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I just made arrangements for a couple from a member over on 68kmla. But thank you for the kind offer. No, nothing so ambitious. The Acard adapters have good, solid performance. Since the 7722 converts to a 7726 and is available for about $25 right now, I'm going to steal the bridge chip...

How will you solder the new one in? Paste and hot air, or pencil and one pin at a time? Or something else? Curious. Good luck.

That's wonderful. I guess the designers put in the extra versatility and let the marketing folks decide how to populate it.

I don't think that will be reproduceable. The Lattice CPLD probably kills the deal. The K5C80 is a Z80 compatible processor made by Kawasaki. ??! I guess Kawasaki builds everything. I loved my '78 KZ1000. The only other notable chip is the 53CF96 which cost about $15 each these days...

I vote for try it. But I'm always in favor of more soldering...

@Kai Robinson But do you have any 343S0182 laying around? :) These are the PCI arbiter chip used with the Bandit (343S0020) on the first generation PCI PowerMacs. I can find the Bandits, but no one seems to have thought that scavenging the associated arbiter was important. Can't use...

:) Can you add break-away tabs on the upper sides so that one can remove them and have a Rocket RAM if one wishes? Red or orange solder mask... :)

Dremel on a stand with a "diamond" cutting wheel might work well too. I cut paired 30-pin SIMM sockets that way.

Ah, cool. I often use the tip of a toothpick in situations like that.

Fantastic. Thank you. I don't suppose you have a link for a plunger and nozzle? Many of the reviews note the lack. I can improvise if necessary.

Would you mind linking to the product you're using to build up mask layer? And is it a UV cure or a two component mask? That sounds like mighty useful stuff.

The 64 pin SIMM socket was also used by Apple for ROM modules and, I think, by Amiga for another type of incompatible memory. Guessing, someone installed something other than a IIfx SIMM in the socket and caused a dead short from 5V to GND. Or something close to that. I have a PM9600 board...

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...