p->pivr = vect;
    p->pgcr = 0x3f;    /* modo o H12 e H34 abilitati. H1,H2,H3,H4 -> asseriti
    p->psrr = 0x18;    /* interrupts vettorizzati */
    p->pacr = 0x80;    /* port A: submodo 1X */
    p->pbcr = 0x80;    /* port B: submodo 1X */
/*    p->padr = 0xff;    /* port A: initial value: 0xff  ( all outputs zero )*/
/*    p->pbdr = 0xff;    /* port B: initial value: 0xff  ( all outputs zero )*/
    p->paddr = 0xff;   /* port A: define PIT as output */
    p->pbddr = 0xff;   /* port B: define PIT as output */