diff --git a/src/isr.c b/src/isr.c
index 323fd971f..de7c8e1b7 100644
--- a/src/isr.c
+++ b/src/isr.c
@@ -1,5 +1,4 @@
 #include "embedded_types.h"
-//#include "interrupt-utils.h"
 #include "isr.h"
 
 #define reg32(x) (*(volatile uint32_t *)(x))
@@ -8,18 +7,7 @@ __attribute__ ((section (".irq")))
 __attribute__ ((interrupt("IRQ"))) 
 void irq(void)
 {
-//	ISR_ENTRY();
-	/* check for TMR0 interrupt */
 	if(tmr_isr != NULL) {
-		tmr_isr(); // led turns off if I have this, indicating that the isr does jump to tmr_isr
+		tmr_isr(); 
 	}
-//	if(reg32(INTSRC) & (1<<5)) { tmr_isr(); }
-//	asm("SUBS PC,R14_IRQ,#4")
-//	enableIRQ(); // I think this is necessary, but the LED never turns off when I have this
-//	ISR_EXIT();  // behavior doesn't change if I have this or not. 
-
-/* putting anything in here breaks the other code :( */
-
-//	asm("ldmfd sp!, {r0-r12,lr}");
-//	enableIRQ();
 }