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Ancient history, but yeah, 128K board came in with the same package type so did the soldered header install. Stock 128K boards were all but useless electronics waste back then and don't get any better when downgraded to pseudo-original status now. If it's been upgraded its a Mac, if it's at 128K...

1977 brought Carter-StagFlation-Oil Embargoes etc. I wonder if much of that differential happened across just the first few of the intervening 13 Years? There's little comparison between 6502/68K periods and today that makes much sense. @Stephen have you refined your design since we last talked...

Yep, did just that. When I got a NewLife board for my 512K I found its CPU package was Killy Klip incompatible so I got a dirt cheap 128K board from Shreve to keep the 512K safe from harm. Soldered it up and chickened out. Took it over to my buddies at Tekserve to test it out. They gave it back...

$3,000 in 1990 is worth $6,801.32 today ;) https://www.in2013dollars.com/us/inflation/1990?amount=3000 High end computer: IIfx/4/40 cost $9,900 in 1990. That would set you back $22,444.37 today.

Yep, mine too. Pop rivets knitting it back together look good in white. :p Posted that fix link for reference. Unfortunately such doesn't appear to be a solution here unless higher capacity caps might do the trick? Inadequate capacitance doesn't bode well for longevity in a PSU.

Forgot all about those! How hard would it be to dumb that design down to 128K/512K status for playtime? Working assumption here is that the less than Plus Compacts are thin on the ground and a bit too precious to hack. A Plus isn't nearly so hard to find and dedicating one for rechambered fun...

https://lowendmac.com/2016/the-duo-dock-tick-of-death/

Again: Mac Plus is the perfect platform for this insanity, who hasn't got one to spare? If you have two, but no spare, put 'em in a dark closet for a couple of months. :p How many of a Plus donor board's components would be drop-ins for insane 128K/512K Rechambered notion? Moved this tangent...

Less sane fork of: https://tinkerdifferent.com/threads/how-much-of-the-128k-512k-hardware-has-been-reverse-engineered.1630/ Mac Plus is the perfect platform for this insanity, who hasn't got one to spare? If you have two, but no spare, put 'em in a dark closet for a couple of months. :p How...

@jajan547 forgot to say thanks for the pics above. Have you got a Plus to post another pic for the series?

Yep, just found that a second ago, thanks. But looking to post the image of the logic board schematic for online reference here in thread for quick reference. ;)

Does anyone have the schematic at hand to upload here?

That's a new one on me? I've collected everything I could about the Duo System. IIRC, the tick of death involved replacing the guilty component with one of higher capacity, so testing what you have in there at present might not do the trick? Is it still ticking and not booting up?

There's a process I don't talk about on public forums to be used if I ever get around to doing an interstitial layer G3 adaptation for my 2300c that seems far better than castellation. It involves little spherical doodads pressed onto the adapter board in rows above each pad. It could be an...

Indeed, thanks for that correction. I was likely conflating two different approaches to DRAM expansion in a half awake state. On board SIMM in the Q605 was confuddled with the IIsi soldered DRAM examples got confuzzled. To further explain/confuse things: 1 - As Kai noted, the onboard VRAM would...

https://tinkerdifferent.com/threads/duodock-power-supply-issue-un-solved-agin.552/post-3241 edit: forgot to say welcome! 😴

ISTR there used to be howtos on how to fix the DuoDock PSU tick-of-death? Fixed mine that way ages and ages ago. Thinking it might have been a diode that failed? Falling asleep ATM, but maybe you can search something up about DuoDock PSU Repairs/Failures etc. out on the web?

Wow, lots of interest stirred up already! Does anyone remember if the developer released info on a memory upgrade card or was it a SCSI card over at the MLA?

Sure thing, comparison will be fun. Wondering how close we might get to 4MB Plus config starting out from original board design? 128K/512K upgrades are something I find fascinating. ISTR a memory upgrade developer releasing all over at the MLA at some point. It'll be interesting to see what a...

LOL! No monkey here, Ignatz runs loose in the lab and Crazy Cat on my shoulder dodges way too many bricks. 🥴