• Updated 2023-07-12: Hello, Guest! Welcome back, and be sure to check out this follow-up post about our outage a week or so ago.

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    Tokamac build and programming XC1736 chips

    Probably not useful, but the Xilinx XC1736D is on the list of supported devices for the Needham EMP-30 programmer. That's a very old programmer. Needham went out of business in the early 2000s. It was a $1500 programmer in its day, IIRC.
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    How do I force my Mac Plus to actually, correctly, identify the size of the hard drive in my external PLI drive.

    @robin-fo 's advice is good. I thought I would offer one theory on why the drive is behaving this way. Many third party formatting softwares allow one to create multiple partitions on the one disk and then select whether the partitions are visible on boot or not. A utility which came with...
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    Transformers for homemade LocalTalk/PhoneNet dongles

    I have a Focus Turbonet Phonenet connector here, and on the back it says it was manufactured under license from Farallon. This is one of Focus's early ones. Later they switched to a box without the sloped front and added a termination switch, so the little plugs with resistor could be...
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    Sourcing Legit MC68882 FPUs - Data

    Thank you, gentlemen, @Phipli , @zigzagjoe . I appreciate the reassurance. I wasn't too worried for the reasons you mention and I'll find something I can test them in before applying any solder. I mostly posted to add another report to what's going on. At the price they sell these for...
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    Sourcing Legit MC68882 FPUs - Data

    I think I may have bought fakes for my SE/30 reloaded boards. The date code on all of them is QEED0823, which puts the year before the week, and 08 is later than any of the dates in the table. Unless they were made in 1923. Also the emblem is Motorola's not Freescale's. Mask label is...
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    Adding 8 slots to my Compact Mac

    I'll get in my time machine and get right on that.
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    Adding 8 slots to my Compact Mac

    78759... Heh. I live less than 5 minutes from where their office was way back when.
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    The Pro Audio Spectrum 16 NuBus's YMF262 FM synthesizer...

    Okay, I had all the disks in my floppy archive. Years ago I copied all my floppies to disk images. I put them here: http://sphinxgroup.org/PAS16/ Let me know if the images work. They should just be Disk Copy images. If there's a problem I can binhex them or something. I also had an...
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    The Pro Audio Spectrum 16 NuBus's YMF262 FM synthesizer...

    I will see if I can find it and hope the floppy drive is still working. I haven't tried it in a while. I know it's around here somewhere.... I may have a copy already archived to a hard drive in which case the process will be easier.
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    The Pro Audio Spectrum 16 NuBus's YMF262 FM synthesizer...

    Not anything of note to contribute, but will note that my PAS16 did come with a copy of "Out of This World". It always felt like it was a powerful piece of hardware with no real drivers or software to support it, back in the day. It will be cool if you unlock its mysteries. 30 years...
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    Macintosh IIfx logicboard recreation

    Amazing work!
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    DIY Mac Plus ROM Chips (Giveaway)

    It's a great article. But... My main quibble and it's pretty much a nitpick is that it sort of implies that an XGecu programmer is required for the process. On the other hand, the instructions are for someone using an XGecu. But the same procedure can be done with other programmers...
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    "Catalyst" vs. "Tsunami" vis-a-vis CPU daughtercard compatibility.

    Forgot to mention, the S900 and J700 motherboards have identical form factors (they're the same board, but populated differently). The desktop case of the J700 and the tower case of the S900 are actually the same model of case from Palo Alto Products, the ATCX Convertible. The drive cage is...
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    "Catalyst" vs. "Tsunami" vis-a-vis CPU daughtercard compatibility.

    Power Computing made its Catalyst clones* with a CPU slot which is identical to the Apple PowerSurge (X500/X600) CPU slot, except... There's one signal missing on the cards. I can't remember which one. I'd have to dig through email from the early 2000s to find it. Anyway, CPU cards from...
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    Soldering new vram onto Quadra 630 motherboard?

    Very cool. Did they ever use this newer Valkyrie design in any machines? Unfortunately, it doesn't seem to do a contrast/compare with the original Valkyrie, so impossible to know how different it is. I think I have a couple thousand of those SGRAM chips in the attic...
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    SCSI for Dummies Thread - How to properly use SCSI

    That's the article I wrote way back when. By today's standards, way too much detail on the soldering and probably some of the (soldering) details are bad advice. But it is more than 25 years old, so... But there was also discussion in the forum regarding specific cards and firmware versions...
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    Soldering new vram onto Quadra 630 motherboard?

    Because these are DRAMs, they interleave the addresses. So adding one address line would add two address bits to the address space. So, if a tenth address bit is available, one could address 1M X 16 (these are 256K X 16) chips. Finding 16 bit wide memory chips is not easy. Alternatively...
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    Do 32-pin, 400mil SOJ sockets still exist?

    They're great. They have weird sockets like the ROM/cache sockets for many old world PCI Macs (x500, 6400, 6500, X100 PDS, G3 Perch). Oh, also a large stash of the 64 pin SIMM sockets. Quest is also great. They actually have stock of the X500/X600 CPU sockets in both through hole and SM...
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    Attempting to patch the SuperMac S900/Umax Pulsar's Open Firmware with "The Great Gazelle PCI Hack"

    Whether the Bandit is "seen" at F2000000 or F4000000 seems to be determined by how pins 186 and 187 on the Bandit are biased. In other words, the Bandit's address changes as the bias on those pins is changed. I think. Could be wildly wrong.... Because the PowerSurge architecture was...
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    Replacement Power Supply in Quadra 605

    I think that Phoenix Connectors also has those connectors. At least, I remember sourcing some for adapting ATX PS to the Umax S900. I'm not certain I got htem from Phoenix.