They look fine there. Though you would have to sample a few seconds and look at every "page" to look for a glitch. I will try and post a example when I get home later of what I mean.
You could try this... basically similar to using another FF.. if you have a spare few inverter gates... run the MB DTACK line via sets of 2 inverter and run them to the CPU DTACK PIN. (lift DTACK pin out of socket)
Then DTACK will run though 2 NOT gates, basically just creating a delay of 2 gates worth. So about 10ns per gate, 2 gates 20ns total. Though try 2 gates, boot up see if things improve.. then try another 2 gates for 40ns delay.. then another 2 gates for 60ns delay.
EDIT..
This shows what the LA can sometimes show , as it does on ST_DTACK..
- efbdecei.jpg (149.26 KiB) Viewed 5911 times