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Thanks, David! Unfortunately, I don't have another IIsi. I do have a IIci, so I've done some swapping back and forth with those power supplies, and that's where it's really a mystery: The IIci power supply works fine with the IIsi motherboard. The IIsi power supply works fine with the IIci...

I recently got around to trying to fix the power supply from a IIsi I got a while back. I recapped and cleaned everything, of course. I already mentioned in another thread here that I found a shorted diode marked "22UA" that was preventing the power supply from turning on. After replacing it...

Did you try it with the Spanish 1.1 enabler from the July 95 Dev CD? (E-009-2332-A(DT).image). They removed the egg from the 1.1.1 enabler. And they accidentally left the old 1.1 version on this particular disk.

Nice write-up and video, Pierre! I just confirmed it also works on my 6100/60 after the newer ROM (part number 341-0757) arrived. 341-0741 is the original ROM (9FEB69B3) 341-0757 is the new ROM (9B7A3AAD) PowerPC Enabler 1.1 only loads if you have the newer ROM installed. I can tell because...

I don't know what I was thinking when I wrote this, but I was trying to say the 2SK1402A is rated for a maximum of 650V so that's the spec I was shooting for on the diode. My bad on the wording there.

Adding more info to this thread about the IIsi power supply and the unidentified 22UA diode: My IIsi power supply was dead. Of course I recapped and heavily cleaned it before even trying to use it, but that didn't fix it. The symptom was the 5V standby rail was fine, but as soon as I pressed...

Yep, you'll see that text is also in my DingusPPC screenshot. It seems to be drawn by code in 'timd' resource ID 13. 'STR#' ID -16651 contains the text, and the code shown below loads it. Looks like it also titles the window "Paula's Favorite" but you can't see it. I think the Paula's Desk...

Oh that's interesting! So did your 6100/66 have the older 9FEB69B3 ROM originally? I wonder if the 6100/66 didn't need the newer ROM or something. Today I ordered a newer ROM to put in my 6100/60 for fun.

Nice, that's way more complicated than I expected! And I guess the 7100 just always responds with a good ID. I finally ended up reproducing the Paula Abdul easter egg using @joevt 's DingusPPC fork. The magic incantation ends up being to use the newer 9B7A3AAD ROM. With the newer ROM, the 1.1...

I put my 6100 away for the night, so I can't quite remember what it was displaying with that command. It was crashing after displaying the first 4 bytes (no way to limit the DM command to 4 bytes). That's why I was trying a register read/dump with D0 instead. But yeah, sounds like hardware...

Thanks. I was being lazy and hoping I could do it without installing MacsBug (the example commands you provided don't work in MicroBug as far as I know) but I just bit the bullet and installed MacsBug. DL 5FFFFFFC in MacsBug on my 6100/60 returns the same thing I was seeing with my example...

Do you have a fancy way to do this easily? When I do this in MicroBug on my 6100/60: D0 @$5FFFFFFC And then print out D0: D0 I get: A500A500 which doesn't seem right.

I tried hacking the enabler so that my physical 6100/60's Gestalt ID (75) was in the list, but that caused it to hang at the Welcome to Power Macintosh screen just like I saw in MAME. It's probably because I have no idea what I'm doing with the enablers. It seems like what we need is for someone...

The following Gestalt IDs are in that Spanish PowerPC Enabler 1.1's 'gbly' resource (identifiers thanks to http://www.rgaros.nl/gestalt/chapters/ch-06.html): 12 (unreleased 8100/120?) 40 (8100/110) 55 (8100/100) 47 (7100/80) 46 (prerelease 6100/66?) 31 (Paula's Desk Macintosh) The actual...

That’s a really cool find! Excellent sleuthing!

Gotcha. Sorry about that silly suggestion, I am quite unfamiliar with the SE/30 and accelerators so definitely ignore me on that. I just know that I've helped people with Turbo 040 issues with custom ROMs and would definitely recommend keeping the custom ROM out of the equation until you've...

Have you tried a stock SE/30 ROM just to rule that out? I guess alternatively, have you confirmed that the Turbo 040 by itself works with a IIsi ROM in the SE/30? Edit: The part I crossed out is a dumb idea that could fry your board, don't listen to me, see below. The reason I ask is the...

My IIci's socket with metal clips has gotten really loose because of all the testing I did of the SIMMs when I was selling them, so they too can go bad. In my case it's probably just from constantly inserting/removing. I believe the parts are rated for only so many insertions. Yep, and it was...

I hope I'm not necro-ing a thread that's too old, but I was wondering if anyone in here still has a working PowerExpress. I ask because of my and @atax1a ’s recent discovery of the beige G3's easter egg entry method (reformat the RAM Disk with the name "secret ROM image" on Mac OS versions less...

Really nice analysis as usual, David! I had no idea that the power off portion of the circuit had been tweaked in different revisions of the II. That's really good to know. I know that my post from 10 years ago about the power circuit is often referenced by people, so I added a note with a link...