Announcement

Collapse

Forum Rules and Etiquette

Our mission ...

This forum is part of our mission to promote the preservation of vintage computers through education and outreach. (In real life we also run events and have a museum.) We encourage you to join us, participate, share your knowledge, and enjoy.

This forum has been around in this format for over 15 years. These rules and guidelines help us maintain a healthy and active community, and we moderate the forum to keep things on track. Please familiarize yourself with these rules and guidelines.


Rule 1: Remain civil and respectful

There are several hundred people who actively participate here. People come from all different backgrounds and will have different ways of seeing things. You will not agree with everything you read here. Back-and-forth discussions are fine but do not cross the line into rude or disrespectful behavior.

Conduct yourself as you would at any other place where people come together in person to discuss their hobby. If you wouldn't say something to somebody in person, then you probably should not be writing it here.

This should be obvious but, just in case: profanity, threats, slurs against any group (sexual, racial, gender, etc.) will not be tolerated.


Rule 2: Stay close to the original topic being discussed
  • If you are starting a new thread choose a reasonable sub-forum to start your thread. (If you choose incorrectly don't worry, we can fix that.)
  • If you are responding to a thread, stay on topic - the original poster was trying to achieve something. You can always start a new thread instead of potentially "hijacking" an existing thread.



Rule 3: Contribute something meaningful

To put things in engineering terms, we value a high signal to noise ratio. Coming here should not be a waste of time.
  • This is not a chat room. If you are taking less than 30 seconds to make a post then you are probably doing something wrong. A post should be on topic, clear, and contribute something meaningful to the discussion. If people read your posts and feel that their time as been wasted, they will stop reading your posts. Worse yet, they will stop visiting and we'll lose their experience and contributions.
  • Do not bump threads.
  • Do not "necro-post" unless you are following up to a specific person on a specific thread. And even then, that person may have moved on. Just start a new thread for your related topic.
  • Use the Private Message system for posts that are targeted at a specific person.


Rule 4: "PM Sent!" messages (or, how to use the Private Message system)

This forum has a private message feature that we want people to use for messages that are not of general interest to other members.

In short, if you are going to reply to a thread and that reply is targeted to a specific individual and not of interest to anybody else (either now or in the future) then send a private message instead.

Here are some obvious examples of when you should not reply to a thread and use the PM system instead:
  • "PM Sent!": Do not tell the rest of us that you sent a PM ... the forum software will tell the other person that they have a PM waiting.
  • "How much is shipping to ....": This is a very specific and directed question that is not of interest to anybody else.


Why do we have this policy? Sending a "PM Sent!" type message basically wastes everybody else's time by making them having to scroll past a post in a thread that looks to be updated, when the update is not meaningful. And the person you are sending the PM to will be notified by the forum software that they have a message waiting for them. Look up at the top near the right edge where it says 'Notifications' ... if you have a PM waiting, it will tell you there.

Rule 5: Copyright and other legal issues

We are here to discuss vintage computing, so discussing software, books, and other intellectual property that is on-topic is fine. We don't want people using these forums to discuss or enable copyright violations or other things that are against the law; whether you agree with the law or not is irrelevant. Do not use our resources for something that is legally or morally questionable.

Our discussions here generally fall under "fair use." Telling people how to pirate a software title is an example of something that is not allowable here.


Reporting problematic posts

If you see spam, a wildly off-topic post, or something abusive or illegal please report the thread by clicking on the "Report Post" icon. (It looks like an exclamation point in a triangle and it is available under every post.) This send a notification to all of the moderators, so somebody will see it and deal with it.

If you are unsure you may consider sending a private message to a moderator instead.


New user moderation

New users are directly moderated so that we can weed spammers out early. This means that for your first 10 posts you will have some delay before they are seen. We understand this can be disruptive to the flow of conversation and we try to keep up with our new user moderation duties to avoid undue inconvenience. Please do not make duplicate posts, extra posts to bump your post count, or ask the moderators to expedite this process; 10 moderated posts will go by quickly.

New users also have a smaller personal message inbox limit and are rate limited when sending PMs to other users.


Other suggestions
  • Use Google, books, or other definitive sources. There is a lot of information out there.
  • Don't make people guess at what you are trying to say; we are not mind readers. Be clear and concise.
  • Spelling and grammar are not rated, but they do make a post easier to read.
See more
See less

floppy drive woes. (IBM model 25)

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    floppy drive woes. (IBM model 25)

    It seems like this machine is going to fight me on everything I try to do with it. For the record, my penultimate goal would be to have a 1.4mb 3.5 floppy internal, original hard drive, and an external IBM branded 1.2mb 5.25 drive. I have a small pile of 5.25 booter games i'd like to be able to use.

    A month ago, I found a business-land internal to external floppy drive adapter. It seems it was specifically designed for IBM PS/2's and is about as 'plug-and-play' as one could expect. However, no matter what I tried, it would not work. The bios will "see" the drive and label it at B: automatically, but it could not read or write any disks. I am inclined to believe that the bios is expecting a 720k 3.5 drive and refuses to acknowledge anything else.

    So I gave up on that when I found a box of ide cards on ebay. The jewel in the box was a Future Domain TMC-885. http://stason.org/TULARC/pc/hard-dis...l#.Ubo_avm1G30

    This card is supposed to be bootable isn't it? The bios will respond during post, but if I disconnect the on-board hard drive, it still won't boot. I can't seem to disable the onboard ide/floppy interface. The starter disk is NO help at all. It is nothing more than a glorified diagnostic disk. That said, if I boot to dos from another source, I can use the utilities I found on Adaptec's website to access the hard drive. I can low level the drive as well as basic diagnostics and everything comes back fine, however the drive isn't being reported to dos by the bios. So fdisk fails.

    What am I missing here? I have to admit my knowledge of pre-286 machines would fill a business card on a good day. Any assistance would be appreciated.
    It is a mistake to think you can solve any major problems just with potatoes.

    #2
    I'm fairly certain that IBM required the use of an IBM branded SCSI adapter in the Model 25, such as the TMC-850IBM

    Comment


      #3
      the 850 is just a scsi card without the floppy bits. same processors as the 855, I wonder if it is just a firmware issue. maybe upgrading from 6.02 to 8 (or whatever) would help?
      It is a mistake to think you can solve any major problems just with potatoes.

      Comment


        #4
        Originally posted by luckybob View Post
        the 850 is just a scsi card without the floppy bits. same processors as the 855, I wonder if it is just a firmware issue. maybe upgrading from 6.02 to 8 (or whatever) would help?
        My 850 has an IBM copyrighted BIOS, works great in my Model 25 (pretty sure it was made for Model 25/30 use). I could try to dump it if someone wanted to burn it to a NON-IBM 850 card (or if you wanted to try it on your 855, probably loosing its FDC abilities).

        I know the 25 is a fickle ***** when it comes to bootable add-in cards as to where their memory address is, you could try playing with that, also without being able to disable the onboard FDC, I seriously doubt you will ever get a the floppy working on your add-in card, unless it can be set as some kind of secondary FDC (which might look possible based on jumpers, not sure though).

        There IS some hope to getting a 1.44 internal on the onboard FDC though, I will wait till evildragon stops by to tell us which exact models work, but the 25 CAN see certain models of the "small button" 1.44MB PS/2 floppy drives.
        My Vintage computer/blog site
        Searching for a keyboard for a WYSEpc WY-1100.

        Comment


          #5
          I certainly would not mind a copy of your bios! I ordered a programmer just the other day and as soon as it gets here from the great white north. I have actually 4-5 projects I need to finish with it! While on the subject, I couldn't find any mention of an updated bios/firmware for the model 25. My chips are marked 1.2 is there something newer out there? maybe something that plays nice with upgrades?
          It is a mistake to think you can solve any major problems just with potatoes.

          Comment


            #6
            Originally posted by luckybob View Post
            I certainly would not mind a copy of your bios!
            I will try to work on that this coming weekend, only have so much room to work on my old PCs right now, and right now the 25 isn't on the bench.

            Originally posted by luckybob View Post
            I ordered a programmer just the other day and as soon as it gets here from the great white north.
            Out of curiosity, I have been thinking about buying a programmer, what one did you go with?

            Originally posted by luckybob View Post
            I couldn't find any mention of an updated bios/firmware for the model 25. My chips are marked 1.2 is there something newer out there? maybe something that plays nice with upgrades?
            As far as the Model 25 BIOS I do not know of any other revisions, but I could be wrong.
            My Vintage computer/blog site
            Searching for a keyboard for a WYSEpc WY-1100.

            Comment


              #7
              When I asked for advice here, this one came highly recommended: http://www.mcumall.com/comersus/stor...idproduct=4282

              I probably could have gotten a knockoff from china but in all honesty, the less I buy from that place the better.

              Also, I actually meant a copy of the scsi bios, not the model 25's. (unless yours is different, then both would be awesome!)
              It is a mistake to think you can solve any major problems just with potatoes.

              Comment


                #8
                Originally posted by luckybob View Post
                When I asked for advice here, this one came highly recommended: http://www.mcumall.com/comersus/stor...idproduct=4282

                I probably could have gotten a knockoff from china but in all honesty, the less I buy from that place the better.
                I will have to check them out, and I hear ya, can get a lot of stuff cheaper from china, but in general you get what you pay for, sometimes its best to pony up the cash for quality, especially for tools that you will use a lot

                Originally posted by luckybob View Post
                Also, I actually meant a copy of the scsi bios, not the model 25's. (unless yours is different, then both would be awesome!)
                Yeah, I knew that, still have to get it out of storage and on to my bench to dump the ROM
                My Vintage computer/blog site
                Searching for a keyboard for a WYSEpc WY-1100.

                Comment


                  #9
                  Originally posted by luckybob View Post
                  When I asked for advice here, this one came highly recommended: http://www.mcumall.com/comersus/stor...idproduct=4282

                  I probably could have gotten a knockoff from china but in all honesty, the less I buy from that place the better.
                  Dont worry - that programmer is still made in China, and has complete with Chinglish instruction manual That said... it works well. Has a bit of trouble with the higher-voltage chips, but you can use an external power adapter to give it the extra oomph necessary. All in all, it's a solid buy, and one that several of forums members use.
                  ---
                  Currently seeking:
                  * Roland MPU-401/AT (with daughter card header)
                  * Magitronic K-156 Keyboard (5pin DIN w/ XT-AT switch)
                  I also collect PC and C64 Sierra On-Line software!

                  Comment


                    #10
                    Originally posted by Maverick1978 View Post
                    ...complete with Chinglish instruction manual ...

                    I thought the accepted term was Engrish
                    My Vintage computer/blog site
                    Searching for a keyboard for a WYSEpc WY-1100.

                    Comment

                    Working...
                    X