MAXBOARDS
ret = isa_register_driver(&aha1542_isa_driver, MAXBOARDS);
static int io[MAXBOARDS] = { 0x330, 0x334, 0, 0 };
static int bus_on[MAXBOARDS] = { -1, -1, -1, -1 }; /* power-on default: 11us */
static int bus_off[MAXBOARDS] = { -1, -1, -1, -1 }; /* power-on default: 4us */
static int dma_speed[MAXBOARDS] = { -1, -1, -1, -1 };