First commit. Files moved from ComputerCraft, not yet working at all.

.gitignore

@@ -0,0 +1 @@
+games

debug.lua

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+dofile("/gameboy/z80.lua")
+dofile("/gameboy/rom_header.lua")
+dofile("/gameboy/graphics.lua")
+dofile("/gameboy/input.lua")
+
+args = {...}
+
+filename = args[1]
+file = fs.open("/gameboy/games/"..filename, "rb")
+if file then
+  print("Reading cartridge into memory...")
+  cart_data = read_file_into_byte_array(file)
+  print("Read " .. math.ceil(#cart_data / 1024) .. " kB")
+  print_cartridge_header(cart_data)
+else
+  print("Couldn't open ", filename, " bailing.")
+  return
+end
+
+write("Initializing main memory...")
+initialize_memory()
+print("Done!")
+
+initialize_graphics()
+
+write("Copying cart data into lower 0x7FFF of main memory...")
+for i = 0, 0x7FFF do
+  memory[i] = cart_data[i]
+end
+print("Done!")
+
+function print_register_values()
+  local c = reg.flags.c == 1 and "c" or " "
+  local n = reg.flags.n == 1 and "n" or " "
+  local h = reg.flags.h == 1 and "h" or " "
+  local z = reg.flags.z == 1 and "z" or " "
+  write(string.format("AF: 0x%02X 0x%02X - ", reg.a, reg.f()))
+  print(string.format("BC: 0x%02X 0x%02X  ", reg.b, reg.c))
+  write(string.format("DE: 0x%02X 0x%02X - ", reg.d, reg.e))
+  print(string.format("HL: 0x%02X 0x%02X", reg.h, reg.l))
+  write(string.format("[%s %s %s %s]   ", c, n, h, z))
+  print(string.format("(HL): 0x%02X", read_byte(reg.hl())))
+  write(string.format("PC: 0x%04X  (PC): 0x%02X  ", reg.pc, read_byte(reg.pc)))
+  write(string.format("NN: 0x%02X 0x%02X ", read_byte(reg.pc + 1), read_byte(reg.pc + 2)))
+  write(string.format("(0x%02X 0x%02X)", read_byte(reg.pc + 3), read_byte(reg.pc + 4)))
+  print(string.format("SP: 0x%04X  (SP): 0x%02X 0x%02X %d %d", reg.sp, read_byte(reg.sp), read_byte(reg.sp + 1), read_byte(reg.sp), read_byte(reg.sp + 1)))
+  print(string.format("Clock: %d", clock))
+  print(string.format("GPU: Mode: %d Scanline: %d", Status.Mode(), scanline()))
+  print(string.format("Halted: %d  IME: %d  IE: 0x%04X  IF: 0x%04X", halted, interrupts_enabled, read_byte(0xFFFF), read_byte(0xFF0F)))
+  print("[Space] = Step | [K] = Run 1000")
+  print("[R] = Run Until Error or Breakpoint")
+  print("[V] = Run Until VBlank")
+  print("[H] = Run until HBlank")
+  print("Draw: [T] Tiles, [B] = BG, [W] = Window, [S] = Sprites, [D] = Entire Screen")
+end
+
+print("Press [Enter] to begin execution.")
+read()
+
+function run_one_opcode()
+  update_graphics()
+  update_input()
+  return process_instruction()
+end
+
+term.clear()
+term.setCursorPos(1,1)
+print_register_values()
+char = ""
+while char ~= "q" do
+  event, char = os.pullEvent("char")
+  if char == " " then
+    run_one_opcode()
+    term.clear()
+    term.setCursorPos(1,1)
+    print_register_values()
+  end
+  if char == "k" then
+    for i = 1, 1000 do
+      process_instruction()
+      update_graphics()
+    end
+    term.clear()
+    term.setCursorPos(1,1)
+    print_register_values()
+  end
+  if char == "r" then
+    count = 0
+    while run_one_opcode() do
+      count = count + 1
+      if count >= 20000 then
+        term.clear()
+        term.setCursorPos(1,1)
+        print_register_values()
+        --draw_tiles()
+        draw_background()
+        os.sleep(0)
+        count = 0
+      end
+    end
+    term.clear()
+    term.setCursorPos(1,1)
+    print_register_values()
+  end
+  if char == "h" then
+    old_scanline = scanline()
+    while old_scanline == scanline() do
+      run_one_opcode()
+    end
+    term.clear()
+    term.setCursorPos(1,1)
+    print_register_values()
+  end
+  if char == "v" then
+    while scanline() == 144 do
+      run_one_opcode()
+    end
+    while scanline() ~= 144 do
+      run_one_opcode()
+    end
+    term.clear()
+    term.setCursorPos(1,1)
+    print_register_values()
+    draw_tiles()
+  end
+  if char == "t" then
+    draw_tiles()
+    print("Drew Tiles")
+  end
+  if char == "b" then
+    draw_background()
+    print("Drew Main BG")
+  end
+  if char == "w" then
+    draw_window()
+    print("Drew Window")
+  end
+  if char == "s" then
+    draw_sprites()
+    print("Drew Sprites")
+  end
+  if char == "d" then
+    debug_draw_screen()
+    print("Drew entire screen!")
+  end
+end