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XT-FDC project level of interest

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    #31
    Originally posted by Crypticalcode0 View Post
    this might be a odd request but could we extend the ROM socket two pins and add two jumps to allow for bigger ROM's?
    What on earth are you going to put in that ROM? Floppy BIOS code isn't that big--it could probably fit comfortably in a 2708. I think Andrew's designing for a 2864 EEPROM anyway.
    Reach me: vcfblackhole _at_ protonmail dot com.

    Comment


      #32
      I'm also interested, please count me in.
      CP/M-86 Software Repository www.cpm86.eolith.co.uk

      Comment


        #33
        I'm also interested. Thanks.

        Comment


          #34
          I would definetly want this board, maybe 2 or 3 of them if the price was right. As for his extending the socket 2 pins, couldn't you have an option to put the xt-ide and the xt-fd bioses into one chip? Also, would these be assembled boards? or just pcb? or pcb and parts that need to be assembled to the board? If's it's bare board, i'm off the list, i'd rather have a kit or a assembled board.

          Originally posted by Chuck(G) View Post
          What on earth are you going to put in that ROM? Floppy BIOS code isn't that big--it could probably fit comfortably in a 2708. I think Andrew's designing for a 2864 EEPROM anyway.
          Nothing beats the roar of a 36yr old drive coming to life after a decade in storagg

          Comment


            #35
            Originally posted by k2x4b524[ View Post
            I would definetly want this board, maybe 2 or 3 of them if the price was right. As for his extending the socket 2 pins, couldn't you have an option to put the xt-ide and the xt-fd bioses into one chip? Also, would these be assembled boards? or just pcb? or pcb and parts that need to be assembled to the board? If's it's bare board, i'm off the list, i'd rather have a kit or a assembled board.
            Hi
            The XT-FDC would be offered similar to how the XT-IDE V2 is now. You can get the PCB then build and test yourself. Maybe someone will organize a group parts buy and/or make kits, partially or fully assembled boards but I can assure you it won't be me.

            Thanks and have a nice day!

            Andrew Lynch

            PS, Chuck I wrote up a custom part DP8473V (PLCC-52) and added it to the schematic. Both FDCs are on the board now and we can decide on one the other or both later. They use very similar pins so it is an easy tweak. The DP8473V has more analog components which is a bit worrisome though. I wonder how repeatable the circuit is or if its sensitive to part placement, tolerance stack up, etc.
            Last edited by NobodyIsHere; September 2, 2012, 12:30 PM.

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              #36
              I'd gladly buy this, even preorder, two at the minimum.

              Just checking I'm reading the PCB right, there is a second internal connector behind the external connector, so no need to make a special cable for more than two drives?
              Twitter / YouTube

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                #37
                This here is something I would find interest in, as long as it can be used along side an integrated controller such as the one in a PC-6300 that can't be disabled.

                Comment


                  #38
                  Originally posted by SpidersWeb View Post
                  I'd gladly buy this, even preorder, two at the minimum.

                  Just checking I'm reading the PCB right, there is a second internal connector behind the external connector, so no need to make a special cable for more than two drives?
                  Hi
                  The board has two connectors for a pair of internal floppy drives on each for a total of four internal floppy drives. One of the internal connectors is also common with an external connector so if you use it then you would have two internal floppy drives and two external floppy drives. No special cables necessary. Hopefully that makes sense.

                  Thanks and have a nice day!

                  Andrew Lynch

                  Comment


                    #39
                    Originally posted by Compgeke View Post
                    This here is something I would find interest in, as long as it can be used along side an integrated controller such as the one in a PC-6300 that can't be disabled.
                    Hi
                    That's the plan. I've got IO ports, IRQs, and DMA pins routing to everything that's available. You can make some pretty funky settings with this but the intent is to peacefully coexist with built in controllers. Where is your built in FDC located (0x3F0 or 0x370)? This controller supports both locations.

                    Thanks and have a nice day!

                    Andrew Lynch

                    Comment


                      #40
                      Originally posted by lynchaj View Post
                      PS, Chuck I wrote up a custom part DP8473V (PLCC-52) and added it to the schematic. Both FDCs are on the board now and we can decide on one the other or both later. They use very similar pins so it is an easy tweak. The DP8473V has more analog components which is a bit worrisome though. I wonder how repeatable the circuit is or if its sensitive to part placement, tolerance stack up, etc.
                      Shouldn't amount to a hill of beans on programming. Both, incidentally support 2.88M drives (how long has it been since anyone's seen any DSED floppies for sale?). I wouldn't let the analog components bother you--stick with 5% parts and I think you'll be fine--after all, they don't determine timing; they just form a low-pass filter so that PLL doesn't lock onto extraneous noise.

                      Cheers,
                      Chuck
                      Reach me: vcfblackhole _at_ protonmail dot com.

                      Comment


                        #41
                        Count me in!! I'd buy one or two for sure.

                        Comment


                          #42
                          Originally posted by lynchaj View Post
                          Hi
                          The board has two connectors for a pair of internal floppy drives on each for a total of four internal floppy drives. One of the internal connectors is also common with an external connector so if you use it then you would have two internal floppy drives and two external floppy drives. No special cables necessary. Hopefully that makes sense.

                          Thanks and have a nice day!

                          Andrew Lynch
                          Sounds perfect, can't wait
                          Twitter / YouTube

                          Comment


                            #43
                            I have about 30 DS-ED disks, and one standard 2.88mb floppy and one ps/2 2.88mb floppy

                            Originally posted by Chuck(G) View Post
                            Shouldn't amount to a hill of beans on programming. Both, incidentally support 2.88M drives (how long has it been since anyone's seen any DSED floppies for sale?). I wouldn't let the analog components bother you--stick with 5% parts and I think you'll be fine--after all, they don't determine timing; they just form a low-pass filter so that PLL doesn't lock onto extraneous noise.

                            Cheers,
                            Chuck
                            Nothing beats the roar of a 36yr old drive coming to life after a decade in storagg

                            Comment


                              #44
                              Originally posted by Chuck(G) View Post
                              how long has it been since anyone's seen any DSED floppies for sale?
                              A few minutes ago, at eBay item 220342277766

                              Comment


                                #45
                                Hi

                                We are going to have to talk about this sooner or later so we might as well get on with it.

                                For the XT-FDC project to come to reality it will need at least one full prototype board build and test cycle. I can get prototype boards made at a reasonable price so we are going to need two things:

                                1. volunteers for build and test; these should be hobbyists with experience in assembly and debugging prototype boards. There are some here who can do this and hopefully they will come forward.

                                2. $160 for 4 prototype boards; that's a big pill for someone to swallow all at once so I propose we spread this out. Everyone who would like to see the XT-FDC project succeed here is your chance to contribute!

                                Here is my plan for raising the funds for the prototype boards. Send what you can afford ($5, $10, $20, etc) by PayPal to LYNCHAJ@YAHOO.COM with "XT-FDC prototype" in the subject. I will segregate those funds into a pool. If we get to $160 I will post here to donating and refund anything above that amount. If we do not get to $160 I will let the pool sit until either it does or it is clear we are not going to make it. If we are not going to make it I will refund everyone who donated their money. Does that sound fair?

                                Please lets discuss. Like any project, the XT-FDC will have to go through its prototype build and test phase before production boards will be available. Hopefully this project can make it since there does appear to be many hobbyists here who seem interested.

                                Thanks and have a nice day!

                                Andrew Lynch

                                Comment

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