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About powermax

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    Software Development, Vintage Computing

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  1. Okay, let's get back on track. I would like to know if someone owning a PowerMac 6100 can play back audio CDs using the internal speaker. I'm going to check next if I can record CD audio with an audio recording software. The Sound control panel allows to select "Audio CD" as sound input device.
  2. Yes, I have the audio wire installed. Can it be a driver related issue?
  3. Yes, I did. I attached headphones to it. I hear alert sounds but no CD sound.
  4. I haven't tried it yet. The drive doesn't have any audio jack. It only has a connector marked "Audio out". It's rather difficult to attach a regular speaker to it without a special cable.
  5. Fellow Macintosh enthusiasts, I recently recapped an old CD-ROM drive in my Macintosh 6100/60 AV. It seems to work fine reading all CDs/CD-Rs I put in. When I insert an audio CD, the drive seems to play it back but I hear no sound. All controls in the Apple CD player including starting/stopping of playback, jumping between tracks as well as ejecting work flawlessly. The audio cable between the CD-ROM drive and the motherboard is attached. The internal speaker is confirmed to work either - I hear the startup bong as well as alert sounds. Volume control also w
  6. @LaPorta I always do an incremental recap replacing caps one by one while double-checking every change and ensuring that everything is installed and soldered properly. I also thoroughly clean the board along the way. I've also learned it the hard way by sacrificing one power supply and one PowerMacintosh board.
  7. I'd pull out the PSU, disconnect all devices attached to it and check the voltages then. What part number do you see on the PSU? It's sometimes possible to find the schematics for some PSUs used in the old Apple machines. BTW, I successfully fixed and recapped an ASTEC PSU in my PowerMac 6100 three years ago...
  8. Thanks a lot for this helpful guide! FYI, my Sony CDU561-25 has a bigger board with the spindle motor attached to it instead of that small board (see the attached pictures). That's probably due to the fact that my drive is an internal one that comes with the PowerMacintosh 6100/60Av. I'm somewhat reluctant to take out this bigger board. I don't want to damage the spindle motor...
  9. I'm recapping a Sony CDU-561-25 as well. One only needs to remove six screws and the cables on the side in order to take it apart. I also can share photos of the whole process. Be careful to not damage the surrounding components when removing the stock caps. Pay a special attention to NOT touch the small trimpots on the controller board (laser adjustment). I don't know what happens otherwise. The drive will presumably become unusable. I saw this guide too but I want to point out that the replacement tantalum caps recommended there aren't properly derated.
  10. @LaPorta I'm late to the party. I hope you haven't destroyed it yet I'm currently recapping a 300i drive taken out of my PowerMacintosh 6100. It's easily torn down. What manufacturer and part number do you see? Mine is a Sony CDU-561-25 caddy loading CD-ROM drive.
  11. @Kai Robinson I don't want to make any pressure but is there any chance for us to follow such a decapping session someday? I find the idea super exciting
  12. @Kai Robinson Are the higher resolution images of the ADB chip die available? I'd like to attempt to reverse engineer its firmware (I have some experience with reversing ADB devices. You can look at my current work on reversing and documenting the Apple(extended) II Keyboards here)
  13. You need to simulate the CUDA communication protocol to achieve that. The whole task boils down to programming a FSM. It is surely doable and was modeled in software several times. How easy it's going to be depends on the hacker's skills
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