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Modify a GOTEK floppy emulator

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    #16
    Originally posted by Chuck(G) View Post
    Careful, Hans! The HxC will not replace SCSI nor IDE/ATA floppy drives! There are also 8" drives that do not use the Shugart standard interface.
    Thank you Chuck(G) for this remark, you are totally right.
    But of course I mean all Floppy diskdrives.

    @MikeS If your floppy interface use a different cable (fewer wires), you have to build an interface cable between the USB- or SD-HxC adapter to connect to
    your floppy diskdrive. (34 to 26 pins)

    To complete my answer, our Australian friends has started a project to use the HxC emulator as a replacement for a hard disk.
    It could use the images made for the FreHD interface and works on the Model 3, 4 and 4p. I used the latest available drivers to give it a try.
    The interface works well and could replace a harddisk.
    As there are some technical problems to solve and a lack of interesting from the Trs 80 community the project has stopped as far as I know.

    Comment


      #17
      Originally posted by Chuck(G) View Post
      I have no idea--it would seem to me that the 1.44MB version would work also as a 1.2M drive--you simply don't address sectors 16-18 on each track. The data rate's the same. The perceived RPM would, of course, be 300 RPM and not 360. But it should work for most applications.

      Unless, of course, they're talking about the 1.23M NEC PC-98 drives, which use 1024 byte sectors.
      Actually, I was thinking of using it as an 8" drive replacement so the RPM does matter.

      Comment


        #18
        Originally posted by Hans01 View Post
        Thank you Chuck(G) for this remark, you are totally right.
        But of course I mean all Floppy diskdrives.

        @MikeS If your floppy interface use a different cable (fewer wires), you have to build an interface cable between the USB- or SD-HxC adapter to connect to
        your floppy diskdrive. (34 to 26 pins)
        Well, Chuck and I were just teasing you a bit about all floppy drives; there are SCSI and ATA floppy drives (although admittedly not very common) that the HxC would not be able to handle.
        https://www.cnet.com/products/teac-f...e-scsi-series/

        To complete my answer, our Australian friends has started a project to use the HxC emulator as a replacement for a hard disk.
        Sounds very interesting...
        Last edited by MikeS; July 12, 2017, 11:57 AM.

        Comment


          #19
          Or for that matter, a Memorex 650, a NEC 8" with integrated PLL, some early IBM 8" drives or a few that required 3-phase stepping...
          Reach me: vcfblackhole _at_ protonmail dot com.

          Comment


            #20
            Originally posted by MikeS View Post
            ... nor 26-pin drives, alas

            But I was really asking about the cheap Gotek unit; they mention a 1.2HD "upgrade" - what's that about?
            Have you missed this ? :

            http://torlus.com/floppy/forum/viewforum.php?f=33

            https://www.youtube.com/watch?v=Q2qVgBJUI5U

            Comment


              #21
              Originally posted by Hans01 View Post
              Thank you Chuck(G) for this remark, you are totally right.
              But of course I mean all Floppy diskdrives.

              @MikeS If your floppy interface use a different cable (fewer wires), you have to build an interface cable between the USB- or SD-HxC adapter to connect to
              your floppy diskdrive. (34 to 26 pins)

              To complete my answer, our Australian friends has started a project to use the HxC emulator as a replacement for a hard disk.
              It could use the images made for the FreHD interface and works on the Model 3, 4 and 4p. I used the latest available drivers to give it a try.
              The interface works well and could replace a harddisk.
              As there are some technical problems to solve and a lack of interesting from the Trs 80 community the project has stopped as far as I know.

              This is already done, but not by an Australian :

              https://groups.yahoo.com/neo/groups/...ARDx_0.0b2.ZIP
              http://torlus.com/floppy/forum/viewt...hp?f=19&t=1858

              Comment


                #22
                Hi,
                Greetings,
                may i ask you the wiring for the third switch ,sir

                Comment


                  #23
                  I'm going to need to try this out. I have had great luck using the Gotek with other XT class PC machines, especially in emulating a 99 track floppy which results in tons more space, even when running in double density mode. (99 tracks, 9 sectors per track, double sided.)

                  Originally posted by shirsch View Post
                  Are you saying that the Gotek / HxC can emulate two drives at the same time, or do you mean it can be either one of 0 and 1? The documentation on the hxc2001 web site mentions that the Gotek can emulate only a single drive (unlike the Lotharek units).
                  It really isn't clear but as others have pointed out, the Gotek running HxC firmware can't. You have to set a jump on it. Luckily buying two is cheap enough

                  If I ever get my floppy only no-floppy drive Model 3 working, I will likely internally mount a Gotek and connect it to the Aerocomp disk controller board I found so I can turn the machine into something usable. Now.... if only I can fix the garbage on screen issue...
                  -- Adrian Black / Adrian's Digital Basement

                  Comment


                    #24
                    @nitin

                    How to add the third button and a buzzer to a Gotek http://torlus.com/floppy/forum/viewt...p=11486#p16461
                    Thanks to Jeff.

                    Comment


                      #25
                      Originally posted by MikeS View Post
                      Looks like as far as replacing a PC drive is concerned it's almost always a 3.5HD drive; does anybody have experience replacing a 1.2M 5.25HD drive in a PC?

                      TIA, m
                      Yep. Works great in a 3.5" to 5.25" bay converter. I've even made DSDD 2.5MB custom disks as well as 3.5" 720kb & 5.25" 360kb disk images.
                      If my Tandy 1000 EX supported DSHD disks, I'd be able to mix and match those too.

                      PS, I added an OLED display to mine too.

                      My Retro Collection:
                      CBM: C64, Amiga 500 x2, 600 & 1200
                      Apple's: IIc, Mac SE, LCII, LC630 & Power Mac G3/233 Desktop
                      PC's: K6-III+ 500 System + Roland MT-32 & Tandy 1000 EX 640kb, 3.5" FDD, CF-IDE 4GB HDD
                      Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc

                      Comment


                        #26
                        For a model 1 to a gotek, what cable do i need? I cannot find any discussion on what cable would be needed for a model 1/EI to a gotek.

                        I have been playing with a gotek on a 486 and it works well. The TRS-80 expansion intercase edge connector is not 'notched' like my floppy/IDE cables, so i'd guess it is not as simple as modifying a PC floppy cable (remove the notch in the connector) so it will fit the EI.

                        Comment


                          #27
                          Originally posted by Dokken View Post
                          For a model 1 to a gotek, what cable do i need? I cannot find any discussion on what cable would be needed for a model 1/EI to a gotek.

                          I have been playing with a gotek on a 486 and it works well. The TRS-80 expansion intercase edge connector is not 'notched' like my floppy/IDE cables, so i'd guess it is not as simple as modifying a PC floppy cable (remove the notch in the connector) so it will fit the EI.
                          Which firmware are you using?
                          My Retro Collection:
                          CBM: C64, Amiga 500 x2, 600 & 1200
                          Apple's: IIc, Mac SE, LCII, LC630 & Power Mac G3/233 Desktop
                          PC's: K6-III+ 500 System + Roland MT-32 & Tandy 1000 EX 640kb, 3.5" FDD, CF-IDE 4GB HDD
                          Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc

                          Comment


                            #28
                            Dokken,
                            If you have a TRS-80 Model 1, then you have Card Edge connectors on the cable at the Floppy drives. You can either add
                            a 34 Pin connector or use an adapter like this.


                            P1030300.jpg

                            Thanks.

                            Larry

                            Comment


                              #29
                              It is not all that hard to put a IDC type connector on. You do need something to crimp it on with. A bench vise works well. It does seem to take 3 hands.
                              I've found a trick that helps. I push the back piece down on the cable and then put a small drop of supper glue between the cable and the back piece. This will keep the ribbon cable from sliding out or twisting while putting it in the vise.
                              Make sure you dress the cable out from the drive the way you want it first and that the band is on the right end of the connector. If you are using a PC cable, check to see if it has a twist in the middle. If it is in the part you are using, it will need changing of the select jumpers. If that is inconvenient, you can separate the swapped section and swap it back at your connector. Using the super glue method helps keep the 3 pieces of ribbon cable in place while crimping.
                              Always get two needles and do an end to end check as well as an adjacent wire check, with an ohm meter.
                              Dwight

                              Comment


                                #30
                                Originally posted by ldkraemer View Post
                                Dokken,
                                If you have a TRS-80 Model 1, then you have Card Edge connectors on the cable at the Floppy drives. You can either add
                                a 34 Pin connector or use an adapter like this.
                                [ATTACH=CONFIG]51083[/ATTACH]

                                Larry
                                Thank you Larry and Dwight.

                                For clarification, this connection goes into a PC floppy cable with the twist at the end for the primary drive? I'm surprised the TRS-80 is pin-for-pin compatible/mapped to the gotek floppy.

                                I've ordered a second gotek and the TTL USB cable. I'll work on a cable from the EI to the gotek.

                                Comment

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