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Thanks, that's great to have it confirmed. Regarding SYS_PWR, the dev notes say: "This signal controls whether the CPU is in the active or sleep state.". So I guess it should be low at all time. It actually seems it's not always flaky and sometimes it stays low as prescribed. But look at this...

Thanks a lot for all your answers, that's very encouraging to have some support here ☺️ Now, to your questions: No, no HDD, no floppy, no trackpad and I've also tried with no screen. The board is cleaned thoroughly (IPA + water + IPA) after removing the old caps, no cap goo is present...

If I may ask, is there something specific that made you choose Formac instead of Micron?

https://vintageapple.org/gamba2/micron_ebay/736/2049940736.html I thought about this guy - which is the external-only color 640x480 Xceed and uses only GALs and no ASICs. I remember @Bolle also mentioned this at some point in the past (many months ago).

@Bolle Wow, this is amazing! I actually thought about doing something similar based on the Micron Xceed card I found in one of my SE/30s. The equations from Micron are (I think) public so it seemed like a relative doable quest. Out of curiosity, why did you decide for the Formac card? One of my...

Hello again, I'm coming back with a small (but not so positive) update on the project. I started by removing the suspect logic chips (listed above) and tracing main connections between VIA, ASC, SWIM, SCC, CPU_GLU, AC244s and the RAM/ROM/PDS connectors. The PCB is really in a very good...

Super cool, glad to see someone picked up on this, let us know how it goes! :)

@GregorHouse Sorry for digging this out, I have a very similar problem with a backlit Portable - have you found out anything more about this machine? Thanks!

Hello, I've managed to return a tiny bit to my 68k Mac hobby and decided to try to clean up an unmolested backlit Portable I had lying in the closet. What I've done: Didn't try to turn it on, just disassembled it. Desoldered all capacitors. Most of the cap juice seemed fresh and still mostly...

@cannfoddr which ICs did you end up replacing in the end? or just a recap was enough?

If you look at my screenshot from MacBench, you can see the results for two frequencies (@16M and @40M; the CPU was always at the default 16M). 40M gives a slight boost to the benchmark score. The card itself has a jumper to configure which clock to use (OSC means the oscillator on the card, SYS...

You can see a difference in Floating Point performance between the system clock (16 MHz) and an external clock (40 MHz) in one of my screens. It's rather little. Probably using a 33 MHz version would be very very close to 40 MHz.

@Arisotura I was wondering, what technique do you use to remove the sockets safely? A desoldering station? Solder wick? I also have a battery victim (a compact mac though), but I'm not sure what would be safest for the board itself.

Thanks a lot for your responses, I will be happy to prepare few boards I have left within few weeks + we can think how to organize the boards in a larger quantity if there's interest. @erichelgeson The connector comes from Digikey (A34313-ND), the oscillator is a standard DIP-8 sized (but with...

Soldering was not too bad, just a bit boring with that many pins ;)  Yeah, adding a ROM socket would considerably complicate the board (potentially call for more layers) and I think most people will be fine with just a cost-efficient FPU extension. Regarding the group buy - I still have 4...

Hi everyone, I spent some hours of my lockdown time during Christmas and worked on a simple FPU card for Macintosh Classic II. I've bought this little Macintosh some years ago - it just needed a recap to bring it back to life :) Yesterday, I have assembled the FPU board and I'm happy to...

That's great, thank you! I haven't found this one when looking for existing designs with at least basic glue logic descriptions.

I'm new to the forum so first of all I would like to say hi :)   I've recently start digging a bit into the accelerator topics. I found quite some references for 68000->68030 accelerators within the Amiga community - apart from TerribleFire's and Matze's designs that @Frobozz mentioned, you...

I would be also very interested in getting one set if shipping to Switzerland is possible. Thanks for pushing this awesome project :)