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There was a time when surplus chips from end of production runs or closed factories or whatever would show up on Ebay and sellers were just happy to have a market. There wasn't a system of folks determining the top price they could get. During that time I stocked up on a number of things as...

I spent some time reading the WD37C65C floppy controller datasheet last night. This floppy controller is found in the Outbound Laptop Floppy adapter circuit board. The board takes floppy commands from the host Mac compatible laptop (SE or Plus ROMs) and sends them to a PC standard Citizen...

If the 6100 adapter is completely passive and passes all the connections through, it should work. The thing I would especially check, is that they didn't put a ground plane on the adapter and then connect all the pins they expect to be ground together on that plane on the adapter. You can't...

TechKnight's design uses SRAM for both models. :D If you feel strongly about using PSRAM on the M5126, I have 310 Hitachi HM658512ALFP-8 512K X 8 PSRAM sitting here.... This should be a good replacement for the Toshiba part, but pricey these days...

@Mr. Fahrenheit Over on teh connectors for Macs thread, I confirmed that the Beige G3 personality slot and the X100 PDS slot do indeed use the same connector. There's also an alternative connector posted there from Mouser.

Do the X500/X600 and related clones use/need -5V on the power supply? According to these two articles posted (but no longer available) on XLR8yourmac.com the answer is no. And given the readership at the time of publication, I assume they would have been corrected by several readers if they...

Term limits are probably impractical for this kind of community organization. For example, if my local rocketry club had term limits there would probably be some years where they couldn't fill out the officer list. People who have time and inclination to devote attention come and go, but I...

Surface Mount X500/X600 CPU Socket AMP 145064-1 Quest also has this in stock: https://www.questcomp.com/part/4/145064-1/16800700 It's been bugging me that we have the through hole parts available, but not the surface mount, and I know some Apple boards used the surface mount. Seems like...

I noticed that on some G3-L2 slot upgrades I have. They must have shopped long and hard to find screws that crappy.... It's kind of like this steak I had at a fancy restaurant in Paris back in '87. They must have labored long hours with great skill to create a sauce that exact shade of...

Demonstration that Beige G3 Personality Slot and X100 PDS Slot are Same: Two photos because I wasn't sure whether with flash and reflection was better or worse than without flash, so dimmer, but no reflections. I should qualify that both the slots use the same connector. They are not...

I keep a supply of modeling clay handy. If there are other components very close to where I'm going to use hot air, I make liitle clay snakes and cover the nearby components. This is mainly to avoid blowing away SM resistors and caps. The first time I used a heat gun on a motherboard to...

Could also be overheating, although that's less likely with a PPC750 than it was with the PPC601. Still, it might be worth checking the heat sink compound.

And in the fine tradition of only finding the answer after one has bothered other folks with the question, I found this datasheet at a vendor who has the SYMBIOS 53C80 available. NCR semi was spun off into SYMBIOS, which was bought by LSI Logic.... None of which are the same as teh...

This is related to my earlier thread, https://tinkerdifferent.com/threads/53c80-experiment.272/ Logic, in their datasheet claims that their 53C80 has better performance: So I actually looked at the pinouts in the Logic datasheet (datasheet attached in above linked thread). And the pinouts...

The term "SCSI voodoo". SCSI works if it's configured properly. If it worked and it stops, it was probably configured wrong and one was lucky it worked as long as it did.

Good luck. Back in 1998 I spent two weeks in the attic during the holidays stringing a half mile of cat 5 and coax cable through the house and dropping it down inside the walls. But these days, my main thought when I consider attic work are the immortal words of the character Roger...

The datasheet for the Logic 53C80 claims Is this a big deal, or just the normal improvement one gets by switching from NMOS to CMOS (5380 vs. 5C80)? It seems like it would be interesting to do before/after SCSI performance comparisons on a Mac II family machine. Thoroughly benchmark the...

So I was pondering the EDO vs. FPM scheme with /OE. And it occurred to me, why not apply that at the Motherboard of the 7200 instead of on just a few DIMMs? But then I remembered that there are multiple /CAS lines to the DIMM. I need to check the pinout for 168 pin DIMMs again, but I'm about...

@Zane Kaminski Thank you for the detailed explanation. I always appreciate the effort you put into education. I also really appreciated the explanation of bus timing for caches on the IIci that you posted a while back but I think that was lost in the great M68kmla fire of '21... I had...

So I've always wondered this and it occurs to me that the folks here might know.... Is the voltage regulator module used in the Beige G3 specific to the Beige G3, or was that a "generic" type of module found in other computers of that age? I'm referring to the plug-in board, not the individual...