Reusing EPROM's

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  • pentium
    Badcaps Legend
    • Mar 2006
    • 2778
    • Canada

    #1

    Reusing EPROM's

    Recently I tore a whole bunch of Z80 cpu's and 256k windowed EPROM's out of some register terminals and I have a question.
    After you blank the EPROM chips, can you just plug them into a programmer and use them again?
    Find Nedry!


    Check the Vending machines!!

    <----Computer says I need more beer.
  • linuxguru
    Badcaps Legend
    • Apr 2005
    • 1564

    #2
    Re: Reusing EPROM's

    Yes, but you'll need a UV eraser to erase them. You can't erase them electrically.

    Comment

    • kc8adu
      Super Moderator
      • Nov 2003
      • 8829
      • U.S.A!

      #3
      Re: Reusing EPROM's

      yes.
      look for a germicidal lamp.
      its a clear fluorescent tube.find one sized to fit a fixture you alredy have.
      i use a 15w 18" in an aquarium hood.
      careful though as they will destroy your eyes if you look at it without some sort of glasses.

      Comment

      • pentium
        Badcaps Legend
        • Mar 2006
        • 2778
        • Canada

        #4
        Re: Reusing EPROM's

        Will the lamp out of a UV pond sterilizer cut it?
        Find Nedry!


        Check the Vending machines!!

        <----Computer says I need more beer.

        Comment

        • kc8adu
          Super Moderator
          • Nov 2003
          • 8829
          • U.S.A!

          #5
          Re: Reusing EPROM's

          yes.
          thats what mine was for.
          i think its a g15t8

          Comment

          • pentium
            Badcaps Legend
            • Mar 2006
            • 2778
            • Canada

            #6
            Re: Reusing EPROM's

            Now they are blank, how do you reprogram them?
            Find Nedry!


            Check the Vending machines!!

            <----Computer says I need more beer.

            Comment

            • starfury1
              Badcaps Legend
              • May 2006
              • 1256

              #7
              Re: Reusing EPROM's

              you will need a eprom burner of some type
              One I used to have was for a PC AT....you will then of course need software

              There some stand alone jobs and you may find constructional projects for them on the net.

              you will have to check the details on the eproms you are using as some had different voltages and possibly (if memory serves pinouts slightly different).
              (some pins I think had double functions)

              Really depends on who made it I suppose are they like 27C256 ?
              At the 256K level they may be a bit more standard ...dont know, but the old 16/32K were a bit of a mixed bag.

              So yeah a Eprom burner that supports what you got is what you need, they will probably be a garden variety.
              I would chase up the specs on them to be sure thought

              you got me thinking back 20+ years now....

              HTH

              Cheers
              You step into the Road, and if you don't keep your feet, there is no knowing where you may be swept off to." Bilbo Baggins ...

              Comment

              • starfury1
                Badcaps Legend
                • May 2006
                • 1256

                #8
                Re: Reusing EPROM's

                BTW don't over cook them
                You step into the Road, and if you don't keep your feet, there is no knowing where you may be swept off to." Bilbo Baggins ...

                Comment

                • pentium
                  Badcaps Legend
                  • Mar 2006
                  • 2778
                  • Canada

                  #9
                  Re: Reusing EPROM's

                  Really depends on who made it I suppose are they like 27C256 ?
                  Yep, they are the 27C256 variety.
                  Find Nedry!


                  Check the Vending machines!!

                  <----Computer says I need more beer.

                  Comment

                  • Maxxarcade
                    Badcaps Veteran
                    • Jul 2006
                    • 973

                    #10
                    Re: Reusing EPROM's

                    I've got an EETools RomMax that is designed for use with PC's up to 166Mhz (Needs an ISA slot). I used to use it for programming BIOS chips back when they were socketed, but it has been sitting around for years now

                    I'll see about posting a pic of it when I get home. I'd let it go pretty cheap if someone can use it. Only problem is you need an old DOS computer cause it won't work in Windows.
                    Last edited by Maxxarcade; 08-27-2007, 03:19 PM.

                    Comment

                    • Maxxarcade
                      Badcaps Veteran
                      • Jul 2006
                      • 973

                      #11
                      Re: Reusing EPROM's

                      Here's a rom programmer. This is just a little one, they get much bigger and more expensive. Up to ~$10k or so for a full featured setup that can program anything under the sun.

                      Newer ones are USB, or at least paralell port. This one uses a dedicated control card and can only program up to 8 meg 32 pin chips.

                      Attached Files

                      Comment

                      • pentium
                        Badcaps Legend
                        • Mar 2006
                        • 2778
                        • Canada

                        #12
                        Re: Reusing EPROM's

                        That's just like what I want.
                        Quick connect AND isa-based interface.
                        You must of paid a pretty penny.
                        Find Nedry!


                        Check the Vending machines!!

                        <----Computer says I need more beer.

                        Comment

                        • starfury1
                          Badcaps Legend
                          • May 2006
                          • 1256

                          #13
                          Re: Reusing EPROM's

                          I meant to get back to this post earlier

                          Yeah Maxx thats the type of thing I had....it was dos based.

                          Think pentium probably has an old box that could handle it

                          heres one I found on the net
                          eprom programmer

                          this should give you an insight on how they work but its not a complete page on one Here
                          (seems there selling not giving you a constructional artical)

                          another page here

                          second page here is good for understanding what what with an eprom but I think you maybe past that level pentium site here

                          this is dealing with 64's and when they mention Turbo Pascal 5.5 you know its old but some info may help site here
                          (links seem to be dead)

                          Dont know how accurate, good or works well any of the above is but hope it helps

                          Cheers
                          You step into the Road, and if you don't keep your feet, there is no knowing where you may be swept off to." Bilbo Baggins ...

                          Comment

                          • Maxxarcade
                            Badcaps Veteran
                            • Jul 2006
                            • 973

                            #14
                            Re: Reusing EPROM's

                            I tried to sell the RomMax a while back and couldn't get $25 for it It cost about $200 new I think.

                            Comment

                            • starfury1
                              Badcaps Legend
                              • May 2006
                              • 1256

                              #15
                              Re: Reusing EPROM's

                              mine was about that too
                              You step into the Road, and if you don't keep your feet, there is no knowing where you may be swept off to." Bilbo Baggins ...

                              Comment

                              • pentium
                                Badcaps Legend
                                • Mar 2006
                                • 2778
                                • Canada

                                #16
                                Re: Reusing EPROM's

                                would something like that also be capable of dumping the contents of an eprom/prom chip?
                                I have an SGI here that has buggy eprom chips. I could be able to revive the system if I could reload them with either a chip image or a copy I debugged.
                                Find Nedry!


                                Check the Vending machines!!

                                <----Computer says I need more beer.

                                Comment

                                • starfury1
                                  Badcaps Legend
                                  • May 2006
                                  • 1256

                                  #17
                                  Re: Reusing EPROM's

                                  yeah they should read as well as write eproms....

                                  Thats the idea program reprogram.

                                  good luck with it Pentium....I know I had some fun doing stuff like that
                                  You step into the Road, and if you don't keep your feet, there is no knowing where you may be swept off to." Bilbo Baggins ...

                                  Comment

                                  • Maxxarcade
                                    Badcaps Veteran
                                    • Jul 2006
                                    • 973

                                    #18
                                    Re: Reusing EPROM's

                                    Fixing/updating Eproms is what I used it for. It can save chip contents to a file, and most programmers even have a simple built in hex editor. I would have used the RomMax a lot longer if it had supported chips bigger than 8 meg.

                                    What type of chips are you working with? If they are EPROMS, they usually will start with 27 in the part number. Such as 2716, 2764, 27256, 27010 etc.

                                    Edit- I just remembered you said 27C256. Those will work with almost any programmer. That's another thing I liked about the RomMax, it had the ability to auto-detect most types of EPROMS. Different brands use different voltages and timings for programming.
                                    Last edited by Maxxarcade; 08-29-2007, 04:05 PM.

                                    Comment

                                    • pentium
                                      Badcaps Legend
                                      • Mar 2006
                                      • 2778
                                      • Canada

                                      #19
                                      Re: Reusing EPROM's

                                      Oh so you can dump the contents of a chip from one of these?
                                      Find Nedry!


                                      Check the Vending machines!!

                                      <----Computer says I need more beer.

                                      Comment

                                      • starfury1
                                        Badcaps Legend
                                        • May 2006
                                        • 1256

                                        #20
                                        Re: Reusing EPROM's

                                        yep read it, save as a file and work on it the dump it back.
                                        mind you its usually a saved hex file
                                        So whatever software you use would have to be able to disassemble this.
                                        In the old days you would use, say assembler to write the program then compile it to the hex code file for burning.

                                        I am guessing if you are wanting to edit BIOS chips you are really going to need the the manufacturers software for this.

                                        Unless you know what hex bits at what addresses to change there is not much you can do with the hex editor.

                                        suppose it really depend on what you working on and how you are going to use it.

                                        If you just want to do a straight copy and save the file as a backup
                                        no worries with that
                                        Last edited by starfury1; 08-30-2007, 01:47 AM.
                                        You step into the Road, and if you don't keep your feet, there is no knowing where you may be swept off to." Bilbo Baggins ...

                                        Comment

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