GRREAD
gcreg = GRREAD(sc, GR_GC);
SIISATANAME(sc), __func__, GRREAD(sc, GR_GC)), DEBUG_FUNCS);
__func__, GRREAD(sc, GR_GC)), DEBUG_FUNCS);
GRWRITE(sc, GR_GC, GRREAD(sc, GR_GC) | GR_GC_PXIE(chp->ch_channel));
while ((is = GRREAD(sc, GR_GIS))) {
gcreg = GRREAD(sc, GR_GC);