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Recent content by mogs

  1. M

    Rom-inator issues

    I have one if these in my Plus. Also purchased from Kay Koba. It boots fine from the ROMinator when I hold the 'r' key down. Does boot this way? I haven't tried the Flash Tool yet, unfortunately I won't likely get an opportunity to test it any time soon but I'll report back here when I do if...
  2. M

    Trying to fix two Mac plus logic boards

    Thanks, it's taken till now for me to understand how those resistors are supposed to work. I have a pair of 1MB modules from a non working Classic to try. 4x1MB on the way. In the mean time I have the ROMinator and various SCSI gadgets to play with.... Oh, and 30+ years of filth to clean from...
  3. M

    Trying to fix two Mac plus logic boards

    So update, and success! I had a close look at the AB with the macro mode on my phone camera and could see where the solder pins to the connector might have been cracked. So I removed most of old solder, applied flux and re-soldered the pins, trying to ensure I was putting more heat in the pin...
  4. M

    Trying to fix two Mac plus logic boards

    I was going to start a new thread, but I think I'll just jump in here since I also have a mac plus with a black screen issue which may be related. My initial suggestions to your symptoms above. Chequerboard: remove the RAM and clean the contacts. Also, if both boards have exactly the same RAM...
  5. M

    Idea: Macintosh Classic III (LC550+M1420)

    @Trash80toHP_Mini Thanks, it was fun to get to that point, too bad I've run out of working classic 1,2 logic boards. Once the house is built I'll hopefully find time to play with these again. Been watching the logic board recreation threads with interest. I do like the SE/30 style AB form...
  6. M

    Performa 6360, "Input signal out of range" using switchless DB15 adapter

    I get the same issue on my Q605 with some switchless DB15-DE15 cables I have. This is to a Samsung SyncMaster which seems to display pretty much anything the 605 can (with the exception of 512x384, which it does display, just not correctly). It's a shame since it would be nice not to need the...
  7. M

    Idea: Macintosh Classic III (LC550+M1420)

    So putting an ATX connector + audio amp circuitry on to the replacement logic board could mean the AB can be stripped right back to just a (modified) video circuit (+DC-DC boost to 31V for CRT) run from a molex. Then an off the shelf (Pico or SFF) ATX supply can be used either internally or...
  8. M

    Idea: Macintosh Classic III (LC550+M1420)

    The A/B can be considered as three separate systems (PSU + audio + video). I've managed to lobotomize the PSU components and hack in a Pico ATX PSU. https://68kmla.org/bb/index.php?threads/classic-classic-ii-atx-power-conversion.36679/ Was working nicely till the battery rot finally took out...
  9. M

    Cheap and simple ADB to USB converter

    Should be fine, both use Atmega32U4 which is the magic sauce required for emulating USB devices.
  10. M

    Reverse Engineering the Macintosh LC III Logicboard

    The designers get to choose exactly how these two grounds are bonded, maintaining control over the flow of return currents at all frequencies. Otherwise you're leaving it to chance how high frequency return currents make their way back to the power supply. I've actually experienced this...
  11. M

    Classic / Classic II ATX power conversion.

    Merry Christmas.
  12. M

    Classic / Classic II ATX power conversion.

    So it stayed like that until basically two days ago when I found some time to look into it again. In the mean time I ordered some parts, a "PicoATX" PSU that takes an input of 16-28V or whatever, I don't like the look of the 12V input ones, as I'm guessing they just pass the 12V through which...
  13. M

    Classic / Classic II ATX power conversion.

    So... after moving house and finally reaching the end of the year, I finally had some time to look at this again. But a catchup story first.. I did order a bunch of components and try to fix the ABs, I can't remember where I got to with the C1/EAB but the C2/LAB I made some progress after...
  14. M

    Classic / Classic II ATX power conversion.

    Here's a couple of pictures that show what's going on better. I've ordered cables and a different dc-dc to make an adapter harness. Turns out some Lenovos use 14p molex, and ATX adapters are readily available, so I'll just move pins around and splice wires accordingly.
  15. M

    Classic / Classic II ATX power conversion.

    Hello, I am new here. Figured I'd jump in with something outrageous. Preamble: I've acquired a non working Classic and a Classic II with early (EAB) and late (LAB) analogue boards respectively. I have recapped both ABs and LBs.  The LAB would blow the fuse immediately, eventually 'solved' by...
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