do
--#include "module/nvt100.lua"
function vtemu(gpua,scra) -- creates a process to handle the GPU and screen address combination *gpua*/*scra*. Returns read, write and "close" functions.
 local gpu = component.proxy(gpua)
 gpu.bind(scra)
 local write = vt100emu(gpu)
 local kba = {}
 for k,v in ipairs(component.invoke(scra,"getKeyboards")) do
  kba[v]=true
 end
 local buf, lbuf, echo = "", true, true
 os.spawn(function() dprint(pcall(function()
  while true do
   local ty,ka,ch = coroutine.yield()
   if ty == "key_down" and kba[ka] then
    if ch == 13 then ch = 10 end
    if ch == 8 then
     if buf:len() > 0 then
      if echo then write("\8 \8") end
      buf = buf:sub(1,-2)
     end
    elseif ch > 0 then
     if echo then write(string.char(ch)) end
     buf=buf..string.char(ch)
    end
   end
  end
 end)) end,string.format("ttyd[%s:%s]",gpua:sub(1,8),scra:sub(1,8)))
 local function bread(n)
  local r
  if lbuf then
   while not buf:find("\n") do
    coroutine.yield()
   end
   local n = buf:find("\n")
   r, buf = buf:sub(1,n), buf:sub(n+1)
  else
   r = buf
   buf = ""
   coroutine.yield()
  end
  return r
 end
 local function bwrite(d)
  local ba, lb, ec = write(d)
  buf = buf .. ba
  if lb ~= nil then
   dprint("local buffer mode: "..tostring(lb))
   lbuf = lb
  end
  if ec ~= nil then
   dprint("echo mode: "..tostring(ec))
   echo = ec
  end
 end
 return bread, bwrite, function() io.write("\27[2J\27[H") end
end
end