(+) sim-tst
(>) TM_INPUT_*, TM_SNAP, IIOTM, ok=>ok_seek, TM_DELAY
(>) TM_SNAP_*, TM_QUEUE_*, dt=0
(-) bug TM back & ticking
(>) TM: FRAME=>REDRAW, tceu_queue_dt (less space)
(>) TM: backward tick
(-) deterministic rand