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Thanks for looking that up for me. Unfortunately that pin checks out. Not that it's helped but I did find a broken trace to the Write Enable pin on one of the RAM chips, and another on another chip between an I/O pin and 74AC245. I'll have to keep hunting around

Ok so the wire wasn't actually between those two chips, I was mis-remembering but here's a pic. Green wire but look familiar? In the time I had with it while it was working after the recap I worked out it was from a university in Sydney Australia and looked like it hadn't been opened since it...

Gee they must be so delicate. Does it get better from the Powerbook 100? You know there is already a wire between those two chips so you must be spot on, it has clearly had issues there before and been repaired. I probably disturbed it or maybe another is broken. Will see.

So it looks like I'm SOL with this one for now... luckily I've got a garage full of computers to restore. I'm still pretty happy with my progress for a first try and will shelve it with notes until I learn more about electronics. Basically after the reflow and clean it runs flawlessly on power...

Awesome info. I'll have to get some heat on there, all the connections seem to check out

Hi Techknight, I have an almost perfect portable now! Thank you again for the advice. That was my first chip transplant and you can see it here booting from the FloppyEmu. Can I ask some more advice? I've noticed there are still issues with power. For example; 1) It runs well on battery but...

Thanks techknight, really appreciate that info. I'll check the voltages and harness, change out that chip and hopefully soon I can let you know how I go.

Hi I'm restoring a Portable and have recapped. Everything works perfectly now except as soon as the system tries to read a disk the whole system crashed.   A bit of research suggested the SWIM chip and some times the SWIM clock are to blame. I have a dead LC board with the same chip that I...