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powermax

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  • Gender
    Male
  • Location
    Germany
  • Interests
    Software Development, Vintage Computing

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  1. @Bolle Thanks a lot! Well, I'll think it over and send you a PM.
  2. Hello everyone, I'm currently working on a Power Macintosh emulation project called DingusPPC. Our current goal is to create a virtual software model of the Gossamer HW, that is, an emulator of the Power Macintosh G3. I need high-resolution pictures of the Beige G3 logic board (Desktop or All-in-one). The areas of my interest are as follows: the Heathrow I/O controller and ICs around it ICs near the monitor and Ethernet connectors It would be nice to have clearly readable IC markings. Thank you in advance!
  3. Hello crews, I hope to find someone here who has a working PowerBook/iBook G3/G4 running Mac OS 9.x and who could help me with the hibernation feature in pre-OS X Mac OS. Mac OS 9 does support system hibernation like OS X does ("Safe Sleep"). It seems to work on laptops only - I wasn't able to activate it in my iMac G3 indigo. This feature can be supposedly enabled in the Energie saver control panel. There should be a check box "Preserve memory contents on sleep" in the "Advanced settings" tab. Can someone running Mac OS 8-9 verify if the above mentioned option is p
  4. Hi crews, I've just started uploading a commented assembly for the Cuda Firmware v2.37, see this Github repository. To my knowledge, that's the latest firmware available but we need to re-check it. In the next days, I'm going to put even more docs on Cuda - so stay tuned!
  5. Is it correct that this TDK PSU is more than 20 years old? If so, getting another old unit doesn't guarantee it won't fail, too...
  6. Well, if you can get a replacement PSU of the same type for little money, go ahead! If not, it's worth trying to fix the existing one as I did with my old Astec PSU (still working after been fixed). BTW, a quick ebay search reveals a used TDK 699-0153 for 79,95 € + shipping from Germany to Italy. I bet the fix is cheaper... Another attractive option is to attach a modern PSU with compatible voltages and wattage...
  7. The badcaps forum (what a funny name) has a board dedicated to PSU troubleshooting and repair. You could ask there if they can identify that mysterious component. There are several people around there skilled in the art...
  8. Never heard anything about it. Can you supply some more information on that CUDA Lite chip? Well, CUDA as well as its predecessors (Bit-bang, Egret) is basically a multipurpose MCU that emulates some peripheral bus protocol using the bit banging approach. In other words, all required functionality is implemented in software. To recreate the chip, we thus need to download and understand its firmware. IIRC, Arbee from MAME project may have already obtained a dump of CUDA Lite as he did for other CUDA versions. I'm going to ask him...
  9. Glad to know, thanks! IIUC, I'd need an extra account to access the Wiki, right? Is there any ASIC-related Wiki section there? I didn't see any. Where may I post such information to?
  10. Frankly spoken, I'm out of my depth now. I think you need to gather more data on the failure of your Quadra board. Can you do some electrical analysis of your board and compare the signals it generates with a known working board? That would be very helpful. Otherwise, we won't be able to go a step beyond guessing. Moreover, I don't think that any blind IC replacement would be a good idea, especially when the ICs in question are vintage ASICs you'll probably not be able to find any replacement for...
  11. Thank you for pointing me to FDisasm that I'm aware of. I personally never considered to give it a try because I don't use Mini vMac emulator I never seen any ROM formatting files for the ROMs of my interest (PowerMacintosh 6100 and newer) MAME/MESS offered me anything I need in just one package. Moreover, MAME's source code is a superb and the most complete documentation on the proprietary Macintosh hardware ever available I'm glad to hear that your disassembler offers some annotation functions one could find in only few advanced tools like IDA Pro. It looks like we need
  12. This would be possible if your board had EEPROM or Flash storage. It's a well-known fact that all Apple desktops in the 90s use 3.6V lithium batteries to maintain non-volatile memory. That means that PRAM (NVRAM) is actually a small amount of CMOS RAM powered either by the mains or the battery. In the case ALL power is lost (that's it - the battery was pulled and the power supply is off), the whole PRAM content is also lost. It's difficult to imagine what kind of magic TechToll can do beyond that... FYI, PRAM is a part of the RTC IC (U92). Its part number is either 343S0042 (Motoro
  13. If you're going to gather some knowledge about a specific ROM or ROMs, the question is if the static analysis (i.e. disassembly/hex dump) would be the right tool for the job. You can surely run a disassembler over your ROM dumps. The problem is that the most disassemblers are just dumb tools (the older the worse) - you'll get a lot of night-impossible-to-understand garbage out of them for a couple of reasons, among them: disassemblers cannot fully automatically distinguish between data and code (and Mac ROMs mix them a lot!). This problem has been proven unsolvable, see this discussion o
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