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Bolle

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  1. Again, why not read the original ROM chips in your ROM burner set to 27C400 and compare the contents to the ROM file you got from the internet? Still 99% certain your ROMs are not the problem here. There is a checksum test early in the boot process, if your ROMs were bad that test would fail and you would not make it to the flashing question mark.
  2. When you make it to the flashing question mark your ROM is fine. It would have failed the checksum test if it wasn’t. To verify you can read it with your programer and compare it to the ROM file you got from the internet.
  3. What type of PAL is this originally? Converting it to use a GAL or an ATF replacement would be useful I guess. Edit: nevermind, fusemap already is for a 16V8 type device. I'll give it a try later on.
  4. It's supposed to have 0 Ohms as it's a fuse and not a resistor. Violet - Black - Red edit: actually that's probably orange which would make more sense -> means it's a 7A fuse. If it's open or anything greater than 0 Ohms in resistance then it's going to be defective.
  5. It’s blown then. You’ll have to replace it.
  6. I actually ended up soldering most of the modules down on boards that would have needed new SIMM sockets anyways. 1.6mm really is too thick, you will get them into the sockets but once you take them out again the socket won’t reliably hold any standard SIMMs anymore with good contact.
  7. So far I have been using them in the SE/30, IIci and Q950 without any major problems. The only issue I have is with the thickness of the SIMMs. As with the ROM SIMMs 1.2mm seems to be slightly too thin and 1.6mm is pretty tough to get into some sockets. Just like with ROM SIMMs 1.4mm would probably be perfect here.
  8. There are supposed to be different versions and the one I have got came out of a IIvx where it was working just fine. That same card works just as well in my IIci and IIsi. Not sure what the actual difference between the different versions really is.
  9. Correct, you need some sort of adapter to run the PowerCache in the SE/30. There are adapters which were made by Daystar back in the day. You come across those on eBay from time to time. Another option would be the Artmix Twinspark - this will let you use the accelerator and another PDS card like a video or ethernet card. And to continue with the bad advertising... I am making adapters as well that already include an ethernet card and will let you use even another PDS card on top of that, so you can get ethernet, a video card and an accelerator all inside your SE/30.
  10. Feels like cheesy advertising but this might be relevant to your interest:
  11. I am on it, it’s just at the very end of the to-do list and other stuff seems to crop up ahead of it everytime something else actually gets done. This reminds me, I was going to look into modifying the II logicboard to accept standard RAM as well... I made up a mod in the sketchbook which would be completely reversible but didn’t actually try it yet.
  12. I made one that uses two 16M*4 chips. I used to source those chips from 128MB 72pin modules. One 72pin SIMM will give you enough chips to build 8 30pin SIMMs this way. If you go for parity 72pinners you will even get some spare 16M*1 chips which will usually fit onto the IIfx SIMM design that's floating around. 30pin2chip.zip
  13. Most if not all Apple logicboards of that era are at least 6 layers. SE was 4 layers, not sure about the Mac II but everything afterwards was min. 6 layers.
  14. I can get you a nicer one as well if you want Doom title screen in grayscale on the SE/30? Just let me know what you're looking for.
  15. I just experienced the exact same thing when testing my PowerCache and upcoming Turbo040 clones. Sometimes I would have to reset the machine before it would boot with a Turbo040 in place. With adapters, network card and accelerator in place the 5V line was sitting at 4.78V. That seemed to be enough for the PowerCaches to work reasonably well, but once they warmed up some of them started to get unstable. The Turbo040s would crash nearly instantly once the control panel loaded and the cache got activated. I turned the power supply up to give me a nice 5.05V under load
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