MC_REGA_UIP
while ((mc_read(MC_REGA) & MC_REGA_UIP) != 0)
while (chiptime[MC_REGA] & MC_REGA_UIP)
while (mclock[MC_REGA] & MC_REGA_UIP)
while (mc146818_read(sc, MC_REGA) & MC_REGA_UIP)
if (((*sc->sc_mcread)(sc, MC_REGA) & MC_REGA_UIP) == 0)
while (mc146818_read(sc, MC_REGA) & MC_REGA_UIP) \