Alright, so here we go...
I designed the card so you can choose between two main configurations. One will lay out all signals the way they are found on the single GAL Daystar IIsi adapter. The equations for said GAL had been found out by Joe in the old thread.
The second configuration will put the signals the way they are on the DiiMo (or Artmix) adapter for the SE/30. I took a guess on the code for the GAL and it seems to work ok for now. The goal might be to get the best out of both worlds and fuse this into a single GAL solution.
The schematics Joe buzzed out have been correct - using just an accelerator worked right out of the box.
Using only PowerCache or Turbo040 works fine with the Daystar setup.
Having the MacCon stuck into the bottom of the stack with the adapter+accelerator on top is working fine with both PC and T040 as well.
Having a second PDS card on top of the whole stack is where things start to get ugly.
Putting in the IIsi Pivot gives garbage on the CRT while the Mac itself still works and even boots fine as seen on the external screen. This seems to be related to the clock signal not being able to drive all the loads that are connected which messes up the timing for onboard video.
I figured that with the DiiMo setup at least the clock signal has to be buffered by the GAL. Not knowing what is going on with the other two signals going through the GAL on the DiiMo I set them up to just get buffered as well as a start. I was surprised that it might have been so easy... The DiiMo configuration worked right away now with the Pivot, however only when using the PowerCache. The Turbo040 won't even POST now with two cards stuck in (it did before with the Daystar config)
Just along the way of fiddling around with jumper wires on the several signals which are broken out at the PLD sockets I discovered that you can run the whole thing without having any GAL at all. You can run at least one PDS card and an accelerator in the SE/30 using only a passive adapter.
Both configurations (or should I count the passive mode as a third one?) seem to work with different variations of PDS cards and accelerators and some combinations are not running super stable. I hope that we can find a setup soon which is running two cards and an accelerator reliably.
The next steps for me will be fiddling with mixing the approaches of the Daystar and DiiMo adapters.
*bonus*
I know what you have been waiting for:
View attachment 20855
It works and fits into the case :evil: