hi,

Your inputs become more and more brillant and it's a joy to read them!

I just try to increase my carma (=

Seriously, the history is not secret.
In one of my projects, it happened that /WR signal was delayed (slow CPLD + buffer etc). Destination was the dynamic register (574) which had read-back loop for control purposes. Well, during tests I found that sometimes it contains not that value which program have wrote in it. Looking at those values once and once I discovered that they are low bytes of PC (oh well, it took me some time to recognize this fact). I was not understanding how might hardware know about value of program counter which is internal really! With this "suprize" I came to datasheets and finally found description of this "feature".

Regards,
Oleg