johnklos
Well-known member
It seems that none of my Centris and Quadra era machines are stable anymore unless they've been recapped. In the last few years I've recapped several motherboards, but even they started showing issues, so now I'll be recapping or replacing power supplies, too.
After recapping my 1U Amiga 1200 (which is now running 100% perfectly without panics or core dumps for more than a month), I was inspired so I decided to do a Quadra 605. Since I have more motherboards than cases (the plastic is SO brittle!), and since I don't have the capacitors I need for the power supplies, I decided to build the recapped motherboard in to a 1U case and use a standard power supply that fits the case:
The Quadra 605 motherboard has had the resistor swap to overclock it to 33 MHz. The CPU is a full m68040 with the heat sink attached using Arctic Silver thermal adhesive epoxy and I added two AAA batteries in place of the 1/2AA. And, of course, it has a 128 meg SIMM and a pair of 512K VRAM SIMMs.
For storage I installed an SCM PCD-50B SCSI multi-card reader. It's limited to async negotiation only, but since Mac SCSI isn't all that fast anyway, it still makes for a very snappy system. It presents each card slot as a separate LUN which Mac OS apparently ignores but NetBSD is happy to use. It's pictured with just one 64 gig CompactFlash in the PCMCIA slot with an adapter (which must be in that slot because the PCMCIA slot is LUN 0, and the Mac won't boot off of a LUN other than 0), but I also added another 64 gig MicroSD in an SD adapter in the SD slot for a total of 128 gigs. If I need more later, I may add yet another 64 gig MicroSD in a Memory Stick PRO Duo adapter, which in turn installs in an adapter to make it fit in the standard Memory Stick slot. I've tested it and it works. Plus, the CompactFlash is in the PCMCIA slot, so I can add another CompactFlash, too. The SCM PCD-50B are neat adapters
The power is attached through a simple SATA power cable which provides just 12 volts and 5 volts. I can't imagine that much would make use of -5 volts, but the speaker output doesn't work and I'm guessing the serial port may not. I'm waiting for some 7905 regulators to be delivered so I can add -5 volts soon.
After running it for several weeks compiling non-stop, I think it's safe to say that it is completely and perfectly happy. Next up is the Quadra 610 with 264 megs of memory and a 50 MHz NewerTech Quadra Overdrive...
After recapping my 1U Amiga 1200 (which is now running 100% perfectly without panics or core dumps for more than a month), I was inspired so I decided to do a Quadra 605. Since I have more motherboards than cases (the plastic is SO brittle!), and since I don't have the capacitors I need for the power supplies, I decided to build the recapped motherboard in to a 1U case and use a standard power supply that fits the case:
The Quadra 605 motherboard has had the resistor swap to overclock it to 33 MHz. The CPU is a full m68040 with the heat sink attached using Arctic Silver thermal adhesive epoxy and I added two AAA batteries in place of the 1/2AA. And, of course, it has a 128 meg SIMM and a pair of 512K VRAM SIMMs.
For storage I installed an SCM PCD-50B SCSI multi-card reader. It's limited to async negotiation only, but since Mac SCSI isn't all that fast anyway, it still makes for a very snappy system. It presents each card slot as a separate LUN which Mac OS apparently ignores but NetBSD is happy to use. It's pictured with just one 64 gig CompactFlash in the PCMCIA slot with an adapter (which must be in that slot because the PCMCIA slot is LUN 0, and the Mac won't boot off of a LUN other than 0), but I also added another 64 gig MicroSD in an SD adapter in the SD slot for a total of 128 gigs. If I need more later, I may add yet another 64 gig MicroSD in a Memory Stick PRO Duo adapter, which in turn installs in an adapter to make it fit in the standard Memory Stick slot. I've tested it and it works. Plus, the CompactFlash is in the PCMCIA slot, so I can add another CompactFlash, too. The SCM PCD-50B are neat adapters
The power is attached through a simple SATA power cable which provides just 12 volts and 5 volts. I can't imagine that much would make use of -5 volts, but the speaker output doesn't work and I'm guessing the serial port may not. I'm waiting for some 7905 regulators to be delivered so I can add -5 volts soon.
After running it for several weeks compiling non-stop, I think it's safe to say that it is completely and perfectly happy. Next up is the Quadra 610 with 264 megs of memory and a 50 MHz NewerTech Quadra Overdrive...