Image Map Image Map
Page 8 of 9 FirstFirst ... 456789 LastLast
Results 71 to 80 of 81

Thread: TRS-80 diagnostic/ICE card

  1. #71
    Join Date
    Sep 2016
    Location
    Melbourne, Australia
    Posts
    562

    Default

    Quote Originally Posted by fjkraan View Post
    Isn't this because Radio Shack numbered the expansion bus card edge wrong? I remember some interesting debugging some 30 years ago when I made a custom cable to my non-standard floppy disk interface.

    Greetings,

    Fred Jan
    I was aware of the expansion numbering and the shield takes that into account. The problem is in the cpu socket cable, using a standard 2x20 header to another 2x20 header with a simple pcb fitted with pins for the socket its all good with no swapping.
    The odd side of the DIP plug crimps to the even wires and the even side to the odd wires.

    adapter-pcb-back.jpg

  2. #72

    Default

    My board arrived - thanks much!

    Do you happen to have a list for the other parts required? I'm not very good at part manufacturer website spelunking, I will confess.

    -Kevin

  3. #73
    Join Date
    Sep 2016
    Location
    Melbourne, Australia
    Posts
    562

    Default

    Quote Originally Posted by troj View Post
    My board arrived - thanks much!

    Do you happen to have a list for the other parts required? I'm not very good at part manufacturer website spelunking, I will confess.

    -Kevin
    Yes, its here as a separate file and also in the arduino software zip files.
    https://drive.google.com/open?id=1ny...-n8aDJ5hB-LfY5

  4. #74

    Default

    Quote Originally Posted by David_M View Post
    Yes, its here as a separate file and also in the arduino software zip files.
    https://drive.google.com/open?id=1ny...-n8aDJ5hB-LfY5
    Awesome, thank you!

    -Kevin

  5. #75
    Join Date
    Sep 2016
    Location
    Melbourne, Australia
    Posts
    562

    Default

    I've uploaded a new version of the Arduino code

    A little bit of code cleanup and some bugs fixed.

    https://drive.google.com/open?id=1ny...-n8aDJ5hB-LfY5

  6. #76

    Default

    David...

    Looking at the BOM in your documentation, you have this part listed: https://www.digikey.com/product-deta...P40S-ND/924326

    The problem is that it's backordered with a lead time of 20 weeks - sometime in December.

    I'm far from an electronics expert - I know what various parts do, I have some moderate soldering skills. But making sure I have a suitable substitute identified is beyond me. Thus, I was wondering if you could let me know if this part (https://www.digikey.com/product-deta...40S-ND/1122542) is a suitable replacement? If not, do you know a Digi-Key part that is?

    Thanks much!

    -Kevin

  7. #77
    Join Date
    Apr 2015
    Location
    Morisset, NSW Australia
    Posts
    227

    Default

    Quote Originally Posted by troj View Post
    David...

    Looking at the BOM in your documentation, you have this part listed: https://www.digikey.com/product-deta...P40S-ND/924326

    The problem is that it's backordered with a lead time of 20 weeks - sometime in December.

    -Kevin
    Wow, there must have been a run on them . . . I ordered 3 about a week and a half ago and they arrived on Thurs. I wonder what could have caused them to sell out?

  8. #78
    Join Date
    Sep 2016
    Location
    Melbourne, Australia
    Posts
    562

    Default

    Try this link to alternatives

    https://www.digikey.com/products/en/...=1&pageSize=25

    Looking closely at the image of the one at top it appears it has the odd/even swap issue I found with the ones I got off ebay.
    For those that have ordered the dip header and have the swapping issue, please let me know.
    If you haven't as yet ordered the dip plug, I can send you an adapter boards with pins that will avoid the use of the dip plug.

    adapter-pcb-back.jpg

    Let me know if you have any issues and I can solve the problem for you.


    Quote Originally Posted by troj View Post
    David...

    Looking at the BOM in your documentation, you have this part listed: https://www.digikey.com/product-deta...P40S-ND/924326

    The problem is that it's backordered with a lead time of 20 weeks - sometime in December.

    I'm far from an electronics expert - I know what various parts do, I have some moderate soldering skills. But making sure I have a suitable substitute identified is beyond me. Thus, I was wondering if you could let me know if this part (https://www.digikey.com/product-deta...40S-ND/1122542) is a suitable replacement? If not, do you know a Digi-Key part that is?

    Thanks much!

    -Kevin
    Last edited by David_M; August 16th, 2018 at 04:11 AM.

  9. #79

    Default

    Quote Originally Posted by David_M View Post
    Try this link to alternatives
    Thanks for the PCB, arrived today. Ordered all the parts, and thanks for the alternative for the DIP header.

    Steve

  10. #80

    Default

    David,
    I received my PCB and Pins today in the Mail.

    THANKS, now I just need to get it all assembled.

    Larry

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
  •