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jammi

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  1. They're steeply angled and seem to have much wider spacing than the original dual SIMM sockets.
  2. Thanks, that looks awesome! I've found things with heavy ground planes such as the SIMM slots on SE/30 are easier to desolder with a SMD rework station's hot air blower than desoldering gun. I've used the desoldering gun on the through-holes after I've picked the socket off to clear the holes from old solder.
  3. But what i'd really want is some redesigned full motherboard replacement good old chips from corroded boards could go into and have some modernization for these memory modules (or just soldered-on maximum capacity RAM). Saved space would provide enough space for integrated upgrades, such as maybe some integrated CPU accelerator and graphics card too (let's say sacrificing external floppy port for a video out connector). Lots of reverse-engineering though, and would more or less require some SE/30 core logic thing. At that stage, also adding soft-power would be pretty cool too, if replacing the
  4. I guess one thing such a module could do would be battery-backed RAM for read-write RAM disks and such, and could incorporate the ROM-SIMM functionality too, since they're on the same address and data paths afaik.
  5. Since 72 pin SIMMs are more affordable in higher capacities and they're electrically compatible with the 30 pin SIMMs. Each group of four 30 pin SIMMs map to a single 72 pin one. So how about some board-to-board adapter with two angled 72pin SIMMs to replace the eight 30 pin ones? Or even better, some modern-ish soldered on 128MB memory module that solders into the holes left by the 30 pin SIMMs?
  6. One option could be manufacturing adapter boards that mate with the SE/30 (or other model) motherboard via solder tabs, also some later era LC/Quadra/Centris models with the ROM socket solder holes unpopulated and either have the ROM board directly on that, or have that board have a new ROM SIMM slots. The slot, socket, port and other connector manufacturers even when initially out of stock, will re-run batches on demand, if the batch order count is high enough. In some cases "just" 1000 pieces, which could be doable in some group funding thing.
  7. It could also operate from a small battery and go into some sleep mode whenever it's out of termination power and could have some "ready" led when it's booted and running. Therefore, it'd sense the termpwr as a wakeup signal and be ready in a fraction of a second while the Mac is still doing its POST. The battery could also balance the power consumption so it can rely on something that termpwr on average can provide.
  8. I figured this one out. Right next to one of the caps with intact pads there was slight solder overlap with the traces next to it, so the solder joint was interfering with signals going to the floppy drive and sound chip. I removed the offending cap; its offending leg was off by a mm or so, therefore over the traces, straightened it up and removed excess solder from other caps too and now it works like a champ.
  9. I also guess termination power isn't enough to power a raspi even in some underclocked low power mode? Because if it was enough, you could just power it like that without any extra USB thingies. I'd also vote for a USB-C connector if you go the USB route, since those will be more plentiful soon. Micro-USB will be the rare thing you never find a working cable for just like the Mini-USB is now.
  10. So, I was using my Quadra 610 as usual since it's a pretty quiet slab with builtin Ethernet and has 68MB of RAM allowing it to run most of the stuff I've been throwing at it. Then it started freezing randomly and eventually no longer powered on, just having chimes of death. I tried reseating the RAM, removing and replacing RAM, VRAM and let it sit unpowered until cool etc, but the issue still persists. The capacitors don't look like they've leaked yet, so I've not done a recap on this machine yet, but will try once I have the machines that have already leaked their caps recapped first.
  11. So, couldn't you just use the 5V pin on the GPIO header of the Raspi to power it? That's what I do with most of my Raspis.
  12. Thanks, I did some assumptions, so I stand corrected. Anyhow, I assume nothing comes out of it until it's sensed the monitor plugged in, and if it really is reliant of drivers / some utility, I'm pretty much screwed since they're nowhere to be found. So far I had my run of checking Macs that probably had their batteries still in them, took a couple of photos of that and next day started thinking of it. I have some SE/30s to repair right now though (leaked capacitor damage), but I'll test what the scope says once I have them working. Is it possible the PALs could've been used as ROM rep
  13. From the description, there's something on the monitor interface itself that'll trigger it into operational mode when the right monitor is connected, and goes dormant when nothing is connected. This makes it much more difficult to figure out what the signals on the DB9 do. However, the logic of the graphics card seems to be composed entirely of 74 series logic, so it should be fairly easy to reverse engineer. I should probably also remove the ROM chip and make a backup of it. If I manage to get this thing working and clone it, it'll be a pretty neat little expansion for SE owners to use an ext
  14. It probably has no drivers, so getting System 6 or earlier should probably make it work by default. The next thing is figuring out how to make it output an image in case it's not doing it automatically when the System version is right.
  15. Anyhow, the problem still persists. I'd greatly value some information of capacitor traces since I think that's the most likely source of issue. If someone manages to remove caps without damaging the pads and taking a photo of that, it'd be perfect.
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