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now explain why it's called dd not cc

https://68kmla.org/bb/index.php?threads/how-to-repair-a-powerbook-140-180-interconnect-cable.46387/ You can use an 80-conductor Ultra ATA cable

Or you could buy the Relatively Universal ROM Programmer for $12 if your wallets aren't overflowing Since I own one I could bake you a special pair of ROMs @Brutus75

We know GAL 7 is a clock doubler, but can it be modified to be a clock quadrupler? A stock Plus runs at 8MHz, so times four that's 32MHz

Iteration #2... FPU socket has been erased. Still need to fix some bugs in the silkscreen and via placement in order to pass DRC but this is basically what the finished board should look like. JLCPCB will mint 5 of these for $7. Is there a guide for avoiding fake 68030s?

I would make sure the new EEPROM is the same speed or faster than the one you're replacing.

The correct choice would be a 1 Mbit EEPROM.

I'm considering cutting the FPU from my board, I doubt most programs use it. (Which ones do?)

https://www.imania.dk/relatively-universal-rom-programmer.htm Gerber files for the Rominator are available, but not the schematics. I would ask the vendor for them. If they can't provide you with schematics, I would be happy to draw them for you from the Gerber files.

The inverse of this is the fact that you can boot NetBSD on a 68020 and beyond, but not on a 386

My board is intended to be easy to assemble, without having to solder dense surface mount packages. If you want QFP I'd say do it yourself, if I can do what I've done here then you can too. What is this pattern called? I want to attach a via to the ground plane like these holes have been...

I think that a 68000 replacement should work in all 68000 based computers

I've just jumped right in to KiCad without sitting down and learning anything about it for any significant amount of time

Thanks for sharing that :) I would instantly throw away all my "work" and just get that PCB made but I refuse to surface mount solder PLCC sockets I already tweaked my board's layout again to the point where an autorouter can complete it

I thought I'd get myself to learn PCB design by modifying Bolle's MicroMac Performer clone to remove the PDS slot and Classic CPU socket, thereby specializing the upgrade for a Macintosh Plus only. I started from this repository which has several KiCad projects you can just open right up...

I want to spend an hour on the tower of power

I applaud your choice of soundtrack :) For those curious, the Motorola 68060 is roughly equivalent to the original Intel Pentium. Guess which one is more performant though