TS_ERASE
if (!ISSET(tp->t_state, TS_ERASE)) {
SET(tp->t_state, TS_ERASE);
CLR(tp->t_state, TS_ERASE);
if (ISSET(tp->t_state, TS_ERASE)) {
CLR(tp->t_state, TS_ERASE);
#define TS_LOCAL (TS_BKSL | TS_CNTTB | TS_ERASE | TS_LNCH | TS_TYPEN)
{ TS_ERASE, 'E'},