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hiki

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  1. hiki

    Macintosh Classic Restoration

    Thanks! I used 40% hair dye developer & saran wrap... I know it's kinda frowned upon, and has the potential to streak, but mine came out looking great. I babysat it for ~1.5 hours out in the sun, making sure to rotate/massage every 10-15 mins. I think the Texas heat had something to do with how quickly it finished! I sure was surprised at how fast the process went. I used a null modem. Basically, I bought an extra mini din 8 cable (the type you'd use for the mac's printer or serial connection), cut it in half, and stripped the wires. Using this excellent guide, I was able to figure out which pins were what (namely TX and RX, the raspberry pi has pins for this). There is a slight problem, however. The Mac Classic uses the RS-422 standard, which specifies the maximum output voltage at 6V, but the pi can only handle ~3.3V (wouldn't wanna fry the pi!). More detailed explanation here. The ELinux wiki seemed a little complicated, so I made a simple voltage divider circuit for the Mac's TX output to halve the 6 volts to down to 3 (as well as adding a cool transmit LED!). The RX should be fine at the 3.3V that the pi spits out, so no need to increase the voltage there (idk if I could even do that tbh). Here's a pic of my null modem cable And a pic of my notes (including the voltage divider circuit) I hope this is helpful. I was really surprised that there's so many resources available online.
  2. hiki

    Macintosh Classic Restoration

    My next little project is getting internet working on this thing... I've got serial communication working with a raspberry pi, but I still need to configure the settings.
  3. Just wanted to show off my finished Classic restoration. When I first bought this machine, the case, keyboard, and mouse were really dirty and scuffed. It turned on, but if you shut it down, it wouldn't boot for a couple hours. I cleaned it up, recapped the logic board, replaced the 3.6v lithium battery, and finally retrobrited the case, keyboard, and mouse. It's also got 4MB of ram now, compared to the 2MB it came with. The keyboard was a pain to completely disassemble.... Before and after pics, I'm really happy with the results!
  4. hiki

    Classic side buttons

    Thanks! Do you happen to know why pressing the Interrupt button caused my files to not show up in the finder? Like I said, they're there... but finder isn't displaying them. It's weird.
  5. hiki

    Classic side buttons

    I've found out that this invokes the system's debugger, MicroBug. I also found a document on how to use it. Still no mention of why my HDD isn't being read, maybe the volume was unmounted?
  6. hiki

    Classic side buttons

    Howdy, howdy! What do the two buttons on the left hand side of the mac classic do? I pressed one of them while the computer was on, the desktop reloaded, and now the OS isn't reading any files from the HDD (at least displaying them). The files are still there.. If I boot from ROM into System 6, I can browse the HDD and see that the files are still intact. I'm confused. Any info would be great, thanks!
  7. Howdy! I am going to be replacing the capacitors on my Mac Classic, however, I've ran into a few inconsistencies with a couple of online guides. MacCaps recommends: 7x 47µf 16V 1x 1µf 16V MyOldMac says to use: 7x 47µf 16V 1x 1µf 50V Does anyone have their take on this? I've tried searching the forum but haven't found any related threads (yet!). Are there any sheets that have links to Mouser parts? I am new to restoration and any help would be greatly appreciated.
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