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I read somewhere that you can take the 8 chips off a 1mb RAM SIMM and use those to replace the onboard 1mb. Is this correct? I have some known-good 8-chip 1mb 80ns SIMMs, and this seems like the easiest way for me to get known-good chips to replace the onboard RAM.

For reference, here are Speedometer 4.02 results from my SE/30. with a 40mhz PowerCache and a 50mhz PowerCache. The machine has 8mb RAM, I think these results were under Sys 7.5.5. 50mhz is on the left, 40mhz on the right. Both cards had the control panel installed, with both PowerCache and...

I'm doing some troubleshooting on my IIsi board. I put it under the microscope this morning and took a bunch of photos so I can sit down later and take a very close look for broken traces, however as I was taking the photos all the traces looked in excellent condition, even the ones around the...

I just finished recapping my IIsi logic board and PSU yesterday and it was working great. I had powered it up and down at least 10 times, it worked great each time. This morning I had it powered on and a circuit breaker in our apartment tripped. This particular breaker tends to trip...

I had a guy solder this male-to-male adapter onto my Plus CPU to mount an accelerator, unfortunately that accelerator seems to have died. It should work pretty well, but still not a simple install since you need to solder to each leg of the CPU, but it does allow the accelerator to be easily...

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...