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Type: Posts; User: LaserVision

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  1. Hi Gaza, Would you mind sharing the design...

    Hi Gaza,

    Would you mind sharing the design files for the boards you made? I would like to make some boards and use it with my custom 4K Monitor ROM for the Model II. (BigTMon).

    Regards
  2. The above is correct for the model 1, III/4. For...

    The above is correct for the model 1, III/4.
    For a Model II, 12, etc it is a bit more complicated to program the SIO, but then polling Serial Port A or B is similar.

    Regards,
    LaserVision
  3. Yes, You could change the number of columns...

    Yes, You could change the number of columns and/or rows visible on the screen.
    It would require setting different values to the 6845 which is the CRT controller used.
    This is already done when...
  4. TRS-80 Model I/III graphics on my Model II.

    Hi,

    By using a different character generator (and one extra wire) on the Model II, the machine is capable of TRS-80 Model I/III graphics.
    55851
    Resolution is 160 x 72 pixels, or 160 x 75 when...
  5. Thanks. Calculated them myself (only vertical...

    Thanks.
    Calculated them myself (only vertical settings changed), tested it on the emulator and did final tuning on a real machine. As you might have noted, the character space is now 9 height x 8...
  6. New BigTMon version able to showi 25 lines of 80...

    New BigTMon version able to showi 25 lines of 80 characters on the Model II. This is without any hardware change.
    54974
  7. Hi Guys, I took the suggestion of loading...

    Hi Guys,

    I took the suggestion of loading bytes to the Model II and implemented it (together with dumping data from the Model II).
    This is done through the RS-232 link.
    Attached pictures show...
  8. Hi guys, Good to hear there is some interest....

    Hi guys,

    Good to hear there is some interest.
    Would you opt for a bare board plus programmed GAL (for decoding) and assemble the board yourself based on the provided schematic?
    Or would you...
  9. Pete, Unplugging the CRT analog board is an...

    Pete,
    Unplugging the CRT analog board is an excellent suggestion.
    I would indeed feel much better with the CRT without power when performing tests.

    LaserVision
  10. A new try for the pictures5346053461

    A new try for the pictures5346053461
  11. Custom 4K ROM for Big Tandy computers like the Model II

    Hi,

    As I am working on the 512K RAM board for the model II I also needed a way to test it.

    For that reason I did build a 4K ROM board that connects to the original ROM socket using a flat...
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    Looking for TRS-80 Model 12 keyboard

    Hi,

    I just acquired a TRS-80 Model 12 from Germany. The machine is missing 2 parts:
    - The back cover for the cage
    - The keyboard
    The machine will work without the cover, but a keyboard is more...
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    My "new" Model 12

    Hi Pete,

    I just acquired a Model 12 from Germany. The unit has type number 26-4004 and serial number 0000638. History unknown.
    Unfortunately the keyboard is missing and the case has some minor...
  14. Hi AN7000_Dude, You might want to Google on...

    Hi AN7000_Dude,

    You might want to Google on Arduino and MT8808. You'll an interesting link for a C64 keyboard emulator (http://podstawczynski.com/c64/key64tapper/)
    The MT8808 is an 8 x 8 Analog...
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    Pete, looks like a 512K board is going to create...

    Pete, looks like a 512K board is going to create a lot of room in your cage.
    And without any jumpers.
    However, you will need to disable the 16K memory of the HD controller board (when present) as...
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    Gentlemen, Thanks for the response. JonB,...

    Gentlemen,

    Thanks for the response.
    JonB, all the signals I need are Z80 lines, plus the select*. So the shim was an excellent idea!
    But also hans-04, as suggested by lowen, would solve my...
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    Building a Model 2 512K RAM board

    Hi Guys,

    I recently acquired a model 2. Going through the technical documentation it states that 512K of RAM is supported by design.
    With the board designed by Tandy that would not work as a...
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