CB1_INT
out_8(&via1[IER], CB1_INT | IER_CLR);
out_8(&via1[IER], CB1_INT | IER_SET);
intr = in_8(&via1[IFR]) & (SR_INT | CB1_INT);
intr = CB1_INT;
if (intr & CB1_INT) {
out_8(&via1[IER], IER_SET | SR_INT | CB1_INT);
out_8(&via1[IER], IER_SET | SR_INT | CB1_INT);