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Quadra 700 - 68040 33mhz or 40mhz upgrade
- Thread starter AlpineRaven
- Start date
I think I'm going to socket in a 66.66 MHz crystal for 33, until the QuadDoubler clone project picks up again. I figure I have a decent 040 to throw in that, if they sell the boards sans CPU. I think the 35-37 MHz range might just be too unstable to be worth it, not to mention the fact I couldn't find a through-hole package of a 70-75 MHz oscillator. Output Enablers' ordering doesn't seem to work also. Are they long-gone?
The only problem I'm running into is the size... I'm going to search again, but so far, the only in-stock 66.66MHz oscillator is half-can size, so I'd either need to modify the 14-dip socket (just a connection bridge), or just wait for a full-can component. The number for the full-can 66.66MHz crystal is "ECS-100A-666". I did find a full-can 64 MHz, which I guess is only 1 MHz short of 33...
My only concern with the socket stacking (I guess that's option 3?) is height considerations. It's not terribly expensive, so I'm planning on buying both the 64 and the 66.66 crystals, a 14-dip socket and a few 8-dip sockets and then stack a few pin header under the tallest part. (That's probably a) not going to fit and b) look really bodgy
The only problem I'm running into is the size... I'm going to search again, but so far, the only in-stock 66.66MHz oscillator is half-can size, so I'd either need to modify the 14-dip socket (just a connection bridge), or just wait for a full-can component. The number for the full-can 66.66MHz crystal is "ECS-100A-666". I did find a full-can 64 MHz, which I guess is only 1 MHz short of 33...
My only concern with the socket stacking (I guess that's option 3?) is height considerations. It's not terribly expensive, so I'm planning on buying both the 64 and the 66.66 crystals, a 14-dip socket and a few 8-dip sockets and then stack a few pin header under the tallest part. (That's probably a) not going to fit and b) look really bodgy
I have a memory that someone on these boards managed to get in touch with Marc Schrier and he was still willing to sell any old stock he had. The memory is vague. Might have been a dream...
No worries. I emailed the "sales" email on the site, and it hasn't bounced back, so perhaps I'll get a response and I'll post the status of that here.
FYI, this is the response I got back from Marc:
So looks like email is the way
No problem! Nice to know he's still got that going on the side.
Got them Friday (decided to get both 66.666 and the 71.7948, just to see). and the rest of everything should be here Monday. Also got a solder sucker, so hopefully that plus heat gun makes easy work of the through hole connections.
I'll also have those last two values of capacitor that I missed in my initial inspection of the power supply (but rectified in the parts list), then a working Q700.
Short of finding a TechStep, is there a program that would test the sundry aspects of the system that might be disabled/impaired by an OC over 33 MHz? That wouldn't be identified with a MacBench test or even the Apple Personal Diagnostics? I suppose the only thing relevant to me would be floppy drive control (I'm guessing it effects floppyEmu just as it would a physical drive), ans I don't recall if it does, but perhaps Ethernet.
Got them Friday (decided to get both 66.666 and the 71.7948, just to see). and the rest of everything should be here Monday. Also got a solder sucker, so hopefully that plus heat gun makes easy work of the through hole connections.
I'll also have those last two values of capacitor that I missed in my initial inspection of the power supply (but rectified in the parts list), then a working Q700.
Short of finding a TechStep, is there a program that would test the sundry aspects of the system that might be disabled/impaired by an OC over 33 MHz? That wouldn't be identified with a MacBench test or even the Apple Personal Diagnostics? I suppose the only thing relevant to me would be floppy drive control (I'm guessing it effects floppyEmu just as it would a physical drive), ans I don't recall if it does, but perhaps Ethernet.
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