sm3.lua

function read_file (filename)
  input = io.open(filename, "r") -- Open this file with the read flag.
  if input ~= nil then
    io.input(input) -- Set the input that the io library will read from.
    input_content = io.read() -- Read the contents of the file.
    io.close(input) -- Close the file.
  end

  return input_content
end

function split(pString, pPattern)
  local Table = {}  -- NOTE: use {n = 0} in Lua-5.0
  local fpat = "(.-)" .. pPattern
  local last_end = 1
  local s, e, cap = pString:find(fpat, 1)
  while s do
     if s ~= 1 or cap ~= "" then
    table.insert(Table,cap)
     end
     last_end = e+1
     s, e, cap = pString:find(fpat, last_end)
  end
  if last_end <= #pString then
     cap = pString:sub(last_end)
     table.insert(Table, cap)
  end
  return Table
end

prev_inventory = ''

while true do
  inventory = read_file('inventory.hex')

  if inventory ~= prev_inventory then
    items = split(inventory, ' ')

    memory.writebyte(0x7D80, tonumber(items[1], 16))
    memory.writebyte(0x7D81, tonumber(items[2], 16))
    memory.writebyte(0x7D82, tonumber(items[3], 16))
    memory.writebyte(0x7D83, tonumber(items[4], 16))
    memory.writebyte(0x7D84, tonumber(items[5], 16))
    memory.writebyte(0x7D85, tonumber(items[6], 16))
    memory.writebyte(0x7D86, tonumber(items[7], 16))
    
    prev_inventory = inventory
  end
  
  emu.message('Toimii!') -- Print hello world to the screen on every frame
  emu.frameadvance() -- This essentially tells FCEUX to keep running
end