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My experience with the pizza box LC PSUs is that they need some load to regulate power properly. Without it you tend to get screwy values. Might not be all but some that have crossed my path on the occasion behaved funny if powered on without load but if connected to the board were rock solid...

My Takky modded CC went through several iterations over the many years I've had it: Mystic, 630 DOS Compatible Board, and now a 6500/250 board with a Sonnet L2 G3 500 card (bought it when Sonnet still sold them). It will/should run without separate 3.3v regulator if you don't use a G3 upgrade...

Hi Elemenoh! Not sure what dark crevasses of the internet you were able to pull the data sheet out from, but that was exactly what I was looking for. Spent a fair amount of time that evening looking for that specific piece of information but could not find anything, so clearly you're way...

Hi There, Currently working on restoring a Macintosh II system and would need some help with identification of some RIFA caps that are on the PSU. There are three 0.1 uF caps that are of the type that like to burn up. These have not cracked yet thankfully but I don't really want to push my...

It's been a minute to so figured I should provide a status update. If interested, see the details below, otherwise TL;DR: Got it fully working and project completed. --- After going over all traces between the RAM connector, CPU, CPU Glue, and MISC Glue several times (ROM and PDS for good...

Friend of mine let me use the SWIM and sound chips from one of his currently dead IIci boards so I can try to get the portable going again (I'll still be looking for another SWIM and set of Sony chips so we can fix his board next). Soldered on the new SWIM, crossed my fingers and fired up the...

Hi SuperSVGA, had a chance this evening to work on the board some more. I did end up tracing the address lines between CPU and MISC GLU. Those turned out be OK but I do want to give you a shout out because you were absolutely spot on with your suggestion that there may be issues with the chip...

Thank you very much for your response SuperSVGA! I did not think of that, I was focusing on just the lines from the CPU/RAM chips so hadn't looked at the MISC GLU/chip select. I should have some time tonight to check the area you called out. Good to know that all the critical parts seem to be...

First post here on Tinkerdifferent! So the Macintosh Portable had been one of my long term goal “bucket list” items and a few months ago I was finally able to grab a rather inexpensively priced machine. The system itself was in great cosmetic condition but sold as non-working, which of course...