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  • Posts

    • Interesting concept, I like it!  Sounds like 90% of that is heavy lifting from a software prospective.  That is something neither my engineer nor I have the skill set for.  However, if anyone is interested in joining the project...  Let me know
    • It’s the original belt.   The battery wasn’t in it, thank god. No popped caps, no battery leakage.    The Twiggy Mac, along with its keyboard and mouse had been in its original padded carry bag at least since the original owner died in the 1990s. The original owner was a member of Apple’s board of directors at one point in time and when he died, his daughter ended up with it. I’m her computer tech and she called me over one day to go through “a bunch of old equipment” to identify what to donate and what to throw away, and this old equipment included the Twiggy Mac.   Neither of us knew what it was, but I knew no production Mac had ever been released with a 5.25” floppy drive and that it was probably a prototype of some kind. She wanted it to go to a good home when I told her it was likely a semi-rare or rare Mac, so she gave it to me in mid-December. I did some research and realized it was a Twiggy Mac and that finding it was, as I put it at the time, “like finding an albino Bigfoot.” (Yes, I’ve kept quiet about it for nearly 6 months. It’s been hard to do. I mean, imagine finding an Albino Bigfoot - Who wouldn’t want to let the world know about it?)   When I got it, the floppy was inserted incorrectly. It was face-up, but it was rotated 90° from proper orientation (see the video). I couldn’t remove the floppy; it was wedged in pretty good, so I left it in the drive and only removed it after I pulled the Twiggy drive and its frame out of the case.    The FileWare floppy - a literal one-of-a-kind item due to the OS on the disk being written for the specific ROM revision on the board - may be damaged.   The Twiggy Mac starts but does not load the OS. I’m pretty sure the Twiggy drive is working as designed (for what that’s worth ) but I can’t tell. Due to the utter uniqueness of the hardware, Im thinking I can’t just pop in a FileWare disk for a Lisa and expect it to be read (although I haven’t tried).   If anyone wants to lend a hand with backing up the FileWare floppy and/or troubleshooting the Twiggy drive, I would be eternally grateful. I know this is a special Mac, one of only 3 of its kind known to exist. I’d love to get it working again.   And I’m glad people are digging the fact that it exists and that it’s not a hoax. If anyone is skeptical - I get it. I’m a skeptic by nature and I could scarcely believe it myself at first and didn’t believe it was an actual example of the near-mythic Twiggy Mac until I saw Mac Man on the logic board.   So that’s the (recent) history of my Twiggy Mac.   Thanks for reading and for the interest in my Albino Bigfoot.   OldMacGuy   And now…   This is a Public Service Announcement (unfortunately without guitar): IMG_6276.MOV
    • Oooooo I have dreamed about somewhat of a similar concept for many years, but nothing that ever came to fruition. But looks like your working on it in a way.    So, why not take it a step further... Use the ARM as a co-processor to the Mac. It could crunch the javascript heavy rendering engine of a web browser. While the "chrome" runs on the System 6/7 Side. this would give the authentic look and feel of the browser running under the MacOS, but be able to handle a modern website. Especially if the ARM is also part of the video card circuitry, it can "frame up" the output of the rendering engine to be within the window of the chrome, making it seemless. Or, even playing youtube videos. since the video playback would be written into the framebuffer with the underlying linux kernel.    Getting carried away, I know. But hey. 
    • ouch. yea theres some issues going on there. the transistor is being overloaded potentially. Also, check the damper diode and make sure it isnt leaky or shorted. 
    • The Cortex A9 will be on all variants as it is included on a SoM that already has the FPGA system built-in.  That said in the base configuration it wouldn't be used as it wouldn't include ADB loop-back and such, thus it would be cheaper.  The problem is that the FPGA solution requires many I/O for the PDS.  There is a pre-packaged board that will be attached to our PCB to use Xilinx XC7Z020 which has enough capability.  This has 106 user I/Os which is what we need, also DAC is involved on the board.  My goal is to have a Grayscale only card be around $350 and the Linux compatibility version be around $395.  The benefit of a SoM is that future additions of Ethernet, USB, etc simply require FPGA update and Mac OS driver functionality.  Since the final project will be be open source enough it will allow others to make the software side of things work. 
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