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Correct. The data lines on the PLCC32 sockets on my logicboard are reversed because otherwise routing them in the tight available space would have been really messy. Turning the sockets around would have caused issues with the address line routing, so simply inverting the bit order for each...

You'll need separate surface mount machined pins like those: https://www.mill-max.com/products/new/tape-reel-packaged-smt-pin

Yep... This coupled with that thing:

I think a 50MHz PowerCache will be faster due to the cache that most of the other fast SE accelerators lack. The PowerCache adapter for the SE also comes with RAM which is hanging on to a fast 33MHz bus on the adapter itself. I think the PowerCache when used in an SE benchmarks faster than when...

At least that's what it says there. I do have both, the Quik30 as well as the Gemini Ultra (branded Extreme Systems) and they both do have sound issues when used with Gemstart - it's just not as bad as with other drivers but it's still there. What's interesting is that with less crackles and...

You can also use this: https://macintoshgarden.org/apps/total-systems-enterprise-030-driver That's what came on the hard drive of an LC I got with that accelerator in it.

That's a simple PDS angle adapter for the IIsi, so you can use fullsize PDS cards in it. I'd issue a guess that the giant SIMM socket was there for a proprietary cache card.

Getting there... already started ordering PCBs for playtime in the upcoming winter season.

Also curious how that thing benchmarks against an accelerator with 50MHz and cache - DiiMO or PowerCache

Looks like he has different options for auxiliary power supply boards... the blue one takes a floppy drive power connector, the red one contains a stepdown module to provide power through an external power brick. I was looking into doing something similar but use the usually pretty beefy 12V...

Have you checked the voltages? The power supply might be bogging down with the extra load of an extra accelerator. A lot of Plus accelerators back then came with extra power supplies for that same reason. Either way schematics in case you want to check your accelerator against them: (the...

What's wrong with it? Did it get SE/30 PDS'd like the one I once repaired for @JDW?

On the SE/30 it's done in a similar fashion. The "analog GND" as it's called on the schematics is connected to the main/digital ground through inductors.

I do have one of them. They are not programmable ICs at all. HALs are the mask programmable variant of PALs. No sure if they even contain the the required logic to be read. I don't think they do. But at least all states are clearly visible and only change every clock cycle. L-type combinatorial...

Worth a try, I've got an old programmer that still does all sorts of PALs. If we get one of those thingies my way I can give it a try (and take a look at manually recreating some code if it's locked) Unless porchy wants to take a look, figured that might be easier from a shipping point of view.

Got any other Nubus card you could try in the IIsi? There's a cap on the IIsi adapter which when it's leaking can eat through nearby traces resulting in the Nubus slot not working. Have seen that on two or three adapters now already that needed a trace or two repaired to come back to live.

Did you swap the neck board with the CRT? Smearing can be caused by a bad transistor on the CRT amplifier.

Regarding cracking the PLDs, yes. Partially done with noodling out the schematics and looking into how to route this thing so I won't need an 8 layer board.

Done already... The original is an 8 layer board, I imagine it's no fun at all routing the whole address and data busses through that narrow area on the board between host socket and CPU. Got one of those too. You can swap the crystal for one with 100MHz and it will happily run the CPU at 50MHz.

Yep, you're right, filament is powered right from 12V.