ASC_READ_REG
tcl = ASC_READ_REG(asc, NCR_TCL);
tcm = ASC_READ_REG(asc, NCR_TCM);
(resid = (ASC_READ_REG(asc, NCR_FFLAG) & NCRFIFO_FF)) != 0) {
resid += (tcl = ASC_READ_REG(asc, NCR_TCL));
resid += (tcm = ASC_READ_REG(asc, NCR_TCM)) << 8;
return ASC_READ_REG(asc, reg);
return (ASC_READ_REG(asc, NCR_STAT) & NCRSTAT_INT) != 0;