MC_REGB_SET
chiptime[MC_REGB] |= MC_REGB_SET; /* enable write */
chiptime[MC_REGB] &= ~MC_REGB_SET; /* load them up */
(mc146818_read(sc, MC_REGB) | MC_REGB_SET));
(mc146818_read(sc, MC_REGB) & ~MC_REGB_SET));
(mc146818_read(sc, MC_REGB) | MC_REGB_SET));
(mc146818_read(sc, MC_REGB) & ~MC_REGB_SET));
(*sc->sc_mcread)(sc, MC_REGB) | MC_REGB_SET);
(*sc->sc_mcread)(sc, MC_REGB) & ~MC_REGB_SET);
mc146818_read(sc, MC_REGB) | MC_REGB_SET); \
mc146818_read(sc, MC_REGB) & ~MC_REGB_SET); \