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North Hedge Ned

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  • Gender
    Male
  • Location
    Ontario, Canada
  • Interests
    Vintage Tech

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  1. North Hedge Ned

    Help revive an Original Macintosh Prototype

    Dog Cow - thanks for the expert confirmation of the ROM - helps round out the history and description of these machines. Not sure how to take your other comments about "end up in the hands of people who are not equipped", etc. This is why I have come to this forum, and why the other contributors assisted in understanding what these computers are.
  2. North Hedge Ned

    Different Macintosh in Original User Guide?

    olePigeon, thanks for chiming in. Information I gathered from emails exchanged with Jerry Manock, who was the case designer, confirmed that these were likely just after the Twiggy and just when they started to use the Sony drives. Manock stated to me that there were likely soft tooled, just before they ramped up the Freemont factory. Since the logic boards are the same versions as the Twiggy, my two system are likely former Twiggies with the innards changed (Sony ROM too) and a different faceplate, of which has PTA Prototype stamped inside of it too. The Sony drives are not full release either, with handwritten numbers on them like the rest of the proto parts in the units. Just might reach out to the VCM that you mention - never know. Strange that we have not seen more of these units. I have two. They were gathering dust on the shelves in the warehouse of Apple Canada in Markham. I worked there and struck a deal with them to get my hands on them - a work in lieu of cash deal. Attached are the photos of the Sony drives...
  3. North Hedge Ned

    Help revive an Original Macintosh Prototype

    Dog Cow - thanks for the info. Now to really get together some old Mac's and 400K floppies! Have to get MacsBugs installed on one with a system. Maybe too, I can boot from the internal floppy with the system I have, then run an external floppy with MacsBugs, and CopyROM (thanks @LaPorta) for that link. Below are photos of each of the 512K adapter board that is on the logic board of these units. Any clues here without running MacsBugs?
  4. North Hedge Ned

    Help revive an Original Macintosh Prototype

    Hi everyone - the story still is unfolding on this and the other unit that I have - truly Prototypes as most of you confirmed - for sure. They have 512K RAM, to boot! I have a question though. Two actually: Could anyone tell me what to use and how to read the serial number from the logic board like the modern System Profiler? I want to know what serial number can be pulled from the logic. Secondly, is there a software that I can run on the unit that will copy the ROM 7.0 off the daughter card? I would like to be able to have the ROM locked in time and preserved. Thanks in advance.
  5. North Hedge Ned

    Different Macintosh in Original User Guide?

    in the new thread as indicated, but I wanted to add some new data that I have uncovered to "close the case" so to speak. Both units have the #6 revision logic board as per folklore.org. Part number 820-0086-00. May 1983. ROM 7's so close to final os possible, but the Sony drives are pre-release. Waiting to hear back from first-hand sources on then they figure these units place in the timeline - likely the start of the Sony drive option process. As others have pointed out: The cases are genuine prototypes, even the venting is different between Twiggy units, mine, and production 128's. Looking to find these units' places in history right next to the Twiggy's, or is it Twiggies?
  6. North Hedge Ned

    Help revive an Original Macintosh Prototype

    For the original post and more pix of the unit
  7. North Hedge Ned

    Help revive an Original Macintosh Prototype

    Hi everyone - still have not had a chance to dive into the repairs - time and money are both short right now. Anyone in the Ontario, Canada area who may want to lend a hand with their know how? As for the working 128 Prototype, I did find out some more specifics - actually both of them - working and on-working: They are both units with the #6 logic boards as per Folklore, by the identifier of the Mr. Macintosh all over the place, and part 820-0086-0 - made in May 1983. I am in current conversation with one of the original designers now to gain more information and insight. To my understanding, this is the only era with the Mr. Macintosh. My photo's must have been just after Apple abandoned the Twiggy prototype. This is what I want to confirm. Lastly, then, I wish to sell the working one now. Before I unleash it on eBay, which might cause a frenzy, anyone here interested, have the money, and is interested? This unit would be next-in-line to that Twiggy version that is all over the web. Thought that I would do the respect of asking here first. $10K US - am I nuts?
  8. North Hedge Ned

    Help revive an Original Macintosh Prototype

    Awesome AP - thanks. The Plus has only X on it - no X2, same as the 128K Prototype - all X on the bigger ones, and only Y on the smaller ones. I will find these once I get some time - right now getting units that work out of my collection ready and for sale.
  9. North Hedge Ned

    Help revive an Original Macintosh Prototype

    Awkward - and what about other factors? I went on Mouser.ca here in Canada, and they have a lot to look at. Voltages and all the likes.
  10. North Hedge Ned

    Help revive an Original Macintosh Prototype

    Trash, I would have to check. Since the one unit is working, I really don't want to run the chance of screwing up any good components on it. Actually strongly thinking of putting it on the market (there is a whole different thread I am sure). Don't want to run the chance of 2 bad units. LaPorta, and AwkwardPotato - thanks for the starting points. May be a silly question, but do I have to discharge the CRT before soldering the FB Transformer? That is one tool that I do not have - a CRT discharge tool.
  11. North Hedge Ned

    Help revive an Original Macintosh Prototype

    Interesting, AwkwardPotato... I wonder this though, because last night in testing an odd thing happened to my Mac Plus. Ran the Plus a couple of times ok. Then, the Power was off, AC cord in, and an external SCSI HD 80SC was connected and running. Then I heard a loud sizzling, and then a burnt popcorn smell. When I inspected inside, I found one of these very filter caps you speak of, but it was literally cracked apart, freshly, and the smell was the strongest at that point. I am scared to turn it back on now. I guess the question is - where can I find replacement RIFA line filter caps?
  12. North Hedge Ned

    Help revive an Original Macintosh Prototype

    Even the same circuit at C33 has slight cracking on it too... Not sure what these do.
  13. Hi everyone - this is an off shoot from my previous post entitled "Different Macintosh in Original User Guide?" because it now tries to tackle the issue of getting the second of my two Original Macintosh prototypes working. Here is the issue: Unit powers on, beeps ok, but the video comes up all weird. Upon closer inspection, I see that two items (resistors, converters, something weird) are slightly cracked like dried honey at locations C37 and C38 of the power sweep board. Likely the cause? There are a slew of photos for you all to see - what do you think? See anything else? I have tried ALL available video adjustments to no resolve - voltage, focus, vertical horizontal, even the two other adjustments for brightness and such - nothing. Any help in evaluation would be much appreciated.
  14. North Hedge Ned

    Different Macintosh in Original User Guide?

    Hi everyone - I am going to continue this thread in a new one entitled "Help revive an Original Macintosh Prototype". Reason is, I wish to try and repair the sister machine that I mention here with the video issue.
  15. North Hedge Ned

    Different Macintosh in Original User Guide?

    Cool Trash - great insight. Certainly some unique fish mash of design in these babies. I think I am going to keep one of them, especially if I can get the one with video issues working. Might be a stretch though.
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