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8-Bit IDE Controller

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    8-Bit IDE Controller

    I'm "upgrading" my old Tandy 1000SX and need a 8-Bit IDE controller. Something like or similar to an Acculogic sIDE-1/16. Any leads would be greatly appreciated. eBay proves negative at this time.

    Thanx,

    Agent Orange
    Surely not everyone was Kung-Fu fighting

    #2
    there should be one or two on ebay in the ebay stores section, but the prices are ridiculous. i'd also love to know if anybody finds something reasonable, but of course Orange has first dibs.
    sigpic

    Comment


      #3
      have we, as a group, ever looked into building our own and getting a small supply of them made up? After researching alternates to my SCSI problem on an XT, I see there are schematics posted for one, and I know that collectively we have the skillset to design and create such a card. I *might* even be able to ask some of my coworkers to help-we have a hardware design team, a couple board layout guys, and we get custom made PCBs made several times a year. Something like this would probably only take up an hour of their time.

      I have no idea what a minimum order would be, or how much they would cost, or if parts can be sourced for such a relic, but I know I'd buy one in a heartbeat if I could, and I bet there are 10-20 others on this board alone would would do likewise.

      Just thinkin.

      Comment


        #4
        It would have to interface to an AT-IDE drive though, as the XT ones are as hard to find as the 8-bit boards.

        --T
        Teach your children how to think, not what, and hold 'em close, not tight.
        _____________________________________________

        Please visit the Vintage-Computer Wiki. Contributers welcome.

        Comment


          #5
          I have a very simple 8 bit controller that uses 16 bit drives. It has maybe 20 or 30 74ls IC and a boot ROM. I think it is limited to 512meg drives though.

          Anyone interested in trying to reverse engineer?

          Comment


            #6
            I have seen others mention doing this but its never panned out. Where is the schematic to build your own? Given that a dumb 8bit IDE controller requires no logic (just software or bios) I would think that a 16 bit variety would need some sort of flip flop and support chips to break 16bitters into 8 bits for the bus. The most simplistic solution would involve using a device driver to use the HD (I would not be against this solution if someone is willing to write a boot level driver for ide disk access) Or we need to integrate it into a bios which would be more complex for everybody since one would have to write a eeprom if they were assembling it themselves.

            I guess I would be game for a pair; if someone was nice enough to take on the endevour!

            Originally posted by hargle View Post
            have we, as a group, ever looked into building our own and getting a small supply of them made up? After researching alternates to my SCSI problem on an XT, I see there are schematics posted for one, and I know that collectively we have the skillset to design and create such a card. I *might* even be able to ask some of my coworkers to help-we have a hardware design team, a couple board layout guys, and we get custom made PCBs made several times a year. Something like this would probably only take up an hour of their time.

            I have no idea what a minimum order would be, or how much they would cost, or if parts can be sourced for such a relic, but I know I'd buy one in a heartbeat if I could, and I bet there are 10-20 others on this board alone would would do likewise.

            Just thinkin.

            Comment


              #7
              The thread in question with schematics and stuff came from here:

              http://www.vintage-computer.com/vcfo...ead.php?t=7243

              of which the main point of interest is here:

              http://www.mylinuxisp.com/~jdbaker/o...s/8bitIDE.html

              I admit, I have not really absorbed the details from that page yet.

              If we designed our own, we could also add an option ROM to it, and I (and a few others here) have x86 assembly experience and could likely write the appropriate hooks for INT13 to double pump the 16 bit data.

              edit:
              kb2syd: I'd love to disassemble that option rom on your board. I bet just scanning the PCB would get us a layout as well. Those things are pretty simple...
              Last edited by hargle; September 24, 2008, 12:19 PM.

              Comment


                #8
                How do I go about reading the boot rom on an ISA expansion card?

                I'll try to disassemble the binary and see what it is doing. It is socketed so I guess I could pull it and send it out to someone, but I'd rather not.

                Kelly

                Comment


                  #9
                  If you can find one of the 8-bit adapters, try going to an IDE-CF adapter. Most (if not all) CF cards can do 8 bit transfers.
                  Reach me: vcfblackhole _at_ protonmail dot com.

                  Comment


                    #10
                    Originally posted by hargle View Post
                    The thread in question with schematics and stuff came from here:

                    http://www.vintage-computer.com/vcfo...ead.php?t=7243

                    of which the main point of interest is here:

                    http://www.mylinuxisp.com/~jdbaker/o...s/8bitIDE.html

                    I admit, I have not really absorbed the details from that page yet.

                    If we designed our own, we could also add an option ROM to it, and I (and a few others here) have x86 assembly experience and could likely write the appropriate hooks for INT13 to double pump the 16 bit data.

                    edit:
                    kb2syd: I'd love to disassemble that option rom on your board. I bet just scanning the PCB would get us a layout as well. Those things are pretty simple...

                    Looks like a pretty simple layout. Probably fit on a 2.5" x 3.5" PCB quite nicely.

                    Perhaps, if I get some time, I'll fire up Eagle 5.2 and play around with it.
                    Legacy Computers and Parts

                    Sales of, parts for, and repairs to, Vintage and Legacy computers.

                    Comment


                      #11
                      there is one ebay store seller who has three of them, anally priced at $200 each.

                      http://cgi.ebay.com/IDE-Controller-C...3286.m20.l1116

                      http://cgi.ebay.com/IDE-Controller-C...3286.m20.l1116

                      http://cgi.ebay.com/IDE-Controller-C...3286.m20.l1116

                      if i had some money burning a hole in my pocket i'd pick one up, but that is pretty crazy!
                      sigpic

                      Comment


                        #12
                        Originally posted by kb2syd View Post
                        How do I go about reading the boot rom on an ISA expansion card?

                        I'll try to disassemble the binary and see what it is doing. It is socketed so I guess I could pull it and send it out to someone, but I'd rather not.

                        Kelly
                        http://www.brutman.com/PCjr/pcjr_downloads.html
                        pcjrcart.zip should work for dumping the image of it out to a file. You shouldn't need to pull the chip off the board or anything, just boot to DOS, run this and it'll locate your option ROMs and save them to files.

                        there is one ebay store seller who has three of them, anally priced at $200 each.
                        I certainly think we can get ours made for less than this. We might have to assemble them ourselves, which should be pretty easy, and if we add an option ROM to it, I will break the 512MB barrier in the int 13 support code.

                        Comment


                          #13
                          Wouldn't an 8 bit SCSI card be more usefull then a low capacity IDE card? You can still find small SCSI HDs, and SCSI is a lower CPU hog then IDE.
                          What I collect: 68K/Early PPC Mac, DOS/Win 3.1 era machines, Amiga/ST, C64/128
                          Nubus/ISA/VLB/MCA/EISA cards of all types
                          Boxed apps and games for the above systems
                          Analog video capture cards/software and complete systems

                          Comment


                            #14
                            Originally posted by Unknown_K View Post
                            Wouldn't an 8 bit SCSI card be more usefull then a low capacity IDE card? You can still find small SCSI HDs, and SCSI is a lower CPU hog then IDE.
                            My interest in this stems from the fact that I can't get my future domain 850-MER with 8.2 BIOS on it to work on a true IBM XT machine. It works on a zenith machine, but I wanted to be true blue, so I may have to abandon SCSI.

                            At work, I'm also working closely with IDE drives, so I'm very familiar with the ATA command set, and oddly enough, as of yesterday, I was actually tasked with creating an option ROM for an IDE controller, so my work and personal interest are running parallel at the moment. It's just meant to be.

                            and here's some scans of a device that I googled up:

                            http://home.fuse.net/bobwatts/acculogic%208%20bit.htm

                            It looks incredibly simple, although I'm a software guy, not hardware.

                            Comment


                              #15
                              Originally posted by hargle View Post

                              http://home.fuse.net/bobwatts/acculogic%208%20bit.htm

                              It looks incredibly simple, although I'm a software guy, not hardware.
                              And that is one of the ones I own.

                              Comment

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