doc: updated

README.md

@@ -9,59 +9,23 @@ There are a few options available at the bottom of the window. Here's what they
 
 Item|Description
 ---|---
-Key width|Controls how wide the keys are. For my configuration width of 80 matches the in-game UI perfectly.
+Key width|Controls how wide the keys are. 
 Key length|Controls how long (tall) the keys are.
 Sensor height|Controls how tall the IR sensor area is.
 Apply|Apply width & height settings. 
 Opacity|Controls window opacity.
 Allow Mouse|Allow the mouse to interact with virtual keys. The virtual controller only accepts touch control by default. 
 Lock Window|Lock the window in the current position. (disable dragging)
+Coin|Insert coin.
+Service|Service button.
+Test|Test button.
 Exit|Exit.
 
-Downloads are available on the release page.
+### Usage
 
-### Appendix
+Downloads are available on the [release](https://github.com/Nat-Lab/chunithm-vcontroller/releases) page. Replace the "chuniio.dll" in your game folder with the one provided in the zip file. Run ChuniVController.exe, then start the game as you usually would.
 
-If you are using Segatools, here's the cell mapping configuration for the virtual controller:
-
-```
-cell32=0x41
-cell31=0x41
-cell30=0x42
-cell29=0x42
-cell28=0x43
-cell27=0x43
-cell26=0x44
-cell25=0x44
-cell24=0x45
-cell23=0x45
-cell22=0x46
-cell21=0x46
-cell20=0x47
-cell19=0x47
-cell18=0x48
-cell17=0x48
-cell16=0x49
-cell15=0x49
-cell14=0x4A
-cell13=0x4A
-cell12=0x4B
-cell11=0x4B
-cell10=0x4C
-cell9=0x4C
-cell8=0x4D
-cell7=0x4D
-cell6=0x4E
-cell5=0x4E
-cell4=0x4F
-cell3=0x4F
-cell2=0x50
-cell1=0x50
-```
-
-### To-dos
-
-- Handle IO ourselves. Deal with LEDs.
+The modified `chuniio.dll` binds on UDP port 24864 and listens for incoming IO messages. `ChuniVController.exe` connects to it on the localhost. The protocol specification can be found [here](https://github.com/Nat-Lab/chunithm-vcontroller/blob/master/ChuniVController/ChuniIO/chuniio.h). It should be straightforward to create other clients. (e.g., touchscreen tablet client)
 
 ### License