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@Zane Kaminski ROM Apple part numbers on the Q840AV are 341S0923 and 341S0924. Does the 660AV use the same ROM? If so, I would guess that the chances of success are excellent. I guess they could have programmed in a machine ID branch, but why would they?

I have a gas range/oven from 1969. Not an option for folks who don't have gas in the house. But nothing electric to blow out. The control knobs are all gas valves. Not electrical controls connected to a failure-prone CPU that might or might not agree to operate the range/oven for you...

I've done that many times -- forget to hit "Post reply". I get such a feeling of accomplishment from finishing my thought coherently (I hope) that it never occurs to me that I need to hit the submit button. Or maybe the cat distracts me a critical moment....

Yeah, I've tried paste with no stencil in the past and mostly made a mess. It's made me reluctant to try it with a stencil. I gather that (with stencil) works out better for you? That's a lot of pins to solder by hand, although I expect you'll get into a rhythm and it will go pretty fast...

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...