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    Near Chichester, United Kingdom
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    Vintage Macs, Programming, Retrocomputing, Electronics, Train/Flight Simulation, Speedcubing, Etch-A-Sketch Art

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  1. I've often wondered if it would be possible to replace the PRAM with one of those flash-overlaid RAM chips that save their contents to flash on power-down. Unfortunately I think the PRAM chip is a custom part.
  2. It's a long shot, but try changing the order of the SIMMs. Those are the long thin cards that rise up from the logic board, and there should be some kind of clips holding them in place. Release the clips and slide the card out. Take them all out and put them back in a different order. That will tell us if it is a faulty SIMM.
  3. Have you thought of posting it on github? You're likely to get a lot more contributors that way (and those who do make changes are more likely to give them back to you).
  4. Yeah but I still don't have the disks.
  5. Sorry it's taken me a while to get round to posting this but about a week ago a friend of mine was trashing an old PC and I went round to his place and took all the bits that I wanted. Most interesting was an internal IDE Zip 250. I don't have the disks for this thing and it's not really a Mac thing, but just an interesting piece of tech for my collection. Still, I wish it could do more than just sit on the shelf...
  6. Just don't open the thing and then find out that you don't have the right system to run it on... then you'll be sad.
  7. Seriously that disk looks beautiful. I'd try to do as Unknown_K suggested and try to get another (or an image) if you are interested in trying it out. However if it turns out that you are unable to get another one given a reasonable length of time, and there are no locatable images of the disk, then for the sake of software preservation it might be worth your while to open it and image it. Maybe make an unboxing video, or take plenty of pictures (heck, you could even continue the unboxing to include installation and first impressions on an appropriate system, if you have such a system)?
  8. I wasn't sure which was "the source code" file for the CPLD, otherwise I would have probably found what you are referring to. But I did find the information that I needed in the documents provided by one of the previous posters. I was using a microcontroller to implement the floppy drive functionality and I was going to use a system involving a way to signal to the user to eject the disk and then have the microcontroller wait for the disk to be removed before it will raise the "disk inserted" signal again on the Mac side. For the head stepping thing I was going to implement a "safe" pre-
  9. So? I want something that: -uses real floppy disks and and old PC drive that I had lying around -doesn't cost 89$ -can be built using parts from my existing electronics collection
  10. Actually I think that document gave me what I was looking for.
  11. I am not programming the SWIM chip. I am trying to be the floppy drive, with the SWIM chip programming my registers. Therefore I need documentation on what registers are in the floppy drive itself.
  12. I'm trying to find documentation for the internal registers of the FDHD. I've seen numerous references to there being internal registers in the FDHD, but the only details that I have been able to find regard the registers in the SWIM chip (or some other associated part), not those in the FDHD itself. I'm guessing that the information must be out there somewhere, as obviously BMOW must have needed that for his Floppy Emu. I have tried to reverse-engineer his CPLD design, but I am not familiar with CPLD design tools and it would be much easier to just read the relevant original documentation
  13. It is more likely that the OS does not contain the right stuff for your LC (system enablers, extensions, and device drivers within the system file) than that the disk is to blame.
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