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  1. demik

    Quack: Bluetooth & ADB Mouse "Dongle" for the Macintosh 128/512/Plus

    Hello everyone, I'm pleased to announce a new device for the Macintosh community. This is the result of almost a year of work during the big pandemic. This work was inspired by @cheesestraws Joystick thread, @Kai Robinson tinkering the SE ADB Chip, and the Space Gray Magic Mouse 2 which does...
  2. demik

    PowerBook 520/540/550 Internal Keyboard Pinout

    Hello, I needed this to be done for a R&D project, so in case it's useful for someone else, I'm posting my notes here The PB5xx series have two 16 pins connector for the keyboard. They are standard 1mm pitch 16 pins ribbon connectors. Here is a picture of the PCB below the metallic shield...
  3. demik

    Stealth Macintosh IIcx/IIvx style SFX PSU rebuild

    Hello, I've been asked to post this here on IRC so there it is. A lot of PSUs from this era are bad quality and difficult to repair (if possible at all). One of the worsts is the Astec AA15830 (Apple P/ 699-0392) One of the solution is to use the excellent adapter board by @blusnowkitty and...
  4. demik

    Benchmarking Mac II NuBus Networking (A/ROSE, OpenTransport)

    Hello everyone, One item on my todo list was to benchmark Apple NuBus A/ROSE Ethernet card. A/ROSE is a small Operating System that that runs on some NuBus cards. A/ROSE NuBus cards have their on 68k CPU (usually a 68000 @ 10 MHz) that should offload the main CPU on a Mac II. People reported...
  5. demik

    The beige G3 logic board that wouldn't die (Beige G3 µATX build)

    Hello, This is a little bit of a blog post, if this is more suited to "The Lounge", please let me know. This is the story of my longest running Macintosh (nicknamed Pulse), which is still running 24/7 after 17 years. Intro A while ago, circa 2002-2003, an apple reseller gave me a dead G3/233...
  6. demik

    Reverse Engineering the MacSnap SCSI

    Hello, Noticed a few month ago that the 53C80 SCSI Chip is in life production by Zilog, available new : Mouser link : https://www.mouser.fr/ProductDetail/692-Z53C8003VSG/ COVID helping, I bough a broken MacSnap SCSI on eBay and started to reverse it. I though it will be cool to gave a...
  7. demik

    Radius Pivot cable and diagnostics.

    Hello, Just picked a couple of Radius Pivots for a few bucks. Model 0194. From my memory, they need a specific video card. Found one on eBay, waiting for it. First issue :  no cable in sight for both screens. Anyone got the pinout ? Would a straight DB9 cable work ? Second issue : none of...
  8. demik

    Guide : SFX PSU Conversion for Quadra 630/Performa 6200

    Hello, Introduction : This is a quick guide on how I upgraded the PSU on my Performa 6200. This guide applies to all macs which share the same case (Quadra/LC/Performa 630, Performa/PowerMac 62XX/63XX) PowerSupplys inside this case are an afterthought. They are badly designed and the first...
  9. demik

    PPC601 Upgrade card is not detected anymore

    Hello, The PPC card on my Quadra 650 isn't detected anymore, neither by the PPC601 Control Panel or TattleTech. I tried in a Quadra 800 and no luck either. The regulator get hot (40-50°C by hand), and the CPU get a little colder, so there is power going through it. The thermal paste is bad...
  10. demik

    68000 Coprocessor on Apple Macintosh NUBUS Ethernet ?!

    Was busy cleaning some NuBus cards and noticed something weird on this card. I'm amazed it's there, as usually you will find something more a 68HC05 or 68HC11 performance wise, so it has to do some "heavy" processing. Pictures attached for reference Close view: What it is for ? Something...
  11. demik

    Project: PowerMac 6100 HPV Riser + HPV VRAM

    Hello everyone :)   Introduction Long story short, I got a 8100 a while back, which had some sort of PSU fault which resulted in a dead motherboard (burned area of 4 cm^2 + tons of smoke :O  ). Salvaged some parts of it, included one HPV card (820-0509-A). I want to use this card into my...
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