RSR_BREAK
if (ISSET(rsr, RSR_BREAK)) {
lsrmap[(rsr & (RSR_BREAK|RSR_FERR|RSR_PERR)) >> 3];
if (ISSET(rsr, RSR_BFULL|RSR_BREAK)) {
for (; ISSET(rsr, RSR_BFULL|RSR_BREAK) && cc > 0; cc--) {
if ((rsr & RSR_BREAK) && (MFP->mf_rsr & RSR_BREAK))
while (ISSET(rsr, RSR_BFULL|RSR_BREAK)) {