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Got the board assembled enough for testing last night, Since V1.0 worked I was assuming this was going to be more of a formality than anything however (and much to my surprise....) I flipped the switch and got..... nothing. No chime, no video. About 4 hours of troubleshooting later (And a few...

It is a very nice finish, I'll probably go matte black / ENIG on the 1.2's :) I'll make a thread in the trades section once they have been tested :) Funnily I didn't even know a revision without them existed untill I saw your last livestream! Every LC I have ever seen or worked on has had the...

Keeping them under the relevant subforum makes sense to me, personally I think guides etc will be easier to find that way.

Annnd it begins again! V1.1 is being assembled: (The camera on my phone wasn't wanting to focus...) Hopefully this one should work with just the one jumper between /CE and /OE Still can't decide if the Matte black or purple boards look better.... :) (I did want to get some made with clear...

I would replace those two capacitors, I had a couple of 1x0 series powerbooks a few years back which acted a similar way and replacing those caps seemed to improve the symptoms

In theory it would be possible, however would take require a significant amount of modification to the board to fit it in as there isn't enough space to fit a second slot above the first (the SCSI lines comeing from the 85C30 get in the way) I would be more inclined to remove the RAM slots...

That doesn't surprise me, one of the things the clock chip on the LC III (and presumably the 475 is the same) dose is generate a 31.3344mhz clock for the serial, given this is the same speed as the oscillator it's safe to assume this is just being passed straight through the clock chip. I guess...

The little PLCC chip (U22) next to the crystal is a custom clock chip that multiplys the output of the crystal up the 50Mhz (which is then devided by 2 by the VLSI to get the 25MHZ CPU clock). The placement of the resistor signals to the clock chip and VLSI what speed the system should be...

Did a little bit more testing today, got the board to 7.1 from a scsi drive (after doing a little bit of shuffling around to get the correct system enabler on the HDD) :) I also tried swapping the main oscillator crystal from a more commonly available 32Mhz crystal (The original being...

Annnd, We have floppy(icon)! :) All the grief was caused by this: That was causing a short between RA1 and RA2. Annoyingly because of the way sprint works this dose not show up as a error when you run DRC..... Audio still dosen't sound correct and is very quiet so it looks like there is a...

A progress update: The board has now been populated enough for testing, and after finding and removing a short between /BERR and /HALT on the CPU the board now produces a slightly garbled chimes of death when powered on. This is good as if the board is working enough to produce a chime it must...

They do, I have one around here somewhere It'll probably be quite difficult to source one now, given they would have been pretty niche even back in the day and 2.5" scsi drives are all but extinct now It wouldn't be too difficult to reproduce though given it's just a straight through passive...

And V1.1 PCB's are here!

Boards are here, and in JLCPCB's new and rather fetching purple! Soldering the PLCC's and SOJ's: I did start trying to solder them by hand, but quickly remembered why I hate soldering PLCC's by hand and quickly went back to using a stencil and solder paste. It's just so much easier! And...

Should be all that's needed, I need to build one up to see if I made any other mistakes. I'm just annoyed as that was the fault that was stopping the V1.0's booting and I somehow forgot to fix it...

Awesome! I can finally get more than 8mb in my IIx. I should have everything needed in stock too, just have to add some of these PCB's to my next order with JLC :)

This is a ongoing project to create a 1:1 replica of the original Macintosh LC Logicboard This project is in a fairly advanced state now, The board has been drawn up and V1.0 boots with a few patches and one trace cut: This board has been fully tested and everything on it works, Not bad for a...

This is a ongoing project to create 1:1 replica's of the Macintosh LC III Logicboard Most of the hard work has hopefully been done on this one, a V1.0 PCB has been drawn up and sent off for manufacture: I'm currently awaiting the boards from china, should be here by mid next week More updates...