diff --git a/lib/CPUs/MIPS/bsp/examples/libsys.h b/lib/CPUs/MIPS/bsp/examples/libsys.h
index 25b7b79..e0798c3 100644
--- a/lib/CPUs/MIPS/bsp/examples/libsys.h
+++ b/lib/CPUs/MIPS/bsp/examples/libsys.h
@@ -17,6 +17,10 @@
 #define FLOAT32		float
 #define FLOAT64		double
 
+#define	LSYS_SUCCESS	0
+#define	LSYS_ERR_BASE	0x80000000
+
+#define	IS_ERROR(e)		((e & LSYS_ERR_BASE) == LSYS_ERR_BASE)
 
 #define	sys_gpio0		0xA0000000
 #define	sys_gpio1		0xA0000004
@@ -24,10 +28,18 @@
 #define	sys_usb_ctrl	sys_gpio1
 #define	sys_timer_usec	0xA0000008
 #define	sys_timer_sec	0xA000000C
-#define	sys_itim_ctrl	0xA0000010
-#define	sys_itim_stat	0xA0000014
-#define	sys_itim_cnt	0xA0000018
-#define	sys_itim_cmp	0xA000001C
+
+#define	sys_itim_ctrl	0xA0000018
+#define	sys_itim_stat	0xA000001C
+#define	sys_itim0_cnt	0xA0000020
+#define	sys_itim1_cnt	0xA0000024
+#define	sys_itim2_cnt	0xA0000028
+#define	sys_itim3_cnt	0xA000002C
+#define	sys_itim0_cmp	0xA0000030
+#define	sys_itim1_cmp	0xA0000034
+#define	sys_itim2_cmp	0xA0000038
+#define	sys_itim3_cmp	0xA000003C
+
 #define	sys_uart_data	0xA0010000
 #define	sys_uart_stat	0xA0010004
 #define	sys_uart_baud	0xA0010008
@@ -40,6 +52,7 @@
 #define	sys_vga_posy	0xA0030010
 #define	sys_vga_clrscr	0xA0030020
 #define	sys_vga_clrline	0xA0030040
+#define	sys_vga_cgcol	0xA0030080
 #define	sys_vga_mctrl	0xA0030100
 #define	sys_vga_moffs	0xA0030200
 #define	sys_ac97_stat	0xA0040000