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pinto_guy

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    Palo Alo, CA

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  1. Thanks. The flyback crossed my mind, but I did have a pretty strong spark when I discharged the HV connecter to the CRT. Also, I do have a strong single point in the center of the screen after I disconnect J1. Anyhow, I'll start the detective work soon. It's most likely a problem in the vertical raster circuit. Yes, the twin floppy is handy. Turns out that the 128k LB has capability for two FDDs 9internal and external). The was Colby did it was to daisy chain both with one ribbon cable, and simply connect the FDD2 enable signal from the pin 17 of the external FDD connector to the s
  2. pinto_guy

    Walkmac

    I now have some credible information that he passed away in September 2018
  3. pinto_guy

    Walkmac

    Nobody is quite sure when he passed away, but we estimate it was about 2 years ago. Actually this week-end, we held a huge estate sale and disposed of all the remaining stuff from the 400 boxes that he left behind.
  4. My current project from the Colby estate is to revive a MacColby (1st pic). When I first turned it on, I actually got a loud bong, and the usual floppy question mark, so I was elated (2nd pic). It took me a while to de-stuck the two floppy drives, and I could get everything going in record time. Alas, just as I put everything back together, two new problems popped up. One was an easy fix (one FDD stopped ejecting), but the other one puzzles me: the screen all the sudden turned black. Not the J1-solder joint-problem black, but more like a fuzzy bright zone at the top of the screen (3rd pic). Be
  5. pinto_guy

    Walkmac

    If anyone interested, it's now on eBay https://www.ebay.com/itm/193747790896
  6. pinto_guy

    Walkmac

    And here are the two cousins after restoration. We'll put one up for auction on eBay soon.
  7. pinto_guy

    Walkmac

    No, same size. Probably an optical effect
  8. pinto_guy

    Walkmac

    Gents: I was able to fix all three of the 2nd generation Mac Plus Walkmacs that we had (see photo of the three brothers below). I sold one privately, and keeping one for myself. We have just listed the third one on eBay here FYI
  9. pinto_guy

    Walkmac

    One of my friend in crime found this old Infoworld article. So it does appear that this model was destined to be commercialized.
  10. pinto_guy

    Walkmac

    Here is another system that I worked on in the last few days. It looks like perhaps a prototype to the commercial Walkmac. It is also based on a Plus, and features what looks like to same plasma display, although this screen is powered directly from the computing unit. It features similar removable FDD and HDD cartridges on the side. The HDD is a very compact Conner CP-340. They added an Adaptec adapter card for a reason that escapes me, since the 340 is supposed to have the SCSI interface. I could get everything going, except this modular HDD. The Adaptec card actually seems to draw a lot of
  11. pinto_guy

    Walkmac

    Sorry I put the wrong video link on my previous post, and I can't edit any longer. The right youtube video is here
  12. pinto_guy

    Walkmac

    Thanks macdoogie. Anything you can find on the "mystery signal" topic would be great. By the way, I am in the process of refurbishing 2 (perhaps 3) more Walkmacs of this type, that we will be putting up for sale. Not sure at what price and under what format (Private sales, eBay, CL... ?). If anyone in this forum is interested, please PM me. Also, in the collection of floppies, we found an HyperCard file promoting the Walkmac SE, successor to this Walkmac. We put a screen shot of navigating the demo in this youtube video. It's precious
  13. Thanks macdoogie. Yes, the orange plasma screen looks awesome. By the way, I am in the process of refurbishing 2 (perhaps 3) more Walkmacs of this type, that we will be putting up for sale. Not sure at what price and under what format (Private sales, eBay, CL... ?). If anyone in this forum is interested, please PM me. Also, in the collection of floppies, we found an HyperCard file promoting the Walkmac SE, successor to this Walkmac. We put a screen shot of navigating the demo in this youtube video. It's precious Edit: I realize that I posted in the wrong fo
  14. Update: I was able to salvage the 40MB drive, using Silverlining 5.6.1. When I chose the drive after it recognized it, I got an message saying the volume info was bad, and asking me to revert. The revert worked ! But I could not rescue the 1.7GB drive and I had to reinitialize. Fortunately, I had a backup
  15. So I had two perfectly good HDD's in two different external enclosures. One was big (1.7 GB), and the other one that I just revived from the "Sticky Actuator" syndrome, a 40MB Quantum Prodrive. I wanted to copy the content from the 40MB into the 1.7GB. So I daisy chained both of them to my SE, not realizing that they both had the same SCSI address. This usually leads to a system hanging at some point, which it did. After turning everything off, I changed the SCSI address of the 40MB and rebooted. Unfortunately, neither drives can now mount. The 40MB says "Uninitialized", and the 1.7GB strange
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