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Recent content by Garrett B

  1. Garrett B

    Macintosh SE/30 logicboard recreation (thread revival)

    This is a reloaded board - sorry, should have specified. I did try a different video ROM and VRAM, but haven't swapped out any of the PALs responsible for video. That was going to be next on my list. Keep us posted with what you find out on yours!
  2. Garrett B

    Macintosh SE/30 logicboard recreation (thread revival)

    I'm using 120ns VRAM (don't have any faster to test). What I've noticed is it's definitely worse when using the ATX extender. Almost non-existent when plugged directly into analog board. Additionally, after about a minute of runtime, the symptoms go away completely. Reboots don't affect it. This...
  3. Garrett B

    Macintosh SE/30 logicboard recreation (thread revival)

    Whoa! My board has exactly the same problem. Question- are you using an ATX power cable extender to run the board out of the chassis? Are the symptoms the same after it has been running a bit? I have some theories but nothing solid yet.
  4. Garrett B

    New IIsi project - any tips?

    Cool! Someone has overclocked it to 25MHz and added the heatsink as a precaution.
  5. Garrett B

    Mac SE/30: Looking for suggestions for next steps

    I had this exact issue, but with a Mac Classic. Turned out to be a bad trace to pin 6 of the logic board molex plug (which corresponds to VIDOUT). Ran a small jumper wire to restore the connection and all was good.
  6. Garrett B

    Macintosh Color Display: How did I royally screw this up???

    Wow, I missed this thread and am just reading it for the first time. I applaud your tenacity! The M1212 is one of my all-time favorite monitors, so I would feel the same about not giving up. Really interesitng obsrevation about the G and B drives still being alive, just not recieving any...
  7. Garrett B

    Recreateing the Apple TechStep

    If we are thinking of the same auction, that one sold for $725. I haven't seen anything in the $200 range.
  8. Garrett B

    SE/30 really weird startup sound

    Check it out here: https://github.com/mishimasensei/macse30mlb/tree/master/hardware/pcb/mlb/output
  9. Garrett B

    Macintosh SE/30 logicboard recreation (thread revival)

    Nice work! I'm sure that was a great feeling to see it boot after troubleshooting. Are you booting without the RTC chip installed? I thought that was necessary for proper startup, but maybe not?
  10. Garrett B

    Macintosh IIsi Restoration

    I loved reading through your restoration journey, and seeing all the attention to detail! I do hope you solve the issue with the white display. I am working on a IIsi as well, and am in the process of replacing caps. For the PSU, it looks like you used a 33uf 35V radial in place of the 56uF 35V...
  11. Garrett B

    Troubleshooting SE/30 garbled screen, no chime before and after recap

    Yes, you can use an SE/30 board in an SE chassis (the pinout to the analog board is the same). I get a similar screen you have when I remove the ROM SIMM on my SE/30 board. Not saying that's your issue, but it might be a place to start. These boards can be tricky to troubleshoot!
  12. Garrett B

    Macintosh SE/30 logicboard recreation (thread revival)

    Probably a dumb question but where are you finding your sockets/ports/headers? Are you using peconnectors.com? I am starting a build here soon but still need to do some ordering. I agree that although it might be more work up front, adding a socket would save lots of time in the event of a bad chip!
  13. Garrett B

    Powerbook 180 No Boot

    I had this exact behavior on my 180, and believe I traced it to a finicky ribbon cable connection between the display board and the CPU card. Wiggling at the exact right angle got me a floppy disk and flashing question mark. Interesting how these computers can't boot "headless" i.e. with no...
  14. Garrett B

    Powerbook 520 and 520c Woes

    I agree that the pricing on the power bricks is crazy. The fact that you can buy a laptop and charger for what people are asking for a single charger is wild. I have two 520 model laptops, and both of the LCDs are what I would consider to be poor. Contrast issues like crazy. I am thinking it's...
  15. Garrett B

    Garrett's Finds

    Yes, excited to see it has the maximum RAM preinstalled! And yes, the battery was removed immediately. For giggles I measured the voltage... 0.08, ha. I can absolutely start a restoration thread if there is interest. I have a few Mac IIs I'm working on, a few PB1XX machines, Color Classic, and...