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Does someone still make something like a Killy Clip that would connect the accelerator to the Plus CPU?

The CPU is the square chip in the center, if you zoom in it says 68000. That's the same one I'm looking at on eBay, I requested the additional photos from the seller.

I'm looking at this old 16mhz 68000 accelerator for an SE, and I can't quite figure out what's going on with the PDS connector. I know this style of male PDS connector with just exposed pins and no plastic surround wasn't uncommon, @JDW said he has a board with a similar connector. What I...

I like how you're thinking...

I have a 512k with a 20mb HyperDrive I picked up a few months back, the HyperDrive was non-functional when I bought it. The drive itself did not work, a component on the controller board (the board on the drive, not the HyperDrive daughterboard) had melted and damaged the board. I just picked...

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.