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README.md

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 # otlchip8x
 Cross platform chip8 emulator/interpreter
+
+## Install
+Look at the releases or download source codes from here:
+
+For windows x64:
+
+1) Extract zip file in a folder or download .exe file, download SDL.dll from their SDL website
+2) drag and drop a chip8 rom
+3) Change created config file as needed
+
+For linux:
+
+1) Extract source code (main.cpp main.h in a folder)
+2) Libraries needed to compile: 
+```
+sudo apt-get install libsdl2-dev g++
+```
+3) Compile:
+```
+g++ -o otlchip8x main.cpp `sdl2-config --cflags --libs`
+```
+4) Provide rom as argument to otlchip8x or drag and drop if feature available
+```
+./otlchip8x "<your_rom_file_(name|path)>"
+```  
+5) Change configuration file as needed
+
+## Roms:
+
+Huge collection of roms hosted by [Kripod](https://github.com/kripod/chip8-roms)
+
+Some tests by [Timendus](https://github.com/Timendus/chip8-test-suite)
+## Keymap
+QWERTY(or same key position as QWERTY)  => Hex Value recognized by Chip8
+```
+1 2 3 4 => 1 2 3 C
+Q W E R => 4 5 6 D
+A S D F => 7 8 9 E
+Z X C V => A 0 B F
+```
+```
+ESC key   :  quit
+Backspace : reset/refresh/reload, any change in configuration will be loaded.
+```
+## Configuration
+```
+ENABLE_DELAY    : enable or disable emulation speed(cpu frequency) limit
+FREQUENCY_CPU   : cpu frequency limit to use if delay enabled
+SCALE_FACTOR    : length of a square pixel on the window. 64x32 pixels displayed on window.
+FRAME_RATE      : Display update rate. Frames per seconds
+CHIP_MODE       : 1)COSMACVIP, 2)CHIP48, 4)SUPERCHIP, only some difference inplemented :: Flag register update, Index register update, etc
+```
+## Tips
+1) Space Invaders : change CHIPMODE to 2 or 4 in configuration file.