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Well, the inductive impedance is in series between the 88916 and the CPU and it should just keep getting larger as frequency increases, but, despite the danger of guessing without data, I just can't believe the inductance in a straight wire is substantial, even if it has a few bends. The...

I'm speaking from 20+ year-old knowledge, but the traces have small capacitances to neighboring traces and ground/power planes. Small because they distances are relatively huge. Even a straight conductor has inherent inductance. Zc = 1/j2(pi)fC; ZL = j2(pi)fL As the frequecy varies, so too...

Have you removed the heat sink and cleaned off the old heat sink compound which has turned into useless chalk by now? I first ran into this on a 7100. Very similar symptoms, except it would usually finish booting, at least the first time and then crash. One time I saw video artifacts that I...

The badcaps forum has (or had, it's been years since I looked) a few threads on repairing the MDD power supply. https://www.badcaps.net/

Dalbani used to have half a dozen BU406 choices, which left me scratching my head wondering which of them would work well. I never made the time to do the test. In the intervening ten or fifteen years, they seem to have done away with their on-line store and moved to Ebay only. Also their...

You're very welcome, JDW. I'm am happy I was able to help. Do you have an oscilloscope? I am wondering what kind of comparison you would see on your test jig between the DW55 and DW80 chips as you increase the input frequency. Oh, but remembering earlier posts, I guess the limiting factor...

I spent a little time reading the datasheet for the 88916 and didn't see anything that should cause that behavior. I was thinking there might be a pin that sets a mode or some such. Admittedly, I did some skimming and didn't read everything in detail. There's some complication there with...

I find the point at which someone starts demanding that I adjust what pronouns I use to be sexual harassment. I have no interest in what specific gender other people are. Forcing that awareness on me for the purposes of serving up "proper" pronouns immediately sexualizes the conversation and...

It's been like a decade, but a long time ago I read up on the Intel Chipset used in the ATV and IIRC, there is one or more SATA ports on the chipset. The pins just aren't brought out on the motherboard. I could be misremembering, but I think htat's what I found.

Sounds like a plan. Let me know if you need the chips, JDW. I'm happy to help if I can. Is there any experience out there on whether the DW55 and DW80 are interchangeable? If they were actually tested and speed binned then it's less likely, but if they got the manufacturing to the point...

I have a stash of the DW55 :) I have some DW80s as well and could spare you a couple, but I've never confirmed that they're good. I can't remember the source at this point. Too many years. Seems like it was a 68KMLA member, but I'm not sure. Not sure about shipping to Japan though...

If the masks are already available, and will work with one of the fabs at TSMC, it might be possible to get the number under 1000. Of course, that's assuming Freescale would bother. There are (or were) deals available at TSMC where you get two to four wafers and they're processed on a...

On the Turbo601 for the 68030 Macs, the difference between the 66MHz version and the 100 (99) MHz versions was the addition of an ICS9178 clock buffer/PLL chip. As far as I can tell, this chip handled converting the 33MHz bus signal to 3X for the PPC601 -- apparently it does not have internal...

Look at the four ROM chips on the back. They're 44 pin chips about 1.1" X .5". The original 8600 will have chips labeled 343S0280 - 343S0283. (343 might be 341.) The Enhanced 8600 has chips labeled 343S0380 - 343S0383. Also, I believe the Enhanced lacks a cache slot. There should just be...

There was a topic similar to this recently either here of on 68Kmla. Turned out the resistance between power and Ground was normal for that board. You must account for leakage in all the chips that connect between 3.3V and Gnd. 3.3V/28ohm = 100 mA, which does not sound out of line. What...

When you have successfully identified it would you please post a report in this thread: https://tinkerdifferent.com/threads/macintosh-connector-part-numbers.135/

If this interests you, you might try to track down the author of Asterax. I guesss it's a later game, so maybe not interesting in the original 68000 sense, but it's fun and runs really well.

There is some evidence to support this hypothesis. Sun Remarketing was the company selling Lisa hardware forever and other Mac stuff. When they decided to close up they sold lots of 10 and 50 Mac Plus mice on Ebay. I picked up one or two of those. Sold them all for under $10 each. Sigh...

I believe that the 9S08 series is backward code compatible with the 68HC05. The pinout won't match, so an interposer board would be necessary, but it ought to be fairly straight forward to move the Egret/CUDA code to a new 9S08 from NXP. In theory...

I used to do this to my '78 KZ1000LTD. If I forgot my keys, or locked them under the seat, pull off the left side cover, bend a paper clip strategically, insert it in the correct 2 holes on the connectors, and ready to run motorcycle... Amazing that any of those were not stolen...