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It's an interesting and proven technology. I have no understanding of physics or air flow, but I do know a well-built chimney can make a fire roar. No reason a well-built chimney on a Mac wouldn't draw well, sending hot(ter) air to the ceiling. If I could find a drawing, I'd give it a try. I...

Ah ha! It is a pleasure and a delight to be on a forum with folks who are knowledgeable and helpful. I used to ride motorcycles. Doctor told me to stop. I found one forum, specific to my bike at the time, that would do what you two just did. Folks would answer the question. No one asked "Why in...

I feel fairly certain that my Plus is out of warranty... I scoped out the analog PCB and resoldered a number of connections. Shiny solder looks so much better! The capacitors all look to be in good condition. No leaking, cracking, swelling or ____. Now: what's the simplest way to get 12v+ to run...

Muchos gracias. As I suspected. Gld for confirmation. This is a whole new world to me. My previouss olde Mac is a 900 mHz iBook.

Greetings I've been enjoying my new to me Plus. Recently took off the case to see what's what. Installed a SCSI device. Testing, I found that the switch wouldn't always boot the machine. By pressing on the side, forward from the power switch, the machine would boot. If I released pressure...

Ah yes! Let's see wheat we can do to foul up the writers! Usually it's editors writers curse. Now it's the PCB layout designers!

Hmm. Not sure what source you're quoting, but I know my Plus' motherboard was minted with the date "1985."

As the title says, there were three motherboard derivations, beginning in 1985, ending in 1987. Does anyone know if changes were made with each permutation? Curious...

I hope you have lots of spare time! I just acquired a Plus from a member here. I'm always looking for ways to tweak my various computers. Adding RAM? Moving ROM into RAM? Sounds good to me. IF you go this route, I hope you'll keep us in the loop.