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That's not how anything works. It didn't work that way then, and it doesn't work that way now. In the scientific and academic worlds, people will buy the best equipment for the problems they primarily want to solve. Clustering already existed and worked in DEC's OSes. We still, in 2020, don't...

Oops. I made a mistake - my Sun Fire v245 has 400 MHz DDR, and my AlphaServer DS25 has 125 MHz SDR.

If the 5500 is like the 6400, then 64 meg DIMMs is all you can use. I've tried many kinds of 128 meg DIMMs in a 6400, with no luck.

SCSI is parallel, yes, but each SCSI device is part of the daisy chain. Nobody calls it "Y", though. Things like LocalTalk adapters are sometimes called "Y" because of the pigtail that goes from the part that allows daisy-chaining to the computer, but that doesn't change the fact that it's...

Ha ha ha... No, no. This is completely wrong. Alpha died because it was killed. Compaq bought Digital, then HP bought Compaq, and HP made a deal with Intel to kill off both Alpha and PA-RISC in favor of Itanic. This isn't speculation - it's confirmed fact. Even when Compaq, then HP turned the...

Certainly. Why not? But you never know - it may look worse than it really is. Sometimes it's fun to try to fix things, no matter how far gone :) I had an LC II motherboard that I thought was gone because of both battery and capacitor leakage, but it's running now, and the challenge of fixing...

No. The CPUs marked 33 MHz are made exactly the same as the ones marked 25 MHz. Also, they generate so little heat that you'll never have issues.

Modern RAM speed is specific because accesses can't happen too soon and shouldn't happen too long after data is ready. The speeds have to do with clocking of the data in and out of memory sequentially after the first location is accessed. Old RAM used to just care about overall speed  - if your...

Faster marked CPUs will always run at lower speeds. The performance difference between an 8088 / 8086 doing floating point and floating point on an 8087 is significant in part because floating point performance on the 8086 / 8088 is really bad. It's basically a souped up 8 bit processor that's...

Whether the cable is a crossover or not matters for 10 Mbps and 100 Mbps, so between the computer and the 100 Mbps switch it matters. Between the computer and a modern Mac, it doesn't, because gigabit uses all 8 pins and auto-crosses over. I've had certain older cards not work even when the...

Yep :)

Just make sure you don't lose the receipt. Since most receipts are in email these days, that shouldn't be an issue, but you should know. I bought a 64 meg SIMM from them for $600 in the mid '90s back when people insisted SIMMs that big didn't exist. It had a lifetime warranty. Around a decade...

Oops. Yes, 80 wire, not 80 pin. My bad. That cable that you've linked should be fine, but you'll probably need to drill out the blocked key pin. I know that when I run NetBSD on older IDE controllers, they often downgrade to a slower mode, then become happy, but I doubt Mac OS does this: [...

The 128 gig drive limit has to do with a mode of IDE. It's a whole drive limit, although there are ways around it. Early controllers can, with proper software, see more than 128 gigs. For example, while Mac OS on a Quadra 630 can only see the first 128 gigs, this is primarily because the ROMs...

Do you have another Mac for testing? Or any other cables?

So the jumpers were set to something different than the picture you uploaded? Another thing you can try is to download ZTerm, launch it and select the printer port, set the baud rate, type a bunch of characters and hit return. If the printer prints something, then it's a driver issue. If that...

Your picture appears to show switches 1 and 2 on bank 2 in the open position. According to the manual, this would set the printer to 300 baud. Try switching both to closed, which would give you 9600 baud, which is the default. The defaults, according to the manual, for Americans are: OOOO OCOO...

SCSI-1 and SCSI-2 aren't incompatible. Older Macs can communicate with any non-differential SCSI drive so long as they're cabled properly and terminated properly. For example, I'm using a 70 gig 2.5" 320 MB/sec SCA SCSI drive with an LC III+ without any issues, but the SCA adapter had to have...

There was a big market for them. ATTO made many cards which were used for lots of editing systems and the like. I have many 32 bit, 40 MB/sec UW-SCSI, 64 bit, 80 MB/sec U2W-SCSI, and even some older differential SCSI cards.

I had issues with SetDate, too, on a Quadra 610. I noticed that when the date was wildly off, it would crash the system. When the date was close, it would work sometimes. Haven't found a definitive pattern.