DS1337_BIT_A1I
if (stat & DS1337_BIT_A1I) {
stat &= ~DS1337_BIT_A1I;
t->pending = !!(regs[8] & DS1337_BIT_A1I);
regs[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I);