KCS_STATE_MASK
if ((v & (KCS_OBF | KCS_STATE_MASK)) == (KCS_OBF | KCS_WRITE_STATE))
if ((v & KCS_STATE_MASK) == KCS_ERROR_STATE) {
return v & KCS_STATE_MASK;
printf(" STS: %2x\n", v & KCS_STATE_MASK);