Portable keyboard Matrix?

[ScutBoy]

Does anyone know the layout of the Portable keyboard matrix?

I've got a Portable that crashes when you press certain keys, like U, D, L, arrow keys, etc. It's not they keyboard itself, since if I switch in another keyboard, it does the same thing.

As I'm going to start tracing things through the keyboard controller, VIA, and PowerManager, it might be helpful to know a good vs. bad key as I'm checking things out.

 

[Elemenoh]

I had a similar issue post recap. esc, 4, 5, 6 and + would short the reset line when pressed. It turns out I shorted a trace right next to C24+ which was the issue. Maybe you did something similar near C15 or C26? I'd check that area first or by C116/C14 if you have the keyboard on the right side. I had to remove C24, add some solder mask to the neighbor trace and then reinstall C24 in my case. Works great now.

 

[ScutBoy]

Thanks for your note. The thing frustrated me so much I put it back on the shelf. This might get me to pull it out after VCFMW!

 

[Trash80toG4]

I worked it out in a thread over at the MLA, I'll look around for it.

edit: that was a quick search!

Mac Portable Peripherals - Schematic Development

Thanks to a post by @techknight somewhere I had the connector pinout from the Schematics to begin with. Up front, started late last night. Working from the solder side of the KBD, trying to match the pinout to the connections GND seemed wonky, the MODIFIER connections weren't making sense...

68kmla.org

 

[ScutBoy]

I worked it out in a thread over at the MLA, I'll look around for it.

edit: that was a quick search!

Mac Portable Peripherals - Schematic Development

Thanks to a post by @techknight somewhere I had the connector pinout from the Schematics to begin with. Up front, started late last night. Working from the solder side of the KBD, trying to match the pinout to the connections GND seemed wonky, the MODIFIER connections weren't making sense...

68kmla.org

View attachment 8480

Sweet - thanks!