diff --git a/C64_4joy_adapter/README.md b/C64_4joy_adapter/README.md
index f9e13ce..d6f7e08 100644
--- a/C64_4joy_adapter/README.md
+++ b/C64_4joy_adapter/README.md
@@ -4,8 +4,15 @@
 
 ```
  PORTB = *ptr; // is this atomic? probably, because ptr is 6-bit pointer.
- f98:	e0 91 26 01 	lds	r30, 0x0126	; 0x800126 <__data_end>
- f9c:	f0 91 27 01 	lds	r31, 0x0127	; 0x800127 <__data_end+0x1>
- fa0:	80 81       	ld	r24, Z
- fa2:	85 b9       	out	0x05, r24	; 5
+ f98:	e0 91 26 01 	lds	r30, 0x0126	; 0x800126 <__data_end> // 2 clocks
+ f9c:	f0 91 27 01 	lds	r31, 0x0127	; 0x800127 <__data_end+0x1> // 2 clocks
+ fa0:	80 81       	ld	r24, Z // 1 clock
+ fa2:	85 b9       	out	0x05, r24	; 5 // 1 clock
+``` 
+
+```
+mov r31, r1
+mov r30, gpior2
+ld	r24, Z
+out	0x05, r24
 ```