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-rw-r--r--converter/ibm4704_usb/README.md33
1 files changed, 23 insertions, 10 deletions
diff --git a/converter/ibm4704_usb/README.md b/converter/ibm4704_usb/README.md
index 1e29945d05..f38cdd164a 100644
--- a/converter/ibm4704_usb/README.md
+++ b/converter/ibm4704_usb/README.md
@@ -3,16 +3,29 @@ IBM 4704 to USB keyboard converter
This firmware converts IBM 4704 keyboard protocol to USB HID.
-Connect Wires
--------------
-In case of Teensy2.0(ATMega32U4):
-
-1. Connect Vcc and GND.
-2. Connect Clock and Data line.
- - Clock is on PD1 and Data on PD2.
-3. Optionally you need pull-up register. 1KOhm is OK?
-
-To change pin configuration edit config.h.
+4704 Connector
+--------------
+ Keyboard Plug from front
+
+ DSUB-9
+ -------------
+ \ N 2 3 4 5 /
+ \ N N N N /
+ ---------
+ 2 GND
+ 3 VCC 5V
+ 4 DATA
+ 5 CLOCK
+ N No connection/No pin.
+
+
+Connection
+----------
+In case of using ATMega32U4(Teensy2.0):
+
+1. Supply power with VCC and GND.
+2. Connect CLOCK to PD1 and DATA to PD2. You can change pin with config.h.
+3. Optionally you may need pull-up register. 1KOhm probably work.
Build Firmware