PLC_REV_MASK
((inpw(PLC(np,PL_STATUS_A)) & PLC_REV_MASK) ==
rev = inpw(PLC(p,PL_STATUS_A)) & PLC_REV_MASK ;
plc_rev = inpw(PLC(np,PL_STATUS_A)) & PLC_REV_MASK ;
if (((inpw(PLC(np,PL_STATUS_A)) & PLC_REV_MASK) !=