implement lexical analysis function for c-minus

notes/1.md

@@ -1,9 +1,41 @@
-컴파일러 1
-===
+# ISA & Compiler Basics
+
+## Basic Computer
+
+To get a task done by a general-purpose computer, we need:
+
+* Program: A sequence of instructions
+* Instruction set: A set of possible instructions
+
+### Von Neuman Architecture
+
+Both Instructions and data are stored in the memory.
+Instructions dictate:
+
+1. which and how data are manipulated
+2. which instruction should be next
+
+The memory is independent of the CPU.
 
 
-# Interpreter in Modern Processors
+### How to load a program
+```
+*.c -(compiler)-> *.s: Assembly program
+*.s -(assembler)-> *.o: Object file 
+*.o -(linker)-[with library(*.o)]-> *.exe: Executable
+*.exe -(loader)-> to in memory 
+```
 
+### Program
+
+Computer is essentially a complex state machine.
+**programmer visible state**:
+
+* Memory
+* Registers
+* Program Counter
+
+Instructions(Program) specify how to transform the values of programmer visible state.
 
 # Compiler