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Coco FDC on a Dragon computer

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    Coco FDC on a Dragon computer

    A few people have asked me over the years if I have a floppy disk controller (FDC) for the Tano Dragon 64, because apparently the TRS-80 Coco FDC doesn't work.

    Come some people in the know tell me why it doesn't work and will an Eprom upgrade or other hardware mod make it work?

    I currently have no Dragons to test, but don't want to re-invent the wheel if there is a known way to make a Coco FDC work on a Dragon.

    Thanks in advance,

    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

    #2
    It is indeed doable.
    I have a self modified 26-3022 controller with a switchable dual Rom which works perfectly in both RSDOS mode and DragonDos.

    All Dragon 32 and 64 machines carry the +/- 12V on the cartridge port so the 3022 operates correctly.

    I can email you the Rom image ready to program or i can put together a how to for TRS8bit...
    But it really is just a Rom replacement.

    Comment


      #3
      What kind of mods have you made to the 3022?, only the double sized EPROM?
      Never tried it; but does the 3022 work without -12V?. The Dragon slot connector doesn't provide this voltage (IIRC the Dragon 32 internal PSU doesn't not even generate it).
      Posting a guide would be great tho

      Comment


        #4
        Thanks Corfiot,

        So basically to summarise, the Dragon cartridge slot is electrically compatible with the Coco cart slot, and its just the contents of the Prom/Eprom which makes the difference. Sound like all Coco FDCs will work with the correct Eprom?

        I've ordered me a Tano, so I'll try it out when that arrives.

        Cheers,

        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

        Comment


          #5
          Hi guys

          Yes it is fully cartridge slot compatible.
          The 3022 only uses +12v and +5v so the lack of -12v is not a problem.
          If i get a chance later i will take some photos of my 3022 whuch i use with both TRS80 Coco1,2 and 3 (Muktipak required for 2 and 3 due to missing +12v) and various Dragon 32's with no issues


          TC

          Comment


            #6
            Cool, thanks!

            Comment


              #7
              A true Dragon disk controller is different than a Coco controller. It addresses the disk controller chip differently. But, as long as your software does not try to bypass Disk BASIC and directly address the disk controller (like OS-9 or NitrOS-9), it should work with the disk controller.

              Here is someone who has made a Dragon Compatible controller (It's in Spanish): http://hardware.speccy.org/temp/Dragon-1.html
              -----[ Al ]-----

              3 - TRS-80 Model I, TRS-80 Model 4D, LNW-80 Model I, Coco, 3 - Coco 2, Coco 3, 2 - Tano Dragon 64, C64, C64c, C128, 2 - Atari 800XL,
              Atari 520-ST, Atari Mega-2 ST, Amiga 1000, TS-1000, TS-2068, ZX-Spectrum, IBM 5150, 2 - Apple ][gs, Laser 128, and a butt load of Macs and Intel PCs.

              Comment


                #8
                Yep, I have two of these boards and they work great. They're a clone of the original DragonDOS cart, just a little smaller.

                Easy to build; but tricky to calibrate if you don't have an oscilloscope.

                Comment


                  #9
                  I have a TANO Dragon 64 and an extra disk controller I'd like to modify into a Dragon Controller.

                  Can you send me the ROM image, or point me to where I can download it?
                  -----[ Al ]-----

                  3 - TRS-80 Model I, TRS-80 Model 4D, LNW-80 Model I, Coco, 3 - Coco 2, Coco 3, 2 - Tano Dragon 64, C64, C64c, C128, 2 - Atari 800XL,
                  Atari 520-ST, Atari Mega-2 ST, Amiga 1000, TS-1000, TS-2068, ZX-Spectrum, IBM 5150, 2 - Apple ][gs, Laser 128, and a butt load of Macs and Intel PCs.

                  Comment


                    #10
                    You can get them from my site:

                    DragonDOS on it's own (8Kb) http://ianmav.customer.netspace.net....ads/dratrs.rom

                    or

                    DragonDOS and RS-DOS (16Kb) http://ianmav.customer.netspace.net....dualfdc16k.rom

                    (You need to add a switch to change between DOSes when using the 2nd file.)

                    Cheers,

                    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

                    Comment


                      #11
                      Originally posted by TRS-Ian View Post
                      You can get them from my site:

                      DragonDOS on it's own (8Kb) http://ianmav.customer.netspace.net....ads/dratrs.rom

                      or

                      DragonDOS and RS-DOS (16Kb) http://ianmav.customer.netspace.net....dualfdc16k.rom

                      (You need to add a switch to change between DOSes when using the 2nd file.)

                      Cheers,

                      Ian.
                      Any instructions on how to add the switch?

                      What kind of EPROM would I use for 16k?


                      Added: Thanks Ian!
                      -----[ Al ]-----

                      3 - TRS-80 Model I, TRS-80 Model 4D, LNW-80 Model I, Coco, 3 - Coco 2, Coco 3, 2 - Tano Dragon 64, C64, C64c, C128, 2 - Atari 800XL,
                      Atari 520-ST, Atari Mega-2 ST, Amiga 1000, TS-1000, TS-2068, ZX-Spectrum, IBM 5150, 2 - Apple ][gs, Laser 128, and a butt load of Macs and Intel PCs.

                      Comment


                        #12
                        I'll do one and let you know. The Corfiot explained how to do it. From memory it's like any 24-pin to 28-pin eprom upgrade: the 4 extra pins need to be wired somewhere else on the PCB, and one line (A13?) goes to a switch where High selects the top 8K and Low selects the bottom 8K...

                        Hope this helps,

                        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

                        Comment


                          #13
                          Hi guys.

                          The firmware Ian has on his site are the ones i sent him and are proved to work.
                          i dont have time today but will take my cart apart tomorrow and publish some pictures...and instructions.

                          It's an easy mod with no board mods or hookup wires if i remember.

                          Comment


                            #14
                            I wonder where I could get one of those boards from that the Spanish guy had made? He must have spares...

                            Comment


                              #15
                              I did this earlier this year.. some pics:

                              https://www.facebook.com/icbrkr/medi...0907465&type=3


                              I luckily had a 2564 ROM lying around from another project.

                              The Retro store (http://store.go4retro.com/2364-adapter/) has adapters for 28 ->24 for a pretty reasonable price.

                              Comment

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