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Found 5 results

  1. After the recent revival of my Lisa 2/5 I decided to drag out the Mac512K with the General Computer HyperDrive. I picked this up at Goodwill back in the '90's. (1996 if I can believe the file dates on the HD. That's all I have to go on.) I think I paid $120 for it maybe. (That may be what paid for the Lisa, I just don't remember.) Interestingly, based on the serial number this system started its life as a 128k but the badging on the back says 512 and it has a 512K MB. But who knows, maybe the original owner had it upgraded when the HyperDrive was installed. It was working and I thought it was kinda cool. I knew it must have cost a fortune when it was new. Anyway, after messing with it a bit I put it away and it's been sitting since '97 or so. So I pulled it out and tried to fire it up last week. The mac booted up ok but the HD drive wouldn't start up. Long story short the power supply for the General Computer piggy-back card and the HD was only putting out ~7v or so. There was nothing visually wrong with it, no leaky caps, etc. So while I was googling around for info I ran across LuckyBob's forum post here about his Mac Plus with a HyperDrive. He mentioned using a Meanwell power supply so I got to looking at Meanwell's catalog and after a couple of false starts I discovered that their PT-65B looked like a drop-in replacement for the original Hyperdrive PS. It was, right down the exact same dimensions! The only difference was the ground used a spade connector rather than the Molex plug on the input side. The output side pin-outs are the same but flipped. So after after carefully reassembling everything I held my breath and flipped the switch.
  2. Hi all, I've got a Mac 512K which is having sound issues with the speaker. Tried hooking up a speaker to the external audio jack, and while I do get audio, it's somewhat attenuated, and I have to crank up the volume on the speakers to hear it. Unplugging from the jack, I'm able to hear sound from the speaker, but it's very faint. (Unfortunately, I don't have a disk to generate a continuous test sound, so I'm just booting Dark Castle, and letting it play the intermittent audio from the splash screen.) One other odd thing: Seems like I'm getting some sort of feedback from the disk on the audio signal, as changes in the drive motor speed, or head movement are generating short beeps out the audio. Tried a MacPlus logic board with the existing power board, and that works fine, at least telling me the female side of J7 and the cable to the power board (and thus the speaker) are fine. Also, I was able to probe PA0:2 (pins 2 thru 4) of the VIA and see them all asserted. Thus, the paths in the 4016 for the three volume-adjust resistors are all active, effectively setting the volume to its highest. (Verified this by tweaking the volume settings in Dark Castle, and saw the changes reflected in the VIA pins.) Thought it might be the external audio jack, as I believe it has some mechanism to cut out the internal speaker when an external is hooked up. I do, however, get continuity when checking between R7 and R1, with no external speaker. So, seems like that's not an issue. Any thoughts? Without another Mac 512K logic board to probe how things should be for a working board, I'm somewhat stuck.
  3. By posting this inflammatory thread I know the flames will rage high! So let it burn! Ha! Lets throw hats and chew the fat, discuss about experiences and techno-babble, and explain why it is to you. I surmise that the SE\30 will rank high, though it is not without its problems: Recapping and Cap Goo Trace Rot being the worst of them. But the SE does not have these problems though they have most of the same components. Then you have the Classic and Classic II. Though the Classic will rank well along with the SE as a 68K machine, the Classic II is another issue altogether. Then there are the 128K, 512K, 512Ke and Plus. Many good things can be said about these machines, but the biggest put down I guess will be the analog board and the issues they bring. The Beige Case can also be an issue in yellowing as well but there were a Platinum 512Ke and Platinum Plus as well. I own the 512Ke, Plus, SE\30 and the Classic II - all with their pluses and minuses and think that for their designs, they were and still are great machines. Though my first Mac was a Mac IIcx (which was later modified into a Mac IIci), my first Classic Compact Mac was a 512Ke with a SCSI/RAM/16MHz Accelerator from I believe Dove Board. Then I got a SE and a SE\30 a few months after that. And from there my collection grew. The Classic II I recently found in the trash (Summer of 14) and I rescued and repaired it - my first Compact Mac Repair in about 20 or so years! Care to thrown in a PowerBook? Explain why it fits. The Duo 210 if thrown in fits between the SE\30 and the Classic II, as all three has the 16MHz 030. The Mac Portable lines up with the Mac SE. I got a lot more to say and share but I'll post it later and end this here. This is just an introductory post to get you guys posting.
  4. bom.cabedal

    Keyboard cable for 512K Mac

    Hi everyone, Tomorrow, I'm going to pick up a (non-upgraded) 512K Mac that someone needed to get rid of (fine with me). It is a good-looking machine, and still works. There are two parts failing, however: the mouse (which can still be had off eBay) and the phone-style keyboard cable. I have some difficulty tracking the latter; can anyone here offer advice on where to get a specimen?
  5. napabar

    Apple Watch to Mac 512Ke

    Check out my latest video. I successfully got an Apple Watch and a Mac 512Ke to share files!