Update README

Author: SukkoPera

README.md

@@ -1,20 +1,24 @@
 # OpenC64MegaDrivePadAdapter
 
-OpenC64MegaDrivePadAdapter is an Open Hardware adapter that allows the safe connection of a Sega Mega Drive (known as *Genesis* in the US) controller to a Commodore 64 computer.
+OpenC64MegaDrivePadAdapter is an Open Hardware adapter that allows the safe connection of a Sega Mega Drive (known as *Genesis* in the US) controller to a Commodore 64 or Amiga computer.
 
 ![Board](https://github.com/SukkoPera/OpenC64MegaDrivePadAdapter/raw/master/doc/render-top.png)
 
 ### Summary
 Despite being compatible at the physical level (i.e.: they use the same DB-9 connectors), Sega Mega Drive controllers are slightly different from the *Atari-style joysticks* (which the C64 uses) at the electrical level. These differences usually manifest themselves in the fact that certain keyboard keys are not responsive when a Sega Mega Drive pad is connected to a C64 computer, but the CIA chip may also get harmed as a result.
 
-To make a long story short, Sega Mega Drive controllers keep the button lines at a logical high level when not pressed, while the C64 expects them to be left floating.
+Since I think that the Sega Mega Drive controller is one of the best joypads which ever saw the light, I developed this simple adapter board, which is supposed to sit inbetween the computer and the controller. You should be able to keep it plugged into the computer and then connect the controller to it, but you can also use a joystick extension cord (widely available), if that makes it easier.
 
-Since I think that the Sega Mega Drive controller is one of the best joypads which ever saw the light, I developed this simple adapter board, which is supposed to sit inbetween the C64 and the controller. You should be able to keep it plugged into the computer and then connect the controller to it, but you can also use a joystick extension cord (widely available), if that makes it easier.
+This adapter also allows using Button C as the second fire button, for those games that support two buttons.
+
+While this all works out of the box on Amiga computers, this adapter also allows to customize the button mapping to a certain degree: for instance, replacing UP with C might make some games more comfortable to play. This might be useful on the Amiga as well, so the adapter also supports an Amiga mode.
 
 ### Configuration
 The board is based on the circuit that was originally published in [issue #5 of Commodore world](https://www.scribd.com/document/8945979/Commodore-World-Issue-05) back in 1994, with a few improvements that will allow an easier gameplay with certain titles.
 
-You have three configuration jumpers that you can use to customize how the C64 interprets button presses on the controller.
+First of all, be sure to move the C64/Amiga jumper to the proper position, before connecting the adapter.
+
+Then you have three more configuration jumpers that you can use to customize how the computer interprets button presses on the controller.
 
 In fact, since most joysticks back in the day only had a single fire button, it was usually used for *firing*, whatever that meant. *Jumping* was usually done with the UP direction of the joystick, which is quite annoying on a joypad.
 
@@ -23,16 +27,16 @@ This is why OpenC64MegaDrivePadAdapter allows you to repurpose the B or C key to
 It also allows to use C as the second fire button, which is only supported by a few titles. You can even swap B and C, if you prefer.
 
 Configuration is done through the jumpers on the board, and should be pretty self-explanatory. There are only two rules which you will have to remember:
-1. **ALWAYS TURN YOUR C64 OFF BEFORE MOVING THE CONFIGURATION JUMPERS.**
+1. **ALWAYS TURN YOUR COMPUTER OFF BEFORE MOVING THE CONFIGURATION JUMPERS.**
 2. **NEVER EVER KEEP MORE THAN ONE JUMPER ON THE SAME HORIZONTAL LINE.**
 
 If you don't follow the rules, **you will probably cause permanent damage to your C64 and/or controller**, so **please be careful**, you have been warned.
 
 The default configuration maps B to button 1, C to button 2 and UP to UP. If you play Giana Sisters, you will probably want to use the C button for jumping, so just do the following:
-1. Turn OFF your C64.
+1. Turn OFF your computer.
 2. Remove the UP/UP jumper and store it in a safe place.
 3. Move the C column jumper to the UP row.
-4. Turn on your C64, load the game and enjoy!
+4. Turn on your computer, load the game and enjoy!
 
 ### License
 OpenC64MegaDrivePadAdapter is Open Hardware.