It seems to be common knowledge by now that the TXBC bit in the UART is not working correctly, (since january 2003) but this is not mentioned in any of the Errata documents for Net+40, Net+50 or in the NS7520. My main question is which processors and revisions that have this bug. Also i have seen that there are documents posted in some forums that is not available through downloads even if they seem to be of common interest.