Reverse engineering the LC II Logicboard

[max1zzz]

With the (hopefully) final revision of the LC 1 board and the second revision of the LC III both with JLCPCB for manufacture it;s time to turn my attention to the LCII. This was initially going to be the second board LC board I worked on before that pesky LCIII board distracted me...

The boards I am working form where kindly donated to me by cheesestraws from 68kmla for reverse engineering, Many thanks for that!

I haven't taken pictures of most of the process because it's more or less the same process as the previous two boards but here's when I'm at currently:

About 2/3 of the top copper is done, should only be a day or two more till this side is finished Then it's on to the bottom side which is always fun due to the huge amount of birdseed that's always on the bottom side.....

I'll post more updates as I work on the design

 

[max1zzz]

Top and bottom copper are done!

Next is the inner planes which are always fun.... might have to get the sander out for that

 

[FortyTwo]

Wow, looks like you are making great progress! As an LC II owner, I am looking forward to seeing the final result. It's a shame that there is no good, non-destructive method to see the inner layers.

 

[max1zzz]

PCB's are finally here!

 

[Kai Robinson]

Black with Gold ENIG always look so damn classy....

 

[rikerjoe]

Beautiful board!

 

[max1zzz]

I finally managed to get a board assembled enough to test:

I didn't really expect it to work, after all V1.0 boards rarely work out of the box however I flicked the switch and was extremely surprised to hear a clear chime! But I was getting a solid white screen.... The I realised I hadn't installed a VRAM simm, quickly installing one presented me with this:

It works!
I can't quite believe it boots with no modifications! (well, at least it boots this far, I still need to solder the rest of the connectors and fully test it so there is plenty of room left for things to not work)

 

[max1zzz]

The board has now been fully tested, everything on it works with no issues!
Now that's how I like my V1.0 boards

 

[max1zzz]

Board layout, gerbers and scans are now on GitHub:

GitHub - max234252/MacLCII_Reloaded: 1:1 Reproduction of the Macintosh LC II PCB

1:1 Reproduction of the Macintosh LC II PCB. Contribute to max234252/MacLCII_Reloaded development by creating an account on GitHub.

github.com

As with my other designs these are provided under a non-commercial licence but if you are a repairer and want to offer transplant services (or have any other commercial use in mind) please contact me