NULL_SIGNAL = {signal = { type = "virtual", name = "signal-black" }, count = 0}
HALT_SIGNAL = {signal = { type = "virtual", name = "signal-mc-halt"}, count = 1}
RUN_SIGNAL = {signal = { type = "virtual", name = "signal-mc-run"}, count = 1}
STEP_SIGNAL = {signal = { type = "virtual", name = "signal-mc-step"}, count = 1}
SLEEP_SIGNAL = {signal = { type = "virtual", name = "signal-mc-sleep"}, count = 1}
JUMP_SIGNAL = {signal = { type = "virtual", name = "signal-mc-jump"}, count = 1}
OP_NOP = {type = 'nop'}
MC_LINES = 32