TODO.md

High priority:

• implement all commands marked as TODO

• manually check their correctness (wip)

• add unknown_opcode(x) function

• add rand() simple implementation

• add chip8_tick() function

• add main cycle
  using sysfn 23 wait event with timeout 0.05 sec,
  check which event,
  if event none, then check how much time passed since the previous tick,
  if passed >= CLOCK_MS then make tick and redraw if redraw flag is up (if so, redraw and set flag down after redraw) (?)

• add drawing procedure, which renders gfx array to the actual scren

• add missing opcodes implementation !!!

• !!! remake keyboard processing using SCANCODE mode (not ASCII like now):
  in main cycle process also keyboard events:
  keydown and keyup
  on keydown mark key with 1 in array, on keyup mark with 0

• make graphics faster !
  maybe use double buffering (i.e draw image in internal buffer and then send it to the screen using one syscall)

• fix Page fault when running tests/tetris1

• fix the follwing bug:
  when intro of roms/invaders1.ch8 is playing, moving (or just activating it) the emulator's window causes crash (maybe PF).

Low priority:

• in commands 5xy0, 9xy0 need to check if last digit is 0 or not . (?)
• add debug output for each command
• add more comments
• add more tests