootStruct(void);
@@ -137,7 +138,6 @@
 long AllocateMemoryRange(char *rangeName, long start, long length, long type);
 
 /* misc.c */
-extern void   enableA20(void);
 extern int    checkForSupportedHardware();
 extern int	  isLaptop();
 extern void   getPlatformName(char *nameBuf);
Index: branches/zenith432/i386/boot2/boot.c
===================================================================
--- branches/zenith432/i386/boot2/boot.c	(revision 2594)
+++ branches/zenith432/i386/boot2/boot.c	(revision 2595)
@@ -418,9 +418,9 @@
 // own things, and then calls common_boot.
 void boot(int biosdev)
 {
-	initialize_runtime();
 	// Enable A20 gate before accessing memory above 1Mb.
 	enableA20();
+	initialize_runtime();
 	common_boot(biosdev);
 }
 
Index: branches/zenith432/i386/libsa/zalloc.c
===================================================================
--- branches/zenith432/i386/libsa/zalloc.c	(revision 2594)
+++ branches/zenith432/i386/libsa/zalloc.c	(revision 2595)
@@ -75,7 +75,7 @@
 	zalloc_base         = start ? start : (char *)ZALLOC_ADDR;
 	totalNodes          = nodes ? nodes : ZALLOC_NODES;
 	zalloced            = (zmem *) zalloc_base;
-	zavailable          = (zmem *) zalloc_base + sizeof(zmem) * totalNodes;
+	zavailable          = (zmem *) (zalloc_base + sizeof(zmem) * totalNodes);
 	zavailable[0].start = (char *)zavailable + sizeof(zmem) * totalNodes;
 
 	if (size == 0)