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Thanks to @moldy for sending this over for testing! I got this installed in my SE/30 last night and it works great! It's paired with an Asante MacCon and pinout seems to work. For mounting, I had some M3 screws/nuts on hand and seem to work fine. It's a bit fiddly trying to hold everything in...

Hey just throwing in my two cents -- I just experienced this on my board and was able to fix by making sure the ADB (UL11) was good. As I understand it's also possible for bad connections to the SWIM or SCSI to cause this. Might be worth checking those lines if you haven't yet. Best of luck!

For anyone following, looks like the problem here was a combination of bad joints on the UH7 PAL and the UK12 VIA. Now to figure out why my ADB devices aren't working...

Thanks for documenting your build and results with the 25MHz oscillator. I just finished this build myself and this helped me decide to leave the oscillator out although I agree it looks nicer installed. I wanted to note for prospective builders that ATF16V8C-5JX worked for me as PALs for U3-U6...

Just tried swapping in the set of four into the first four slots from my working SE board but getting the same symptoms unfortunately. Tried another set that I haven’t used in awhile as well. I think I’ll have to check this area more closely with my scope. Where can I find the ROM source?

Hmm great tip, I hadn’t hooked up the speaker yet. I get a boot chime then immediately a death chime loud and clear. I guess the problem must be after the ROM checksum succeeds?

Thanks for your comment, unfortunately although some of these lines (A25-31, which represent the 26th-32nd highest bits -- SE/30 VRAM begins at $FE00 0000) have activity, it doesn't look like they are all high at the same time (some never go high). UJ6 is just a simple 8 input NAND (74LS30)...

Thanks for the suggestion, I just gave this a shot but no dice. All data and address lines are good between the CPU and ROM. I should mention that this is a rebuild using Bolle's SE/30 design, and I'm using a ROM-inator II slotted in a ROM slot is sized for a standard SIMM. Tried with the stock...

My board is once again presenting a simasimac pattern on boot. Poking around the board with a scope I can see activity on address lines and data lines, but I noticed that the CPU never addresses into VRAM (pin 8 of UJ6 never goes low) and I'm guessing that's why the /WE pin on the VRAMs never go...

This is the Mouser part I used which worked for me: https://www.mouser.com/ProductDetail/437-1158742441003101

I recently picked up my first vintage Macintosh, an SE/30 sold as-is and received it today. To my dismay, the board was swapped at some point with an SE board. I want to try and pick up a loose SE/30 board soon, but now that I know the board has been swapped I'm not sure how much the rest of the...