chip/docs/todos.md

Todos

• How to capture arguments passed to a C program

  ```c
  // argc is the number of args passed
  // argc is always 1 or more
  // argc always has name/path of program as first arg
  int main(int argc, char *argv[]) {
  // do stuff with the args
  }
  ```
  

• How to print argument value

  ```
  printf("%s", argv[1]);
  ```
  

• Read a file

  ```c
  // open file in read mode. returns NULL if doesn't exist
  FILE *file_ptr = fread(file_path, "r");
  
  // seeking to end of file.
  // useful telling number of bytes
  fseek(file_ptr, 0, SEEK_END);
  
  // get number of bytes
  int num_of_bytes = ftell(file_ptr);
  
  // seek to begin of file
  fseek(file_ptr, 0, SEEK_SET);
  ```
  

• Store contents of file in memory

• Print file contents

• Print instructions

• Make sure program occupies correct space in chip memory

• Parse individual instructions from binary CHIP-8 file

• Print all instructions from CHIP-8 file

• Write all CHIP-8 IBM logo opcodes to CSV file

• Implement opcodes present in the IMB logo CHIP-8 file

  x	Opcode	Type	Description
  x	00E0	00E0	Clear display
  x	1nnn	1nnn	Jump to address
  x	3xkk	3xkk	Skip next if Vx == kk
  x	6xkk	6xkk	Load register with immediate
  x	7xkk	7xkk	Add immediate to Vx
  x	ANNN	ANNN	Set index register
  x	Bnnn	Bnnn	Jump to V0 + addr
  x	Dxyn	Dxyn	Draw sprite

• Refactor main

• Migrate drawing to raylib window

• Handle keyboard input

• Implement remaining instructions

  x	Opcode	Type	Description
  x	00EE	00EE	Return from subroutine
  x	2nnn	2nnn	Call subroutine at nnn
  x	4xkk	4xkk	Skip next if Vx != kk
  x	5xy0	5xy0	Skip next if Vx == Vy
  x	8xy0	8xy0	Stores Vy in Vx
  x	8xy1	8xy1
  x	8xy2	8xy2
  x	8xy3	8xy3
  x	8xy4	8xy4
  x	8xy5	8xy5
  x	8xy6	8xy6
  x	8xy7	8xy7
  x	8xy8	8xy8
  x	Cxkk	Cxkk