croissantking's conquests
- Thread starter croissantking
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Daniël
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Disregard that, I skimmed the datasheets too quickly and didn't pick up on the fact that the V doesn't have an FPU either, despite no LC or EC naming convention being present
croissantking
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Yes, it’s a bit misleading!Disregard that, I skimmed the datasheets too quickly and didn't pick up on the fact that the V doesn't have an FPU either, despite no LC or EC naming convention being present
croissantking
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Got some bits and pieces off eBay to tinker with.
- Untested Beige G3 board with surprise 750L/350MHz upgrade.
- Performa 631 board with QFP 68LC040 on a PGA interposer.
- 32MB FPM RAM module with 60ns TSOP chips suitable for maxxing out a PowerBook 500 series (or similar contemporary machine) RAM card.
Check out the 040 on the interposer. It looks like a simple 2-layer board. It has some interesting markings on the underside: AMP 560633-1, 511-0063. The date code is in line with many of the other chips on the logic board, so it could have come onboard from the factory. The Valkyrie chip has an even later date code of 9546 – well after the Performa 631 had stopped being produced, so maybe the board was a service part?
I plan to solder one of my 'full fat' QFP 040s onto the interposer and see how it goes; it may even find itself a new home in my spare 840AV board if I ever get that fixed.
I would also like to redraw this design in KiCad and share it with the community so that anyone who wants to in future can convert a QFP to PGA. I don't know how I would recreate the pins, however, can anyone suggest how this would best be done?
The Performa 631 board is badly damaged in one corner due to a battery leak. I'm not sure what to do with it, yet. (Anyone interested in one for a project?)
- Untested Beige G3 board with surprise 750L/350MHz upgrade.
- Performa 631 board with QFP 68LC040 on a PGA interposer.
- 32MB FPM RAM module with 60ns TSOP chips suitable for maxxing out a PowerBook 500 series (or similar contemporary machine) RAM card.
Check out the 040 on the interposer. It looks like a simple 2-layer board. It has some interesting markings on the underside: AMP 560633-1, 511-0063. The date code is in line with many of the other chips on the logic board, so it could have come onboard from the factory. The Valkyrie chip has an even later date code of 9546 – well after the Performa 631 had stopped being produced, so maybe the board was a service part?
I plan to solder one of my 'full fat' QFP 040s onto the interposer and see how it goes; it may even find itself a new home in my spare 840AV board if I ever get that fixed.
I would also like to redraw this design in KiCad and share it with the community so that anyone who wants to in future can convert a QFP to PGA. I don't know how I would recreate the pins, however, can anyone suggest how this would best be done?
The Performa 631 board is badly damaged in one corner due to a battery leak. I'm not sure what to do with it, yet. (Anyone interested in one for a project?)
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3lectr1cPPC
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They’re Alkaline - if anything, it’s surprising that they’re only just now starting to become a problem.
croissantking
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That’s interesting. I’d just assumed they leaked like other PRAM batteries based on what I’m seeing on this 631 board.
3lectr1cPPC
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Somewhat unrelated, but I opened my PM5400 up a few weeks ago to check if someone had pulled the original battery (it had been fully maxed out, including an SSD so I assumed a previous owner did). They did, and replaced it with a 3-AAA holder - great, but they mixed battery types. Two were energizer lithium, the third was an off-brand carbon zinc, which was leaking. Glad I got that checked and dealt with. No damage thankfully.
croissantking
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The CPU on the interposer boots up an 840AV - to a flashing ? at least - I name it the Macintosh LC 840, or Performa 840CD, depending on which market it was designated for. 
croissantking
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I sprayed my 840AV’s 3D-printed CD-ROM bezel using Rustoleum Stone Grey which I saw that @jmacz had used for one of their projects. I was initially just going to leave it as a white resin colour, but it started to yellow in patches and looked horrible. Somehow the yellowing on the Quadra itself doesn’t bother me as much.
It’s come out a lot darker than I imagined, but it’s better than it was before at least. The shade is different enough that it looks intentional rather than a bad colour match, and it looks more premium as well.
The machine could be a candidate for either a retrobrite or a full respray, but I’m leaning towards just leaving it as-is.
I installed an auto-inject floppy (with the correct sled) that I got off eBay for cheap as untested, it works great after a full service. It had a manual insert drive in there before which wasn’t suitable for the bezel. (Side note: I love those F75W drives).
I also stuck an ATX PSU inside the case so I can actually use the computer with the case closed for the first time.
It’s come out a lot darker than I imagined, but it’s better than it was before at least. The shade is different enough that it looks intentional rather than a bad colour match, and it looks more premium as well.
The machine could be a candidate for either a retrobrite or a full respray, but I’m leaning towards just leaving it as-is.
I installed an auto-inject floppy (with the correct sled) that I got off eBay for cheap as untested, it works great after a full service. It had a manual insert drive in there before which wasn’t suitable for the bezel. (Side note: I love those F75W drives).
I also stuck an ATX PSU inside the case so I can actually use the computer with the case closed for the first time.
Nice machine, I'd vote for not painting or retrobrighting personally and I think the bezel looks alright. There is a colour that would be a closer match, I think @cheesestraws knows what it's called.
croissantking
Well-known member
It looks a little different under daylight.
Ahh thanks, you are too kind! I’d chalk it down to the detail you get with a resin print plus the right technique for the spray paint job.
croissantking
Well-known member
If I got the colour right, would there be any interest in 3D printed Quadra bezels?
croissantking
Well-known member
Yeah, it’s the same bezel.
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