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The two extra wires pick up the two additional RAS signals form the bottom of the board, it's essentially just a custom quad rank SIMM I hadn't thought of adding a header to the reloaded designs, I'll defiantly be doing that now :)

It works! Just have to hope that simm will still fit in the case :)

I'll send you a message once I get around to weighing the boards so I can get postge prices, I have three of the V1.1's avalible for the cost of the PCB + shipping or the final PCB's will be available in a next couple of months

Shipping to Germany is no problem, I'll get a postage price and shoot you a PM sometime tomorrow

Absolutley! it's still a very active project just I haven't had time to update it recently (too many other projects....) The V1.1 boards have been tested and mostly work fine, they require two small patches but that's it, V1.2 boards with these errors corrected will be drawn soon Though if you...

There are a few pictures in this thread: https://68kmla.org/bb/index.php?threads/reverse-engineering-the-macintosh-plus-pcb.38414/ I'll post some more up to date pictures of the ROM-inated board once I have actually tested it..... Need to go pull the 512K out the loft so I can test it (Oh, and...

I have repro plus boards, includeing one with a Rominator built in (Which I got PCB's for in January and still need to test!) Really need to get around to posting those designs on github.....

Maybe I'm going mad, but the DS1307 has a completely different pinout to the apple RTC from what I can see.... The 512K and Plus seem to use pats with the same pinout: But the DS1307 is differen't: I stand corrected on the hole "should work in the II series" thing though, the 128k / 512k do...

I was under the impression that the 68000 compacts and mac II family used the same RTC hence my "should work" statement but it is entirely possible I am wrong there! Still waiting for the chips so Ic an do some experimentation

Oh sweet, I thought that was a custom chip! Ordered a few for testing :) Off the top of my head I belive that chip is used in the 128k -> SE/30, as well as the II, IIx and IIcx (as well as the classic however that has the chip in a different package)

The extra pins are for extra address signals to allow for larger ROM's to be used, this was presumably because apple had plans to release upgraded ROM's at some point but never did

Time for a little update: The logicboard has been stripped and scanned and I am currently working on tracing the outer layers This is only going to be a aide for generating a schematic though, the board is a 6 layer one so simply tracing it in sprint isn't going to be possible (And even if it...

Unfortunately that one is a no-go, looks like the design is not a universal as I was hoping it would be (Causes some eintertaining chimes of death when installed in a IIcx). Still have a couple of in the works variants of that card though (pending compatibility and if I can find a nice way in...

16 on each side :) (It just looks like there is nothing on the other side as the chips are sitting exactly on top or each other)

And while where here, here is a custom quad rank SIMM for the LCIII: 32 RAM IC's was quite a lot to squeeze ona 72pin simm! :) Just have to hope it's not going to be too tall to fit in the case now!

Yes probably, I only say "banks" as that is what is logical to me even though it is probably technically incorrect . From here on in we shall refer to them as "Ranks" :) Don't know why I keep not answering that - no I don't. I'm purley working on what About this Mac reports, I think the...

Ok, let me start over because I think we are getting crossed here The LCIII supports 5 "Banks" (Banks may not be the correct technical term but it is what makes sense to me) Each Bank has one unique RAS line Bank 0 is the onboard soldered RAM Banks 1 and 2 are the 72pin simm socket Banks 3...

Gotta love it when a new board design works on the first try :)

Just tested it, unfortunately the LC is still reporting only 4MB of ram with 16 installed

Great, many thanks! I'll test it after work tomorrow and report back