Image Map Image Map

View Poll Results: What would people like to see for the Talker/80 project?

Voters
13. You may not vote on this poll
  • Add speaker + amplifier to board - for cassette output sound + speak

    9 69.23%
  • Add more features - for example, PCM sound, Real Time Clock, ...

    4 30.77%
  • Make it a cartridge that plugs into a back plane extender board

    2 15.38%
  • Make it compatible with the Model 3 / Model 4

    12 92.31%
  • Make a case / enclosure for it (3D printed)

    6 46.15%
Multiple Choice Poll.
Page 8 of 8 FirstFirst ... 45678
Results 71 to 77 of 77

Thread: Talker/80 - New Voice Synthesizer in the Making

  1. #71

    Default

    We DIY hardware hackers love the old GALs - Talker/80 uses 2 of them for address decoding and databus latch / tristate buffer.

    Now, to all DIY Talker/80 builders - beware of FAKE COUNTERFEIT GALS on eBay from China! I just got a bunch of GAL22V10B's for cheap - and they are fake. Both my programmers fail to verify, even though all other stages (blank, erase, program) go through.

    Even visually it is pretty clear that they are fake... just look at them. The first / top one in the picture is real - GAL22V10D. A real GAL22V10B looks similar. And then, below are the fake ones. Even that Lattice Logo looks fake.

    So, careful when you get them from eBay! There are more and more fake chips. I had that before. Fake SP0256AL2s....


    IMG_20200917_200244 (Small).jpg
    IMG_20200917_200250 (Small).jpg
    Last edited by LambdaMikel; September 17th, 2020 at 07:54 PM.

  2. #72

    Default

    Another note on programming GALs: the best software for generating the JEDEC programming files, ispLEVER Classic from Lattice, was free for many years. Starting this year it's about $600 for a one-year license. No new version, just a new fee. What a dirty trick.

    ispLEVER Classic includes real logic synthesis. The main alternative, WinCUPL, is far more primitive, and it's not useful for Lattice devices except GALs.

    Anyone want a lot of ispLSI CPLDs for cheap?

  3. #73

    Default

    Uhh, bummer! Understandable that you are getting rid of them.

    I am still using WinCUPL for the old GALs - I don't think they will try to get cash for a 20 year old program
    At least that's my hope...

    Btw, @JoeZwerko, do you have an explanation how it is so easy for counterfeit chips to fool programmers into "OK"? (Only verify fails) Is that just a line / signal being pulled low (constantly)?

  4. #74

    Default

    The ispLSI are great chips, but of limited usefulness now since they only support 5 volts.

    A good question would be whether the GALs are being correctly programmed or not. Maybe put one on a breadboard and see if it does the desired function.

    I use a completely different programming device that what your photo shows... can you read the fuses into a buffer and see whether it resembles what is expected? I built a GAL programmer years ago, and the "read"/"verify" process was pretty straightforward.

    I guess the answer is "no"... I have no explanation.

    I'm not anxious to find out whether WinCUPL supports some of the more unusual GAL devices I have, like the 20RA10 and the 6002B.

  5. #75

    Default

    Quote Originally Posted by Joe Zwerko View Post
    The ispLSI are great chips, but of limited usefulness now since they only support 5 volts.

    A good question would be whether the GALs are being correctly programmed or not. Maybe put one on a breadboard and see if it does the desired function
    Yes, I could do that and put one into Talker/80, but I am already certain that it will fail. I did read out the programmed GAL into a file, compared it to the original, and it was all garbage.

    EDIT: Did that. Programmed U1 as the address decoder for Talker/80 Model 1, powered it up. Random characters, no boot. Shut it down quickly (don't want to short out the expansion port...) So, doesn't work. Clearly as fake as it gets.
    Last edited by LambdaMikel; September 18th, 2020 at 01:02 PM.

  6. #76

    Default

    Here is another good one - "AN EXCLUSIVE RADIO SHACK SERVICE"

    https://www.ebay.com/itm/GI-SP0256A-...IAAOSwm0JYDX2X

    That cries fake to me as well.

    If you are looking into loosing money big time, you can also get one here I guess; highly suspicious of these.

    https://www.ebay.com/itm/SP0256A-AL2...4AAOSwo-5eJXIp

    I bought a couple of SP0256AL2 speech synth chips over the years, and all the new and shiny looking ones (and the Microchip ones) were fake.

    This one is legit:

    https://www.ebay.com/itm/VINTAGE-GI-...8AAOSw4wZeAPN5

  7. #77

    Default

    Missed #SepTandy by one day - but anyhow, here it is

    https://youtu.be/yHVgSqcxh_4

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •