diff --git a/cMIPS/include/handlers.s b/cMIPS/include/handlers.s
index e39b4c2a8208bb202e344495c4c68b388ddf97e7..2ecddca025c27a98bbde443e2c067905dc58afd7 100644
--- a/cMIPS/include/handlers.s
+++ b/cMIPS/include/handlers.s
@@ -73,18 +73,16 @@ extCounter:
 	.bss 
         .align  2
 	.set noreorder
-	.global rx_queue,rx_hd,rx_tl   # reception queue and pointers
-	.comm   rx_queue 16
+	.global Ud
+Ud:	.comm   rx_queue 16       # reception queue and pointers
 	.comm   rx_hd 4
 	.comm   rx_tl 4
-	.global tx_queue,tx_hd,tx_tl   # transmission queue and pointers
-	.comm   tx_queue 16
+	.comm   tx_queue 16       # transmission queue and pointers
 	.comm   tx_hd 4
 	.comm   tx_tl 4
-	.global nrx,ntx
-	.comm   nrx 4                  # characters in RX_queue
-	.comm   ntx 4                  # spaces left in TX_queue
-        .comm   _uart_buff 16*4        # up to 16 registers to be saved here
+	.comm   nrx 4             # characters in RX_queue
+	.comm   ntx 4             # spaces left in TX_queue
+        .comm   _uart_buff 16*4   # up to 16 registers to be saved here
 
 	.set UART_rx_irq,0x08
 	.set UART_tx_irq,0x10
diff --git a/cMIPS/tests/uart_irx.c b/cMIPS/tests/uart_irx.c
index 966c83621f3fb68c10c0436e942703c8561f857e..1641f476af1fdf62272250161c84a08e167bb085 100644
--- a/cMIPS/tests/uart_irx.c
+++ b/cMIPS/tests/uart_irx.c
@@ -35,8 +35,8 @@ typedef union data {    // data registers on same address
 } Tdata;
 
 typedef struct serial {
-  TctlStat cs;
-  Tdata    d;
+  TctlStat cs;          // @ (int *)IO_UART_ADDR
+  Tdata    d;           // @ (int *)(IO_UART_ADDR+1)
 } Tserial;
 
 
@@ -56,7 +56,7 @@ int main(void) { // receive a string through the UART serial interface
   ctrl.speed = 1;    // operate at 1/2 of the highest data rate
   uart->cs.ctl = ctrl;
 
-  // handler sets flag=bfr[2] to 1 after new character is read;
+  // handler sets flag=bfr[2] to 1 after new character is received;
   // this program resets the flag on fetching a new character from buffer
 
   c = (char)bfr[2];   // interrupt handler's flag