Thanks for the replies
I am trying to pin down what is going wrong with an emulated chip compared to the original one. The chip basically switches the 2 upper address lines of an eprom under special circumstances. In a dedicated test board it works fine but in the real board it is failing. Originally I was monitoring all 14 address lines and the Output Enable. I was setting triggers to occur on certain memory locations and it seemed to trigger correctly but the data displayed did not match the trigger conditions. So I then tried to simplify it by just monitoring the 2 upper address lines and the Enable. The trouble is without all the address lines I need to capture a much longer data stream, around 500ms, so that I have enough data to compare the whole boot sequence.
I have been coding since the early 80's, both low level & high level, on embedded micros upto minis, but this is my first time playing with an LA. Scopes and logic are no issue normally for me but so far with this board and software I am not getting what I expected to see. Perhaps I should set it all up again with the full set of address lines and take some screen grabs to show you what I am seeing...
Of course a secondary reason for purchase is to start VHDL coding, its that 'little' something that has been missing from my life