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Documents, summary and starting instruction set.

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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 |
| :-------: | :------------ | :------------ |