Announcement

Collapse

Forum 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.


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.


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.



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.


"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.

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

External 720kb floppy drive on IBM 5160 XT

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

    External 720kb floppy drive on IBM 5160 XT

    Hi all. I have an IBM 5160 XT. I recently picked up an IBM external floppy drive (720kb, 3 1/2") which connects to the floppy drive controller card via the pin connector on the card:
    2eafbc372bee28940.jpg
    I was unable to access it and I'm wondering if there's some setting I need to change, maybe add a jumper to the controller card?
    I read through the manual for this computer and it did mention that dip switches 7 & 8 control the number of floppy drives but specifically the 5 1/4" floppy drives. I tried changing the dip switch settings to two drives anyway (switch 7 off, 8 on) but this did not let me access the drive. It did prevent dos from switching my existing 5 1/4" 360k internal floppy drive from A: to B: (as it does when you have one drive and you enter "B:") but there was no signs of activity on the external drive.

    Also, I would like to open this up to clean the heads and lubricate the rails but don't see any screws? I assume there's some kind of clips that need to be ... un-clipped? But if anyone has any experience with these drives before I go smashing it and causing all kinds of cosmetic damage to the casing can you please enlighten me?

    #2
    Where is your power supply for the drive? The 5160 floppy controller doesn't supply power.

    Comment


      #3
      Originally posted by Chuck(G) View Post
      Where is your power supply for the drive? The 5160 floppy controller doesn't supply power.
      Hmm okay that would be a problem. The drive doesn't have any other connections on it besides the one cable so I assumed the power would go through that.

      Comment


        #4
        Probably. There were brackets with a 34 pin header and 4-pin Molex inside and a DC37F on the outside. The idea is that you'd daisy-chain the internal floppy connector to it, which would then supply power. Some third-part FDC cards, such as the Sysgen Omnibridge and the Micro Solutions Compaticard were equipped with jumpers to supply power.

        I think that this may be a PS/2 device, however--and you're missing the bracket that provides power and floppy support.

        That doesn't mean that you can't use it on your XT, so long as you figure out a way to get power to it.

        Comment


          #5
          Originally posted by Chuck(G) View Post
          Probably. There were brackets with a 34 pin header and 4-pin Molex inside and a DC37F on the outside. The idea is that you'd daisy-chain the internal floppy connector to it, which would then supply power. Some third-part FDC cards, such as the Sysgen Omnibridge and the Micro Solutions Compaticard were equipped with jumpers to supply power.

          I think that this may be a PS/2 device, however--and you're missing the bracket that provides power and floppy support.

          That doesn't mean that you can't use it on your XT, so long as you figure out a way to get power to it.
          Yeah looks like I'll have to open it up and see how to do that.

          Comment


            #6
            also ... just realized I posted this in the wrong board. Sorry about that mods

            Comment


              #7
              I recently went through this. On the DC-37 power pins are as follows:

              1: +12V
              2: 12V return
              3: 5V return
              4: +5V

              Comment


                #8
                Originally posted by maxtherabbit View Post
                I recently went through this. On the DC-37 power pins are as follows:

                1: +12V
                2: 12V return
                3: 5V return
                4: +5V
                Thank you!

                Comment


                  #9
                  If you want to make your 4865 "IBM original" you can add a pigtail to the DC shell using a 4-pin AMP Mate-N-Lok connector.
                  https://www.digikey.com/en/products/...72338-1/744764

                  That was the only difference between the XT and AT versions of this floppy drive. I did it by depinning the 4 power pins from the D-sub, stripping a bit of insulation, soldering on 4 conductors, heat shrinking them, and re-inserting the pins back into the DC-37. Then run your 4 wires out the back of the shell and crimp on the contacts for the mate-n-lok. The pinout is available here:
                  http://www.vcfed.org/forum/showthrea...871#post147871

                  Comment

                  Working...
                  X