I said "Of course, if you see fit to make personal attacks in that post I may change my mind."
I thought so

You always ignore their complaints that they can't get the parts you think they should use, and, since they are asking about how to do what they want to do with the parts that they want to use, they're not interested in your favorite bleeding-edge technology.
a) I do not "ignore their complaints" and I do not use "bleeding-edge technology". I do, however have one heck of a problem when you post "here is how" without even mentioning that the method is outdated. So, you can se my "you are using an antique" as a response balancing your "help" to make it clear that Richard does not describe current technology in his "helpful" post.

It's not helpful to tell them they are trying to do something that's wrong in itself, e.g. interface an LCD via the 8255 on their old-technogy 805x board.
It is DEFINITELY "not helpful to tell them" that what they are 'learning' is of any use in todays world. *There have been several posts from graduates of such courses that indicated that they thought such old technology was state of the art and thus to be used in the new products they were 'designing'.

They often have a DIP-40 or PLCC-44 MCU on board, so recommending they change to an SMT part doesn't help them. They often don't have the resources to replace half of what is already on hand. Nevertheless, YOU insist on telling them what they probably already know, namely that there may be other ways of doing what they're supposed to do. Listening to your rants won't get their work done by Tuesday next, though.
No, that may be so, but, at least, they will be aware of what they are doing. Also, I often recommend the P89C668 and the LPC series which all are available in socketable versions.

also what they probably already know has been shown in posts like described above (at *)

You won't discuss the technical issues
TOTAL ABSOLUTE BULLSHIT!!!! just look at my posts in a thread like http://www.8052.com/forum/read.phtml?id=131719. Yes, you are right, I do not "help doing it wrong". If someone want to make a '51 run non-permanent code I post "wrong processor", if someone want to make a USB master, I post "chips available, but not as a '51". No, I do not "help" if I see such "help" as not being helpful. If someone post I need it tomorrow and the solution is to buy a chip, is it my problem that he sat on his behind for months before realizing what was needed? Your attitude is "if he wants to hang himself I will help him find the rope".

If your rant above is "discussing technical issues", them the moon is made of green cheese.

This should just about balance your post above so
NOW, what about anawering the technical point I have raised re periodic cycle stretching (speed change) and the potential problems caused by the variance in interrupt latency it generates. Is the rant above because you can not respond to technical issues? If you could, without hiding behind "give me examples", then this thread would have bneen over long ago.

Erik