diff --git a/C64_1351_Mouse/README.md b/C64_1351_Mouse/README.md
index dfd5632..fd88b87 100644
--- a/C64_1351_Mouse/README.md
+++ b/C64_1351_Mouse/README.md
@@ -1,6 +1,29 @@
-Pin 9 and 10 needed for timer. Move SS and INT of USB host shield away:
-```
+#### Pin 9 and 10 needed for TIMER1. Move SS and INT of USB host shield away
+
 C:\Users\xxxxx\Documents\Arduino\libraries\USB_Host_Shield_Library_2.0\UsbCore.h:
-//Arduino Pro Micro SS -> A0, INT -> A1:
+```
+//typedef MAX3421e<P10, P9> MAX3421E;
+//Arduino Pro Micro SS=A0, INT=A1:
 typedef MAX3421e<P18, P19> MAX3421E;
 ```
+https://ist.uwaterloo.ca/~schepers/MJK/pics/joyports.gif
+
+#### Joystick port -> Arduino
+- 9 (POTX) -> 1k -> 9 (OC1A)
+- 9 (POTX) -> (ICP1) Arduino Pro Micro: 4, Arduino Uno: 8
+- 5 (POTY) -> 1k -> 10 (OC1B)
+- 6 (FIRE) -> 5
+- 1 (UP) -> 6
+
+#### USB Host Shield -> Arduino
+- SS -> A0 (Arduino Pro Micro) (check UsbCore.h)
+- INT -> A1 (Arduino Pro Micro) (check UsbCore.h)
+- MOSI -> 11 (Arduino Uno), 16 (Arduino Pro Micro)
+- MISO -> 12 (Arduino Uno), 14 (Arduino Pro Micro)
+- CLK -> 13 (Arduino Uno), 15 (Arduino Pro Micro)
+- RST -> RST
+- GND -> GND
+- VCC -> 3.3V
+- VBUS -> 5V (cut trace from VBUS-pad to resistor!)
+
+