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Is this any use? https://www.ebay.com/itm/364712598461 Not sure if the peltier cooler would be in the way.

Put 65MB in it, the SE/30 can be a little weird and doesn't always boot if you put 16MB SIMMs in one bank, and nothing in the other. It should work, but... it doesn't. I believe you should put the 64MB in bank A, and the 1MB SIMMs in Bank B, so I guess option 3? Apparently there are fewer...

Hum. I'd start by verifying voltages (under load), even with a easy recap, sometimes it results in voltage changes. Did you use low ESR caps for the output side of the PSUs to ensure stable voltages? Might be worth uploading some (high resolution, well lit) photos in case anyone happens to spot...

Yeah, that looks pretty CPU bound doesn't it. There there really is never a pure benchmark for a single parameter, especially on older machines. Norton's System Info manual with old versions gives a breakdown of what characteristics dominate each of their individual tests in a fairly open way...

Oh, completely, yes. If you think about it - for starters, the RAM is on a 16bit bus in the SE, while it is 32bit in the SE/30, but then, even with the accelerator, the RAM is only 8MHz instead of 16MHz, so right up, before you consider memory wait states, the RAM is 4x slower in terms of MB/s...

https://68kmla.org/bb/index.php?threads/gemstart-drivers-various-versions.44624/ I put a load of versions there. Also find 2.2 attached.

2.1 will work. But if you really want 2.2 I have it on floppy disk somewhere, and I think I've uploaded it somewhere... I'll have a quick look (then I should get some sleep - I've spent the last couple of days migrating my website to a new host and am sick of DNS, WordPress and email server stuff).

Ah no, that isn't the problem :) I checked the gerber files from github and there is another trace on the other side of the board. That was the information I was trying to get. So, back to it being a puzzle why it doesn't get faster with faster clocks. Sorry folks :)

We all make mistakes, even on github :ROFLMAO: - look at the trace you're breaking - it leaves the output pin of the clock and heads towards the FPU. Combine that with the fact that the weird behavior you're seeing would be exactly explained by this - the speed doesn't change when you add a...

I think they both work in System 6 :) You get to watch the silly startup animation. But the main issue here is that you never actually clock the FPU faster. Stick a frequency meter on the FPU clock pin if you can - you'll find it is always just under 16MHz. Not sure why your graphics were...

@JDW You misunderstand me - I'm saying those instructions are incorrect, or there is an error in the PCB design. By following those instructions you DISCONNECT the socket from the FPU. But... I don't just mean put it back, because then you would have two clocks at once. I was asking about...

@JDW... Just a thought... but I've worked out part of what is going on. You removed the blob of solder? So if you break the connection between pin 8 (Output) on the clock, and the FPU itself... how is the FPU clock meant to see the signal from your 33MHz clock? I think there has been a...

More than that, it would require a redesign of the card - this is a fairly simple card and its timings aren't disconnected from the SE's primary bus speed. I think it uses the motherboard 15.67MHz clock signal. The 68882 runs completely asynchronously and happily works with whatever clock you...

The FPU runs asynchronously though? Plus the many clock cycles it takes to do floating point, even with an FPU, means that memory shouldn't be a limit within reason. Also, this behavior doesn't match my experience with basically the same card, so it is either a clone issue, or a setup issue I...

I didn't see this in my first read through. This doesn't match my experience with my version of the card. For Norton's quickdraw benchmarks, the accelerated SE scored... 62% faster than a stock SE. Again, I'd suggest installing GemStart and re-running benchmarks. Edit - Here is a summary of...

Further to my previous post, I had a look in my phone for photos of old benchmarks I've run. In the following "Upgraded Macintosh SE" is an SE with the Total Systems Mercury fitted - as mentioned, this is electrically identical to the card your card is a clone of. Different brands, same card. I...

There is something strange going on here certainly. Normally, in part because of the asynchronous operation, FPU performance scales fairly linearly with clock speed. So, these cards are electrically identical to the Total Systems Mercury - I have one, but not set up. I could compare your...

Thought I'd make it more retro computer specific. Here's one for the vintage mac crowd : Edit : After modifying the software a little so I could change the sample rate and x axis resolution, I ran the light and temperature sensor for a bit over an hour over sunset. The temperature probe was...

I've seen similar ones, but I don't think I've used one like that. What an absolutely weird way of setting the voltage! Nice to have low voltage AC.

I'm trying to remember what we had. I couldn't find a picture. The physics labs had... like, boxes with a recessed face and a big dial in the middle, like a 2" knob with a 3" flange (giggles). Same banana jacks. In the tech department they had much newer stuff and they had variable DC power...