I just finished cleaning, recapping, and reassembling an SE. It had a MicroMac MultiSpeed accelerator in it when I got it. The machine boots to the '?' disk without the accelerator installed. With the accelerator installed, I get this:
![PXL_20220627_001558110.jpg PXL_20220627_001558110.jpg](https://tinkerdifferent.com/data/attachments/5/5993-4d781eda3dbbb8f5d57b101fd11d091d.jpg)
So I'm guessing one of the SIMMs is bad (I think there are four 1MB SIMMs installed on the accelerator), or there's another fault somewhere. I did replace all 13 surface-mount capacitors on the accelerator, so maybe one of the replacements isn't making a good connection or is bridged, but I doubt it. A couple of the old caps did look like they leaked a little bit, but nothing catastrophic or visible until after they were removed, and none of the nearby traces looked broken. Anyone have any idea where to start with troubleshooting this? I could start removing SIMMs, but I *think* that jumper block above the ROM chip may be for configuring the amount of installed RAM, and I can't find the manual for this thing anywhere.
![PXL_20220627_004907051.jpg PXL_20220627_004907051.jpg](https://tinkerdifferent.com/data/attachments/5/5994-f020ca2e6c072c66e11599f0d296fa10.jpg)
![PXL_20220627_004918331.jpg PXL_20220627_004918331.jpg](https://tinkerdifferent.com/data/attachments/5/5995-b43c8b4a0ebbc405596450883bc519ab.jpg)
![PXL_20220627_001558110.jpg PXL_20220627_001558110.jpg](https://tinkerdifferent.com/data/attachments/5/5993-4d781eda3dbbb8f5d57b101fd11d091d.jpg)
So I'm guessing one of the SIMMs is bad (I think there are four 1MB SIMMs installed on the accelerator), or there's another fault somewhere. I did replace all 13 surface-mount capacitors on the accelerator, so maybe one of the replacements isn't making a good connection or is bridged, but I doubt it. A couple of the old caps did look like they leaked a little bit, but nothing catastrophic or visible until after they were removed, and none of the nearby traces looked broken. Anyone have any idea where to start with troubleshooting this? I could start removing SIMMs, but I *think* that jumper block above the ROM chip may be for configuring the amount of installed RAM, and I can't find the manual for this thing anywhere.
![PXL_20220627_004907051.jpg PXL_20220627_004907051.jpg](https://tinkerdifferent.com/data/attachments/5/5994-f020ca2e6c072c66e11599f0d296fa10.jpg)
![PXL_20220627_004918331.jpg PXL_20220627_004918331.jpg](https://tinkerdifferent.com/data/attachments/5/5995-b43c8b4a0ebbc405596450883bc519ab.jpg)