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I managed to find a few moments this weekend for 68K projects, this one included. I'm even more optimistic that a provision exists for a hardware modem in the Duo via some as-yet-to-be-discovered signaling method to bypass the Apple Express Modem's SCC-controlled soft-modem layer. In addition to...

Thanks for the insight. I believe I've crawled through every Duo-related Developer's Note and Service Source document available, and the only pinout info I've encountered for the 50-pin SX20-50P-LTS-MH2-2T connector is on pg.58-59 of the general "Macintosh Duo System" Developer Note, however it...

Any chance you've ever had it apart? I'm dying to see what the non-modem equipped Duos have in the expansion slot. There must be something there with at least the power button on it. Could provide some useful clues for my ongoing wifi modem replacement hack attempt :)

Good call out. I've struggled a bit with whether to post something like this here or there. My impression has been that, especially with something very platform specific like this, it's more likely to reach its target audience posted in that platform's specific forum.  For instance, I put my...

Here's an enclosure for a PowerBook PB 1[4-8][0,5]c? li-ion battery I drew. It's expected to be used in conjunction with the locking tab from an original battery. Thread with more details over in the PB forum:  

Well, I couldn't leave this well enough alone. The first battery I built described above is only 3200mAh, and my 180c is a power thirsty beast. I also wanted another pack so my 180 could get in on the fun. Here's my second effort resplendent in all of its 3D printed housing and 7000mAh glory...

Just to close the loop on this, I swapped in the working screen from my other 180c and it works fine. Definitely an issue with the panel. Looks like the LQ9D01A 8.4" panels are still readily available NOS is I decide I want to drop a hundo on one...

Not at all. The Li-Ion dialog was itself a bit of a hijack I merely posted upon request. Very interesting certainly. Would love to scope it and do a little bit banging. If it can manipulate the power manager's behavior, that could open all sorts of possibilities, including possibly overriding...

Sorry to sounds like a broken record on this and the battery, but no. Been slammed with too many other priorities. Hoping to spend some time on it this weekend. It's a long-shot, but based on that hint from the dev note, I'm still hoping there might be a way to signal to the Duo that a serial...

This is awesome! I'm anxious to be one of your first customers or help beta test if desired. My 512K has a MacSnap 548E and Plus ROMs, but I've never been able to track down a real MacSnap SCSI to go with it.

3S (3 cells @ 11.1v) and 1A. The Duo power supply seems to limit charge current to around 600ma, but that's fine.

I believe the PIC-based board you're referring to is just BTI's answer to simulating the Apple proprietary ID chip. Look how it's connected. The thermistor and ID chip share a common leg (pin 3): Thermistor between cell D and E and read by the Duo on pin 3 & 4 (left to right), and the ID...

Happy to help any way I can. My final post in the linked thread is before I added the boost converter (just a cheap-o pre-built 5A module from Amazon) as a replacement for the 2nd ideal diode, but it's otherwise accurate. Aside from the fixed voltage output caveat outlined above, it works great...

12v nominal perhaps, but charged voltage per the Service Source is indeed 13.5vdc: Build a battery that outputs only 12v fully charged and you'll have low-voltage warnings and to look forward to :)

I'd really encourage a thorough read through the thread I posted above. Questions about voltage, intelligence, charging: all answered. It's not a 12v pack (charged voltage is 13.5v according to the service manual). Yes, it has some "intelligence" in the form of an ID chip that looks like a small...

It's an artifact of the boost converter I installed to combat the Duo's low voltage cutoff @ 11vdc. Without it and under load, that'd leave ~50% of a 3S pack's usable capacity inaccessible unfortunately. I meddled around with the PRAM values and it doesn't appear LVC is adjustable--probably...

Here ya go :) It's still working great. Be sure to use a BMS and CC/CV charger if you build something similar!

Either should work electrically. These old laptops are pretty power hungry though, so the more capacity the better. It the 2100s will fit, I'd go that route. I'd see if I could find some with tabs though. E.g., https://www.onlybatteries.com/showitem.asp?ItemID=16458.31&cat1=50&uid=1910

Hi Friends, Over the weekend I decided to see about getting my "parts" 180c up and running. I purchased it with a pre-existing screen condition alongside a 180, and although I combined its best bits with my other 180c to make a single, very nice unit, this one is complete and really not too...

Take a look at this thread: I recently went down this road on my 180c and it's 100% possible. I'd use a narrow pitch cable with stranded conductors for maximum life. I used an old 68-pin SCSI cable for instance As for the pinout, I don't think you really need to fret over it. It's direct...