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Here's the wiring for the serial adapter. Note that the symbol for the 8-pin female mini din connector is not correct (didn't have it in KiCad, don't know how to edit). Pins 3+4 are the ones closer together, and pin 7 on the top row is on the same level as pins 6 and 8...

Here are two things I was playing with on my Mac 512Ke today :) First is a 3D-printed "battery replacement" for the early Macs. It uses three LR44 batteries in series (counting up to the 4,5v as the original) and mounts in place of the original battery. Much cheaper than buying one of...

Ok, an update on this. I didn't really felt like I was making any progress, so I turned to eBay. To my surprise there was a untested 630-0102 analog board (also 120V) for sale in german eBay. I thought why not, it was only 30 eur + shipping, I also got some needed spares from the same seller (a...

R21 should be a 100K EDIT: here's the link, took some time to find it :)  --> https://github.com/nickpunt/nubus-se30/tree/master/Schematics/apple The screenshot is from sheet 14-19, bottom center.

Still no dice  :sad: I have noticed one bigger issue. In the Dead Mac Scrolls (Troubleshooting, flup-flup- issues, page 24) there is a description that one should be able to measure a lowish 31/30 ohm resistance over the CR20 rectifier diode. And 52/53 ohm across CR21. If I try to measure that...

Hi @Will Cheyney, thanks for writing! Good to know that you got yours working afer the issue, that does give me hope! Those resistors R47, R49 were indeed bad in my board, too. My board already has had more damage (Q9, Q11) but hopefully I can still figure this out. I am not sure if I have yet...

I re-capped my PB100's charger just a while ago. I used a vice with small blocks of wood and indeed it worked nicely!

@max1zzz: yes, I had the logic board attached. @cheesestraws: ok, saw that just now. (Thanks to both of you). In the listings the only given non-OEM part number is Philips ECG5589, and that is a huge bolt-like (ST-75 package) 550A part (according to Philips datasheet). I think that must be...

Ok, I have now replaced the burnt resistors, and also Q9 (2N3906) and Q11 (2SC2810) which I found shorted. Now powering the machine up with a step-down transformer, I get a hiccuping sound (I guess this is the "flup flup flup" as described in The Dead Mac Scrolls). I quickly powered down...

Nice! I think that the Portable is not supposed to be run without the main battery, it might cause strange issues. If you look at my link (a write-up on Reddit) you can see that the PSU is glued and you need to crack it open. I used a vice and it worked reasonably easy and there was very little...

I just recently recapped my Portable. While testing it, I had some random audio issues, rarely loud, usually just faint noise/buzzing. A bit later I noticed that my charger was actually very sick (later on had no output at all) and needed recapping. Since that I don't think I've had those audio...

Hi! New here :) Was going to post this here first, but as my activation email didn't get thrue until today, I posted this already in Reddit /r/vintageMac. I came across a local ad for a Mac 512K keyboard and mouse. Reading the ad, I noticed that it actually noted "a non-working Mac 512K can...