You reduced pullups on address lines to 4K7? Whats the pullups on data line?
Is you MMU socketed?
I know that I tried the mod with chipsets taken from MSTs, but found out that older chipsets from 520/260 work better for me.
MMU cannot assert reset so who can? Whats the state of /BERR before the reset?
On my 1040STFM schematics I see that A1..A23 are pulled high with 10K and A1..A16 are pulled low with 4K7.
That's not the case on my 260/520 schematics (only pullups).
My MMU is in a socket, I actually put everything back to default and found the Shifter had died. So currently its back to that odd ghosted image (DE is not sorted at this point). It seems to give 1 or 2 bombs just before is resets.
I have not changed the pullups, simple due to the STs have been running with other 16mhz mods without changing them. Possible it could be aproblem with the MMU needed better pull ups. I will have to order some Monday.
The HC CPU I tried, I had to pull down instead of pull up for it to work. Though think they are all pull ups on the actual board by default.
I've not changed the reset resistors, wasn't really sure if there was any point as the machine boots up (kinda) anyway ?
I'm at a loss with this currently. I can put the DE mod back on, but last time I tried it, it made the video worse. At least at the moment I can see something going on. I've tried fiddling with all sorts, but currently the only find is the 32mhz does need to be inverted. If I run it via 2 inverters, not much happens, just white screen.
I'm taking the 4mhz line off the MMU, which is now 8mhz, running it via he flipflop for 4mhz, feeding that into the MFP. Thats all I have done. So it should be pretty much the same as your mod
DE OP... I cut the line right next to the MMU, so only that was feed from the AND gate. Though that part isn't connected up anyway. I assume you can get to desktop if you just connect GLUE DE to MMU DE directly (without AND) and you get that double image thing, with corruption on the bottom half of the screen.. but can actually get to desktop ?