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  1. #1
    Join Date
    Feb 2014
    Location
    Netherlands
    Posts
    399

    Default Model 12 BUS BOARD

    I have a Model 12 without a busboard for more than a year now.
    I never succeeded in finding a card cage and bus board for this computer.
    At last I decided to build one myself.

    At first I found someone who sells the bus connectors as a start.
    There was no schematic available of the board, but with studying
    the Model II and Model 6000 schematics I found all I need for this job.

    Asking Pascal to draw the gerbers, he was in for help and is drawing them now.

    The project exists of a PCB with 3 bus slots and two flatcables with 40 wires each
    to connect to the motherboard. The termination of the lines is done.

    Here is a picture how it is going to look.

    BUS-M12.jpg
    The flatcables connects to K5 and K6 are to solder on the busconnector on the backside of the motherboard.
    In this mode K1, K2, K3 follow the connector on the motherboard, the video card stays on his place.

    There will be a second option, see this picture.
    option.jpg
    The leftside is the same as above, but the rightside has two connectors for the flatcables and a 80 bus edge connector,
    just like the one on the hans-02.

    You can mount the leftside anywhere you like and the connector on the rightside in the busconnector on the motherboard.
    The motherboard connector is now copied to C1. The videocard is inserted in C1 now.
    No need to solder on the motherboard.

    How far is the project.

    The gerbers for the leftside are nearly ready and can be tested.
    The rightside must be drawn (but is a stripped hans-02).

    If you are intrested in this project, please let me know.
    If you have any suggestions, please do.
    Last edited by Hans01; October 21st, 2015 at 11:14 PM.

  2. #2

    Default

    @Han01 keeps on producing awesome hacks! Nice work!

    I too have pondered this idea as the Model 12 without a card cage is a neutered beast.

    One strong suggestion is to add more bus connectors. With only 3 slots available and with 1 taken by the video card, you can't have 68000 OS (e.g. Xenix) with a HD.

  3. #3
    Join Date
    Sep 2011
    Location
    Melbourne, Australia
    Posts
    911

    Default

    I like it. With the extra bus connector you can add a Model II HRG board and that is all I'd need because I don't use the 68000 functionality of my 8in TRS-80s

    Ian.
    *There is never a charge for Tech Support even if you don't purchase from me - We are Enthusiasts Helping Other Enthusiast and that is just the way it is

  4. #4
    Join Date
    Feb 2014
    Location
    Netherlands
    Posts
    399

    Default

    @Ian and @pski

    I have limited the number of slots for two reasons.
    My first plan was to use it for the hans-02. The second was the costs of the PCB, which increase dramaticly above a certain size.
    I'll ask Pascal if it is possible to increase the number of slots.

    Ian, in that case you MUST move the video board to the bus. It is not tested but it seems possible to me.

  5. #5
    Join Date
    Sep 2011
    Location
    Melbourne, Australia
    Posts
    911

    Default

    So are there two 40pin busses on the M12 motherboard which the Hans-03 connects to? That gives a total of 4 slots (including the one on the M12 motherboard).

    You could theoretically add two long(ish) IDE cables and sit the Hans-03 outside of the case at the back or on top of the Model 12...

    Ian.
    *There is never a charge for Tech Support even if you don't purchase from me - We are Enthusiasts Helping Other Enthusiast and that is just the way it is

  6. #6

    Default

    Quote Originally Posted by TRS-Ian View Post
    So are there two 40pin busses on the M12 motherboard which the Hans-03 connects to? That gives a total of 4 slots (including the one on the M12 motherboard).
    Ian.
    I think what Hans is proposing in option 1 is that you solder the (2) 40pin cables to the backside of the 80 pin slot on the main logic board. Option 2 is much more preferable as you don't need to modify (or remove) the main board. Hans please correct me if I am mistaken.

    You could theoretically add two long(ish) IDE cables and sit the Hans-03 outside of the case at the back or on top of the Model 12...
    There is so much empty space in the M12 that I'd have to find a way of keeping the cards in the case.

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