Recent content by Kai Robinson

  1. Kai Robinson

    68kmla MIA

    Just wanted to weigh in here, with regards to anyone thinking of posting here as an alternative, please see our infrastructure overview to get an idea of how TD is setup as a site and what we have in place on the back end. https://tinkerdifferent.com/threads/infrastructure-overview-2021.670/
  2. Kai Robinson

    Tecmar Mac Drive (10 MB) A serial hard drive?! (The first Macintosh external hard drive)

    Looks to be an MFM drive. I'd bet that you're right @JDW in that the drive needs to be low level formatted first.
  3. Kai Robinson

    4MB Macintosh II & IIx 30-pin SIMM's

    I'd love to see the end results!
  4. Kai Robinson

    MacSE analog board issue – squished video, flyback overheating

    The pdf is in the resource section.
  5. Kai Robinson

    Looking for a UH7 and UB10 replacement for Mac SE30

    DosFox on the TD discord reverse engineered the SND chip, check there, the schematics and gerbers may be open source.
  6. Kai Robinson

    Looking for reliable repairs - Recap & pad repair for a Macintosh Performa 460 (LC3+)

    Would help to know where you're based - due to tarriffs putting the kibosh on international shipping right now, makes sense to recommend services as local as possible.
  7. Kai Robinson

    Upgrading Powerbook 190 to 68040 with FPU?

    IIRC @This Does Not Compute tried this with a 540c and....no luck.
  8. Kai Robinson

    Can new PLCC chips be programmed for the SE/30 ?

    If CPU wasn't working you wouldn't be getting a chime, likewise with the GLU - honestly i think it's either RAM MUX/resistor packs, something to do with the PAL logic.
  9. Kai Robinson

    Can new PLCC chips be programmed for the SE/30 ?

    I'd imagine the ROM is fine, given the death chime. When my Iifx went wonky, turned out to be poor oscillator connection and clock signal.
  10. Kai Robinson

    Can new PLCC chips be programmed for the SE/30 ?

    Hi Steve - hope you don't mind me undeleting this - it's a valid question that others might find useful to leave up and around. Also the IIx and IIcx GLUE is the same, iirc, as the SE/30 is a IIcx in a compact chassis with 1-bit video.
  11. Kai Robinson

    Budget Oscilloscope Recommendation?

    As long as you can see the waveform shape and aren't measuring high clock rates, for basic stuff, that should be OK.
  12. Kai Robinson

    DuPAL - A dedicated toolset for reverse engineering PAL/HAL SPLD's

    Hi - I merely posted the link, i've not used the tools - check the link itself in the initial post, which will send you to GitHub and explain more than this thread.
  13. Kai Robinson

    [SOLVED] Macintosh SE works but has no sound

    Checkerboard like that indicates that the CPU is running, it's not being held in RESET and the ROM is working - you're experiencing a RAM issue. Check all the RAM SIMM's are installed correctly, and the jumper is left OPEN unless you're using 256k SIMM's
  14. Kai Robinson

    Macintosh IIci - no life even after recap

    At this point I'd order replacement chips and transistors, they're pennies each.