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    Radius Thunder3D no-video output

    Since I have most of my stuff out for shuffling around and testing, I decided to have a go at trying to use my Thunder3D. Unfortunately, it doesn't appear to work or at least it's not putting out any video. I located the Radius Thunder3D installer and installed the software, which is just 3...
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    What OS to put on a Quadra 840AV?

    Howdy, So, I'm going to be repurposing my 8100/100 in my collection, and replacing it in my display setup with a Quadra 840AV. I'll move my Radius VideoVision, SuperMac Thunder/24 + DSP, and DigiDesign AudioMedia II from the 8100 to the 840. So the multimedia workstation display will be...
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    Formac ProQuadra 50 MHz 68040 Upgrade?

    What sorcery is this: https://www.ebay.com/itm/373428484553 ? I grabbed the photos for posterity.
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    Radius Rocket Daughterboards

    I just lost an auction for a Radius Rocket that had the SCSI board on it. The price shot up beyond what I could justify spending since I already have a Radius Rocket w/o such a board. Does anyone have or have pictures of these boards? As far as I know there was the DSP board and the SCSI board...
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    How to get and/or upgrade a SuperMac Thunder/24 to ROM v3.x?

    Howdy, I'm going to be moving my Thunder/24 + DSP to my Power Macintosh 8100/100. I'm trying to create a vintage top-tier Nubus media workstation, so I'm putting the SuperMac Thunder/24 + DSP card, a Radius VideoVision card, and a Digidesign Audiomedia II card in there. The latter two cards...
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    What controls the 640K DRAM video allocation?

    Does anybody happen to know how that 640k is carved off to provide DRAM video on the HDI-45 port? I'm relegated to using the DRAM video on my 7100/80 because I've loaded it up with: Radius Rocket Stage I Orange Micro OrangePC 290 Apple Ethernet NB A/ROSE Reply DoM 7100 PDS So that I could...
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    "Catalyst" vs. "Tsunami" vis-a-vis CPU daughtercard compatibility.

    I have three different kinds of PowerComputing clones. Tsunami architecture PowerTower Pros and two Catalyst architecture derivatives: a PowerCenter (onboard Apple 7200 video) and PowerCenter Pro (PCI Riser integrated ATI Rage II video). I also have a Dual 604e CPU card from Interware that...
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    Does anyone have anything like the MacClip Jr.?

    I'd like to take a whack at recreating some of these "clip-on" variable speed overclocking devices. They seem like a very good candidate for 3D printing a very, very simple circuit design. I used to have one from "XLR8" in a 6100/60 about 25 years ago that clocked the machine to 80+ MHz. I just...
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    1MB L2 Cache Modules Gone Bad?

    So... I've got four 1MB L2 cache modules here for PCI Power Macintoshes & their comparable clones. Two of them work, two of them don't. There's nothing visibly wrong with the ones that don't work. When installed they just prevent machines from booting. Power comes on, but there's no startup...
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    Nathan_A's Vintage Computing Curios

    Well, I'm finally getting around to cataloging all the things I've acquired over the course of the last year or so. I dove into vintage computing stuff as a pandemic hobby. It all started with purchasing a NeXTstation Turbo and an HP 48GX, and then it spiraled out of control as evidenced by my...
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    Power supplies in Japanese origin machines

    Do the power supplies in the Japanese market Macs from the early 90's work on US power specs? I just got a Color Classic II that survived the trip intact and also had one hell of a nice surprise inside that I'll post about elsewhere, but at the moment I can't get it to power on. It left Japan...
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    Cleaning marks off of an eMac?

    Does anyone have any tips on how to clean/polish some marks and scuffs off of an eMac that's otherwise in good working order?
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    Tips for debugging an existing application?

    Hi, I'm trying to debug the Orange Micro OrangePCi application to try and figure out why it will successfully launch the card with a K6-III socketed in it, but it refuses to boot with a K6-III+ in it. It's been a looooooong time since I did any classic Mac development, and even then it was...
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    Detecting memory interleaving?

    I'm trying to figure out how to detect whether or not my PowerTower Pro is actually enabling interleaving for pseudo-128-bit memory access. No matter what I do NewerTech's Gauge Pro just shows that memory is being accessed at 64-bits despite every DIMM in the machine having a matching buddy in...