sym_sist0
inb(sym_sist0);
inw(sym_sist0); /* clear pending scsi interrupts */
inw(sym_sist0); /* another one, just to be sure :) */
inb(sym_sist0); // apparently we MUST read sist0 as well
sist0 = inb(sym_sist0) & 0x8f;
inb(sym_sist0);
inb(sym_sist0);
inb(sym_sist0);