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Afternoon @robin-fo - Since making my post I've measured the two tin can electrolytics and tantalums and they're as expected in both capacitance and resistance. There is a low resistance over one tantalum, but the low resistance was the surrounding circuit and not the capacitor when I removed...

I bought a NOS Zip Drive on Facebook Market Place - one of the old shape ones that is translucent and USB (to match the early iMacs). I was pretty excited because it was still sealed and so were the provided 3 disks and the manual / drivers. It arrived a short while ago, I opened it and plugged...

You're entirely correct, I've just got muddled at some point in the past. Thank you for making me look. It is a pain to look because I have the DOS card installed and the resistors are under there. A DOS Compatibility setup for anyone interested : This poor machine has had a rough life. It...

Hum, and just to collect info in one place. Here is a few more ramblings about upgradability : The Performa 630 family have quite a lot of expansion slots. As well as an IDE (great for Compact Flash disks) hard disk and SCSI CD ROM bay (not always fitted from factory) they also have... Built...

They're great little computers :) I really like them. They were super cheap when all other 040s had gone expensive, but will punch blow for blow with a Quadra 800 in most benchmarks, and have some cool upgrades available. Overclocked to 40MHz they out benchmark an 840av. These ones are easy to...

Yeah, I think the official names were "Lego Dacta Interface" for the one that works with the Apple II, Commodore Pet / 64 and BBC Micro, and then the one I'm using was called the "Lego Dacta Interface B". Sadly I don't have one of the originals, but they're basically a bidirectional parallel...

Last couple of days I've been messing with a 9751 Lego serial interface from about 1994 on my LC 475. Lots of fun. I don't have many official sensors to go with it, but I've made a couple of my own. Yesterday I got it working after working out that the TX and RX were backwards as if it was a...

For interest, a newer version of Gemstart, optimised for System 7.1, has surfaced. I've added it as download 16 here (Gemstart Universal 7.1) : https://macintoshgarden.org/apps/accelerator-card-drivers Originally uploaded by @David Cook to 68kmla, but 68kmla doesn't allow non-logged in /...

Using 16MB SIMMs in Bank A and nothing in Bank B is commonly reported to cause no-boot issues with the stock ROM. There is no reason not to put small SIMMs in Bank B, normally, and it improves compatibility. But you want to clean the contacts on those SIMMs. Given you're having more luck without...

BTW, if you use a hairdrier to warm them up, they are a little less brittle, but you still need to be super careful. You shouldn't need to ever touch it again after cleaning them and swapping them over. If you have some contact cleaner, spray it in the slots while you're at it. Deoxit is...

The rule is generally "put the big SIMMs in Bank A" on the SE/30, rather than it specifically talking about 16MB SIMMs. 16MB SIMMs weren't readily available when the SE/30 was released and due to a court case from the Mac II/IIx era, Apple only listed configurations they'd tested. Yeah, those...

Do I remember you saying you put the 64MB in Bank B? I'd start by putting the 16MB SIMMs in Bank A, which is what the Apple instructions say. This will especially help when you're using the stock ROM. While you have them out, clean the contacts on both sets of SIMMs using IPA (rubbing...

The issue everyone is talking about results in the computer not booting, if it is booting, I wouldn't be too worried, but, I'd use Mac Test Pro... http://download.macintoshgarden.org/apps/MacTest_Pro_October_1995.iso OK, but that contradicts what others have said. There are likely more...

Or one of these : https://www.ebay.com/itm/167168922377 https://www.ebay.com/itm/335386619545

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.