BF machine

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A hardware realization of Brainfuck.

For a machine to be classed as a BF machine, it must:

  • Have a 320x240 1-bit screen
  • Run standard BrainFuck programs, with these additions:
@  Flip the pixel at the position in the current cell
?  Store the current state of the pixel at the position in the current cell in the current cell
$  Get one keypress (NOT character, but single keydown) and store its value in the current cell (some sort
   of mapping of keys -> numbers is needed here)
  • Cells can store unsigned values up 76799, and produce an error instead of wrapping

Prizes for whoever makes the first program to draw a hollow circle in this.