Gregory's Serverpulled the main power transformer for reverse engineering purposes.
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92 comments
 it also explains the mystery "INPUT SIGNAL" pin on the old 4-pin IBM Thinkpad power connector. this pin simply increases the output current limit when it is pulled low by the laptop. it's because the power brick is also the battery charger, and when the laptop is turned on, you have to increase the current to compensate. @tubetime Please don't step on those! Lego is bad enough already  @tubetime Haha, that was actually my first thought when you started this thread. "Those are just dressed up card-edge connectors." Nice job.    @tubetime All this is making me miss my old Thinkpad 701 Butterfly. Damn that keyboard design was so neat. the operation won't start until the parallel port is ready--i had to pull the BUSY line low with a jumper, and now i instantly get this error! good luck figuring that one out  @tubetime Where's the code setting up the DMA channel so the parallel port doesn't read/send data from the weeds? :D @tubetime for a second there I forgot these use the aptly-nicknamed "ThinkPad 700 drive". What a cursed thing it was, DBA-ESDI 2.5". @tubetime My guess would be acquisitions and not caring about all the product lines of the acquired company. Good news is now that TE owns all connector manufacturers*, they won't have this excuse going forward. (*slight exaggeration)  I started archiving catalogs from connector companies just because of that problem.  |
last night i reverse engineered it. the design is simple so it wasn't too hard. the files are here: https://github.com/schlae/Thinkpad700CPower