Fixed the NEC Versa 40EC power supply board, turns out I melted a wire between the secondary pack negative terminal on it's way to the circuitry. I replaced it with a thinner wire. The machine now charges and runs like normal. Just needs a new battery, and I located the company that made the battery for my P/75 & M/75 - they make a version for the Ultralite/E/V models as well, so I'll spend on that sometime down the road this year. That said, I think 2021 is going to be a bit ...
I've worked out enough of the pinout to get the laptop running with a third party power supply. I don't have a good battery, so I wasn't able to really determine what the battery sense terminals do, or see what things look like when charging. I can dig in a little later after I build a replacement battery; a project for another day. In the image you can see the pinout looking into the computer. These are the male pins. ...
So the P/75's trackball started getting erratic last night and I troubleshot the issues to relate to the laptops's loose plastic bits interfering with the operation of the VersaTrak. So I took out the loose bits, threw some tape on the inside, and viola....the computer is happy as a bug again. But this has me thinking, a lot of the problems with 90's laptops that I've had have been 2 types of issues - power, and structural issues. Something I've been interested in with regards to ...
So, while the M/75's case is crumbling like Feta Cheese to the point I can't use it anymore (that's why I said it "died") - at least not in it's current state.....I got a crazy idea......old computers don't come to the Creeping Network to die, thjey come to the Creeping Network to be reborn as something better than they could have been in their time. The #1 problem with all these vintage laptop computers is the darn cases. I've owned about 10 of them, and they would make ...
So my M/75, despite being the favorite, has finally crumbled beyond usability. NEC Versa are notorious for this. That said, I'm downsizing and focusing my improvements on the 40EC and P/75 from this point on. And the P/75 will become the main FreeDOS system, which oddly, is only crumbling on the bottom plastic, but the top chassis is solid as a rock somehow (save for parts of the palm-wrest). Plus it just does not need that much work to keep going....I might also look into cross-pollinating ...
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