local machine = manager.machine
local cpu = machine.devices[':maincpu']
local dbg = machine.debugger
local prog = cpu.spaces['program']
local rd = function(a) return prog:read_u16(a) end
local last={}
local keys={ ISR=0x06400050, IMR=0x06400050, ACR=0x06400040, CUR=0x06400060 }
local n=0
emu.register_frame_done(function()
  n=n+1
  local isr=rd(0x06400050) & 0xff
  if last.isr~=isr then print(string.format("f%4d ISR=%02X ACR=%04X", n, isr, rd(0x06400040))); last.isr=isr end
  if n>=520 then machine:exit() end
end,"ctr")
dbg.execution_state='run'