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 # Computer
 
+----------
+
+## Summary
+
+1. [Aims and challenges](#aims-and-challenges)
+2. [Architecture choices](#architecture-choices)
+3. [Design](#design)
+    1. [The instruction set.](#the-instruction-set)
+
 ## Aims and challenges
 
-Make a fully functionnal computer from scratch.
+Make a turing complete computer from scratch.
 
 The computer will be composed of :
  - A CPU
  - Some RAM
  - Some ROM
- - A controller to the system, a "bios".
 
 At first every part will be the "industrial" version :
- - The CPU made with an (2) ALU IC (74181 ?)
- - The RAM a chip (UM61256BK-20 from 1993)
- - The ROM another chip (D27C010 from 1986 !)
+ - The CPU from logic gates.
+ - The RAM a [SRAM](https://en.wikipedia.org/wiki/Static_random-access_memory) chip (*[UM61256BK-20](/Documents/UM61256.pdf) from 1993*)
+ - The ROM another chip (*[D27C010](/Documents/D27C010-200V10.pdf) from 1986 !*)
 
-Then the aim is to replace them with made from scratch versions. 
+Then the aim is to replace them with made from scratch versions.
 For the moment only the RAM is meant to be replaced with homemade magnetic core RAM.
 
 ## Architecture choices
 
-The computer is in 8 bits since the ALU, RAM and ROM are meant to be in 8 bits.
-The CPU have ports for inputs / outputs.
+The computer will be in 8 bits since the RAM and ROM are meant to be in 8 bits.
+The CPU will have ports for inputs / outputs.
+
+## Design
+
+The design is inspired of great people hard work :
+ - [Ben Eater's 8 bits breadboard computer](https://eater.net/8bit)
+ - [Mattbatwings's minecraft computer tutorial](https://youtu.be/hAZEXqWLTmY?si=qgic0b28PMeOPs_l)
+
+### The instruction set.
+
+Every instruction is 8 bits long. And there is 3 bytes of data after the instruction.
+Because the ROM is 8 bits, every instruction will take 4 bytes.
+This property might help for [instruction pipelining](https://en.wikipedia.org/wiki/Instruction_pipelining) in the future.
+
+These are only real instructions. Pseudoinstruction will be defined later.
+
+| Mnemonic  | Description   | Pseudocode    |
+| :-------: | :------------ | :------------ |