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Seems like there will be a few of these up on eBay! L@@K! Rare 512k Mac Classic Prototype! Steve Jobs! !!RARE!! I know what I have!

I was actually a bit surprised at my measurement results. I run a number of Seasonic SSP-xxx-SUB PSUs (xxx - 250 or 300 W) after first finding them as a suitable replacement for SE/30s. In the SE/30 use-case I had typically measured very close to 5V but I may go back here again and check what...

I'm not sure what the difference is to the chip you found (it might just be the package quantity that mouser can order from the TI Datasheet (i.e. difference between D and DR part number). But the part I ordered (still available) is below. Good luck!

I will confirm the part number but before you replace did you check continuity from UH6 to everywhere it’s supposed to go? Schematics are available and I think a broken trace is probably most likely.

Actually not the exact same issue as I didn’t get a sad Mac, just a classic that wouldn’t show more than 512k of ram.

I had this exact same issue and posted my fix in this thread. https://68kmla.org/bb/index.php?threads/macintosh-classic-ram-problem.30001/#post-335979

This is awesome! I don’t think SCSI Ethernet can touch the speed of a card based solution and SCSI Ethernet remains a bit more flaky (although that’s in comparison to the reliable drivers for presently available Ethernet cards- this project is a bit nascent to conclude there). I would be...

Looks to be an E42K (65 um) if I understand how the coding works. See pic below. There is pretty good airflow - I'll snap a picture once the thermal glue has cured and it's back in my IIci with the heat sink but the CPU is pretty close to the air intake grills at the back off the PSU. I had...

Well I am going to have to walk back what now looks like an outlandish claim regarding the temperatures my 68040 reached! I had recently rebuilt my Arduino based temperature sensor and, after the comments here, went back and realized I had connected my 5v into the Vin, instead of the 5v pin...

Before I would have said fairly accurate as I had previously calibrated with ice water and boiling water, but I checked again last night and was getting inconsistent results with boiling water - I need to confirm why the calibration hasn't held and then I'll remeasure and update as required but...

I recently added a Bolle Carrera040 to my IIci, using a 40mhz 68040 I bought from what I understand to be a reputable supplier on eBay. Everything worked fine but I was surprised at how hot the processor was to the touch. I ended up affixing a thermistor to the bottom of the processor, using...

This! I just fixed an SE30 this weekend by replacing UE8 and UF8 and bodging a bad connection on pin 1 of UE8 (which I think was the actual issue). My SE30 had a clean looking motherboard which I recapped and while it worked I would get random crashes and address errors. After a while it...

A IIe platinum is my daily driver IIe. All decked out with 8mb of RAM and all slots filled. I can turn it on and it’s ready to load into proterm for bbsing before the CRT has warmed up.

This is awesome!

I discharge the CRT whenever replacing analog boards etc but not once have I ever heard a discharge. I understand it’s just a fail safe in case the bleeder resistor fails (or you’re working on a really old ab without one) Also I have a capacitor discharger and I’ve never a residual charge on...

I haven’t ever really heard the sound from the seasonic psu fan over the se30 fan but with the Astec psu case I’m thinking you’d be fine given that it’s pretty well ventilated and the se30 is a pretty low load. I’m also quite sure somebody did exactly this once in this thread.

I’d be interested. I have a card without the breakout board.

Agreed on all of @cheesestraws comments regarding the CC. I have recapped two CC analog board and its cousin the LC575. I recall somewhere near 50 caps plus a couple of diodes known to overheat. They are still tempermental. One great piece of advice from someone here is to watch the grounding...

If you get an Ethernet card I’m pretty sure (virtually certain) you can sync with that as well.

It would be interesting to run speedometer on this. I had a Transwarp 2325 in my classic back in the day which also did not have RAM on board limiting the speed up. It was definitely faster than stock but even at 25mhz it was no where near an SE30.