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I recently picked up an IIsi off the local classifieds as a project, knowing it (and the PSU) will need a recap. Someone had already done the 50mhz oscillator upgrade, so that was a plus - until I cleaned the board and started inspecting it. When I turned it over I saw corrosion around the...

I'm not using a killy clip any more, I have pin headers soldered to the 68000, and the socket on the accelerator slips over those pins. I checked continuity between the pin headers and the base of the 68000 legs and it seems like all the pin header solder joints are good. I used deoxit to clean...

I haven't recapped it, it may have been recapped 30 years ago, but definitely not recently.

I adjusted the voltage and unfortunately there was no change. I went up to 12.1v & 5.03v without the accelerator, with the accelerator it dropped down to 11.95v & 4.82v. I also turned it up a bit more until I had 5.0v and 12.2v, no change. The voltage was pretty steady, fluctuating about...

Thanks Bolle, I checked the voltages at the floppy port with the internal floppy disconnected, they are a bit low: Without accelerator: 4.76, 11.66 With accelerator: 4.72, 11.61 I'll try adjusting the voltage today after work and report back.

No I haven't done any disk-specific benchmarks. The "stock" SE in the comparison was the accelerated SE with the accelerator disabled, I might try running the same benchmark on one of my non-accelerated SEs and see if I get the same low results. Maybe the low disk score had to do with the...

I thought someone here might be interested in some benchmark results from my accelerated SE. The machine has a Radius 25mhz 68020 accelerator with 68881 FPU. 4mb RAM, spinning-platter HD. The SE/30 used in the tests has 8mb RAM, Mac SD drive, and a Radius 40mhz 68030 accelerator. Both...

No updates yet, it's been moved to the back burner for the moment. I really need to get my hands on a working IDE MiniScribe 8425 or equivalent, I know a guy who may have something but I probably can't get to his place for a month or two. Those drives on eBay are close to $100 and sold as-is...

Great thanks for the info, please do update as you work on the drive! I actually just got a Miniscribe 8425 working yesterday, unrelated to the one I talk about further up, this is a SCSI version out of an SE. It was having trouble seeking and wouldn't boot, the stepper motor would just go...

Somewhat related, can a 1.44mb drive be used in place of an 800k drive and still read/write 800k disks? I have a spare 1.44mb drive I'm going to clean up and see if it works, and I have a Plus with an 800k drive that isn't working properly. I thought I had read that you could swap the 1.44mb...

Wow thank you for posting this, I have been looking for this info for years. Back in the early 90s I was at a Boeing Surplus auction and saw a whole pallet of these machines, yet no one on the forums had ever heard of them. I was starting to question my sanity. If anyone knows of one of these...

Great thanks, I spent longer than I'd like to admit looking for a component labeled U1F. 😅

Thanks Kai, I'll reflow the P1 connector pins and look at U3 when I get a chance, hopefully this weekend. I'm not clear on the part about checking U1F, U2F, and U2G. My technical knowledge of these machines is somewhat surface-level. I didn't see parts U1F, U2F, or U2G on the Plus AB, but...

I tried a known-good analog board with the same results - no change. I also don't know when/if this AB has ever been recapped, but the fact the behavior was the same makes me think it's not the AB. I was able to confirm the buzzing is coming from the speaker and not the caps.

I hadn't thought about the AB, if it has been recapped it was 25+ years ago. I have a couple other working machines I can swap boards with.

I haven't taken a really close look at the board with a magnifier or microscope yet, I did take a quick look and didn't see anything damaged, but I can look closer tomorrow. The two garbage screens are from different attempts to power up. Neither is related to any specific set of conditions. I...

I have a Plus with a Total Systems '030 accelerator that's giving me some problems, I'm hoping someone here might be able to help. I've had the board for years, it sat for a very long time without being used, and a couple years ago when I tried to remove it from the machine, the plastic Killy...

Ah ok, thanks for the info. For a moment I thought maybe I could swap the SWIM chip from one of my junk SE/30 boards, but Google quickly dashed those hopes. 🙄

Somewhat related question... Do you know what is required to switch a SE to support a 1.44 floppy? Obviously you need the 1.44 drive, can you just swap in the FDHD ROMs, or is there more to it?

Very cool, I had no idea you could (barely) fit an internal HD along with the dual floppies! I wonder if that was a commercial product, or something someone built themselves. Does the bracket have any markings?