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Wow. Great price on those. I'm not surprised they're all gone.

If you perform this experiment, please let us know.

And as it turns out, I didn't find the answer. The QFP 53C80 in the datasheet attached to the previous post has 48 pins. The QFP 53C80s I received have 44 pins. So I still don't know whether they match the PLCC pinout. Sigh.

If you can find one of the old SIMM Doublers for 72 pin SIMMs, you can stick two of them in the Q605/LC475. Of course, you won't be able to close the lid... I actually tested that with the HP D4893 128MB SIMMs. I don't know if it will work with the Memory Master's. Some of them seem to...

Hmmmm. If I got a 17X17 socket, poked all the pins out, and replaced them with those DH2-?pins, that would pretty much make a ZIF header. I guess. One of these days I'm going to dissect an old 233MHz PPC750 ZIF and see what the interface between the PCB and the header looks like.

alxlab already answered, but I'll mention that the socket is called out in section 1.8.5 of the attached specification. Now, can we find a pin header for the 288 pin PGA socket? There's folks who would probably make one for us, but I bet they'd want a huge quantity. The header is going to...

Not a project, but an Acard SCSI-IDE adapter and an IDE drive work pretty well for a lot of things. The 7720 (narrow interface) used to be available for less than $50, but now days the whole line of adapters are priced very high -- more than $200 for new devices. Sigh. The 7722 is available...

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...