David Cook's latest activity
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David Cook replied to the thread BlueSCSI on Macintosh Portable.The Macintosh OS was novel in that it allowed files to consist of two "channels". The first channel is called the "data fork" and is... -
David Cook replied to the thread Portable Misc - Hinge clip fix, Earlier features, Super Static memory.When I asked if you had a primary source, I didn't expect you'd whip out Jean-Louis Gassée. :ROFLMAO:
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David Cook replied to the thread Portable Misc - Hinge clip fix, Earlier features, Super Static memory.I use this: https://amzn.to/4vcD03m It seems genuinely strong. I know the true test is whether the part breaks at the bond site or on...
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David Cook replied to the thread Macintosh LC III Bodge-Laden PCB.Nice job. C22 is reversed. That is, although you installed it in the way Apple marked it, Apple made a mistake. You need to flip it the...
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David Cook posted the thread Portable Misc - Hinge clip fix, Earlier features, Super Static memory in Macintosh Portable.Broken Corners I've seen enough broken cases that I lean toward being pragmatic rather than attempting a pristine repair. A common...
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David Cook replied to the thread Macintosh LC III Bodge-Laden PCB.Correct. Those are factory.
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David Cook replied to the thread I broke and fixed Macintosh Portable (backlight). Attached backlight circuit schematic that I reverse engineered.Looking at the Portable driver code, I believe O1 of U13G is also connected to display J19. It appears this is the backlight enable pin.
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David Cook replied to the thread I broke and fixed Macintosh Portable (backlight). Attached backlight circuit schematic that I reverse engineered.Here are the IDs (see U13H): Backlit portable: $A5 10100101 Upgraded original portable: $A3 10100011 PowerBook 100: $AD 10101101
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David Cook replied to the thread I broke and fixed Macintosh Portable (backlight). Attached backlight circuit schematic that I reverse engineered.They're outputs, so they could just be floating. Thanks for letting me know. If I get a chance, I'll also take a look. It wouldn't...
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David Cook replied to the thread I broke and fixed Macintosh Portable (backlight). Attached backlight circuit schematic that I reverse engineered.I had no idea that the "backlight id" and "backlight brightness register" were implemented in such a rudimentary manner. There are 5...
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David Cook replied to the thread I broke and fixed Macintosh Portable (backlight). Attached backlight circuit schematic that I reverse engineered.Incredible write up! It explains so much. Based on your schematic, the digital potentiometer chip (U14G) is actually being used as a...
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David Cook replied to the thread Portable CCFL Backlight Replacement with Off-the-shelf LED Strip Driver.Not certain. But, I agree with you that noise can be a showstopper. For example, all of my recent PCs have beQuiet cases and fans.
