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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...