diff --git a/.DS_Store b/.DS_Store
index 50bf391..7f8d5b5 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/IIc-USB/Arduino/IIc_keyboard/IIc_keyboard.ino b/IIc-USB/Arduino/IIc_keyboard/IIc_keyboard.ino
index 201f675..fcd6e52 100644
--- a/IIc-USB/Arduino/IIc_keyboard/IIc_keyboard.ino
+++ b/IIc-USB/Arduino/IIc_keyboard/IIc_keyboard.ino
@@ -127,7 +127,7 @@ J9 pinout
 20	Y3
 21		GROUND ???
 22	X2
-23		GROUND ???
+23	5V
 24	X1
 25	POWER LED (5v)
 26	OPEN APPLE
diff --git a/IIc-USB/PCB/rev4/retro-connector-IIc.fzz b/IIc-USB/PCB/rev4/retro-connector-IIc.fzz
new file mode 100644
index 0000000..a84902a
Binary files /dev/null and b/IIc-USB/PCB/rev4/retro-connector-IIc.fzz differ