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My guess is it's the same everywhere and the bit I saw toggling was just a coincidence because that byte (and the 3 bytes before it) certainly looks like an address. From the source you shared, it's a 32bit read/write of offset 0x1040 and a zero skips the test and a non-zero runs it. That does...

Attached two outputs from your tool, one after booting without ram test and one after booting with ram test. ROM version 077d.28f2 checksum $9630c68b

- calls CheckForInitialzation - reads from 0x1254..0x1257 = Link1 - calls RunTests - writes to 0x1254..0x1257 = Link1 Misread the 0x1257 above for 0x1258. My mistake. So then I'm not sure why I'm seeing that bit in 0x1258 toggling in sync with the skip/non-skip of ram tests across 20 power...

Your earlier note had 0x1258 being written to and read during startup - that's why I was mentioning that what I saw was maybe just some of that IO which may be deterministically setting that bit based on whether it ran a ram test or not - and that it wasn't the flag. Yeah, I had patched out...

I rebuilt the batteries on a PowerBook 160 with Sanyo NiCd cells, same size as the originals and it lasted 90 minutes to 120 minutes consistently. The main thing was it only fully charged with Apple‘s external charger. When inside the Powerbook, it charged only partially and lasted 20 minutes...

FWIW, I was using superglue to fix a crack in a yellowed case and found that in under a minute, the area of the case touched by the glue was back to the original color. Tested this again by just putting a drop on, waiting 30 seconds, wiped it off, and it was back to the original color. Now I am...

I counted right.. used xxd and the value I was looking at is indeed at 0x1258. Given it was in sync with the ram test configuration, and based on what you found, I'm guessing what I saw was left over data from the test and it was just holding a 0 or 1 depending on whether the test was run or...

Interesting.. the OS changing the value was what I suspected given it works on System 7 the first time. I also didn't see anything outside of the normal changes to XPRAM from the memory control panel which is why I was looking at the greater NVRAM after your first note. The write on shutdown...

After 6 cycles, I only saw changes in the NVRAM section of DumpNameRegistry, and in that NVRAM section, there were roughly two dozen bytes changing. Looking at the actual bits and comparing it to whether it was a fast boot or a slow boot, I was able to narrow it down to around a dozen candidate...

Haha, fair enough. :) I did use @joevt tool (btw, your library of tools are awesome!) across 6 different power up cycles (3 with memory check enabled and 3 with memory checked disabled). I see various bytes that changed across these reboots. Will be looking at them to see if I see a pattern.

Cool thanks!

Thanks as usual @joevt. For the DumpNameRegistry, is that something that will run in MacOS 8.6 or ? If it's a built binary, I can unzip it fine on my Mac OS X machine but lose any resource forks. I can't for some reason uncompress it on my OS 8.6 PowerMacintosh. Could be something written on...

My Power Macintosh 8500 came with 1GB of memory. Do I really need that much? No. But nonetheless, the massive delay on power up due to the memory check is painful. There are a lot of references to using the hidden option in the Memory control panel to disable this check. I decided to try it and...

Well really glad to hear you're relatively ok!!

Oh no. No worries, more important things in life. No rush at all.

Hey Paul, wanted to check if you ever got a chance to work on that write up? That chip is interesting and wanted to learn as much as I can. Hope you have been well.

Yup, Satin Charcoal Gray.

Quadra 840AV and LC III are finished, and joining the others. Not pictured are my Mac II, SE/30, 512K, Quadra 950, and PowerBook 3400c. Thinned the herd down a bit... for now. Hmm, there might be room for another IIci/IIcx/Quadra700 next to the IIfx... hmm..

+1 point for both the use of Zigintosh as well as Turducken (one of these days I will find the time to attempt to prepare one of these for Thanksgiving).

Welcome back!