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

IBM 5140 disassembly

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

    IBM 5140 disassembly

    Hi all,

    Well I finally got myself a 5140, but alas no PSU and the keyboard seems to have come lose

    Anyway before powering it up I want to take it apart, fix the keyboard and make sure everything looks OK inside.

    I've been following the disassembly guide on :

    http://www.tavi.co.uk/ps2pages/ohland/5140.html

    However my machine also has the Parallel / Serial adapter, I've got as far as taking the cover off the back of the machine that is over the serial / parallel board, but cannot get any further. I presume that I'll have to remove the ser/par board to get to the real back of the machine, but I'm unsure of how to proceed as it seems pretty solidly fixed on there.

    So does anyone know how to get this sucker off ?

    Cheers.

    Phill.

    #2
    Look on one of the sides of the serial\parallel addon, there should be a small switch you pull back and it comes off, or at least my 5140 printer is that way.

    Comment


      #3
      Be careful taking apart he 5140 it is very fragile. In fact you really don't need to get to the back of the machine for any reason. The Keyboard can be lifted up for inspection. Underneath it you will find access to the memory (for adding more RAM). If you do continue to take it apart make sure to be gentle in removing the floppy drives. They have little tabs on the bottom that break off easily.
      Current Wish List: 1. IBM 7531 Industrial Series PC 2. NEC MultiSync XL (JC-2001) Monitor 3. MicroSolutions UniDOS card 4. Compaq 14" VGA CRT Monitor (the one that came with the SystemPro). 5. Stacker HW CoProcessor Board MCA BUS. If you have any of the above for sale please PM me. Thank you!

      Comment


        #4
        Originally posted by Compgeke View Post
        Look on one of the sides of the serial\parallel addon, there should be a small switch you pull back and it comes off, or at least my 5140 printer is that way.
        Bingo!

        Thanks for that I figured it had to be something like that, one of those situatiions of once you know you know

        Cheers.

        Phill.

        Comment


          #5
          Originally posted by Shadow Lord View Post
          Be careful taking apart he 5140 it is very fragile. In fact you really don't need to get to the back of the machine for any reason. The Keyboard can be lifted up for inspection. Underneath it you will find access to the memory (for adding more RAM). If you do continue to take it apart make sure to be gentle in removing the floppy drives. They have little tabs on the bottom that break off easily.
          Well as the machine was unknown I wanted to at least check that the PSU section wasn't fried ! But I have not removed the section with the drives in.

          Managed to get the keyboard out and unplugged just need to figure out a way of re attaching the keyboard to the top plate as two of the retaining posts have had the top part shear off, annoyingly opposite corners

          I also have 3 keys, right ALT and two of the arrows that have broken off, though the actual keys still work.


          Machine has 512K of memory (4 memory boards, so I presume 4x128K), have to look for (or make) a 256K board.

          Thankfully both drives seem to work, I booted my dos5 install disk and was able to read the other, will try formatting disks to make sure.

          I still need to test the battery, though if it's dead I may just leave it disconnected, as I have a universal laptop PSU to run it off.
          One thing I did notice is it looks like there is apace on top of the battery compartment where something was intended to go, was this where the modem was, it strikes me that it may be possible to use the modem connector to fit a hard disk or CF card internally, obviously you'd need to write a BIOS for it tho.

          Cheers.

          Phill.

          Comment


            #6
            A good thing about that keyboard is it uses Alps switches, so replacing a key switch isn't as hard as a rubberdome. All that you really need to do is find an old Alps board that was trashed or something and pull a switch off. I believe the 5140 has three different types, which are simply for the feel (some are stiffer than others), however a common white Alps should work fine.

            You can also get a new 5140 power cord cheap on ebay, although I have no idea how much shipping would be to your location (I doubt international shipping will be cheap).
            http://www.ebay.com/itm/230457176052

            Comment


              #7
              Originally posted by Compgeke View Post
              A good thing about that keyboard is it uses Alps switches, so replacing a key switch isn't as hard as a rubberdome. All that you really need to do is find an old Alps board that was trashed or something and pull a switch off. I believe the 5140 has three different types, which are simply for the feel (some are stiffer than others), however a common white Alps should work fine.
              Ahh yes they looked like a common type, though in this case it wasn't the key itself that was broken it was the keycap, successfully super-glued them back on last night

              You can also get a new 5140 power cord cheap on ebay, although I have no idea how much shipping would be to your location (I doubt international shipping will be cheap).
              http://www.ebay.com/itm/230457176052
              Ohhh thanks for that I might actually go for that as the current PSU is a universal laptop one, and because the power connector is so deep inside the case I had to make up a little lead to adapt it. Besides having the proper PSU would be good.

              Cheers.

              Phill.

              Comment


                #8
                Originally posted by prime View Post
                Well as the machine was unknown I wanted to at least check that the PSU section wasn't fried ! But I have not removed the section with the drives in.

                Managed to get the keyboard out and unplugged just need to figure out a way of re attaching the keyboard to the top plate as two of the retaining posts have had the top part shear off, annoyingly opposite corners

                I also have 3 keys, right ALT and two of the arrows that have broken off, though the actual keys still work.


                Machine has 512K of memory (4 memory boards, so I presume 4x128K), have to look for (or make) a 256K board.

                Thankfully both drives seem to work, I booted my dos5 install disk and was able to read the other, will try formatting disks to make sure.

                I still need to test the battery, though if it's dead I may just leave it disconnected, as I have a universal laptop PSU to run it off.
                One thing I did notice is it looks like there is apace on top of the battery compartment where something was intended to go, was this where the modem was, it strikes me that it may be possible to use the modem connector to fit a hard disk or CF card internally, obviously you'd need to write a BIOS for it tho.

                Cheers.

                Phill.
                Phill,

                The PSU is actually accessible from the back. It is a small circuit board. I have the original instructions on accessing it. I will try and scan them tonight or tomorrow and post them. The battery will either be dead or close to it. Mine has 5 minutes of juice in it in one, and the other one was completely dead.... I am not sure exactly where you are talking about above the battery. The modem jacks come out the side of the main unit (opposite from the power button). If you can post a picture of what you are talking about I'll see. It is a fun little unit but really limited - if it even had one ISA slot or a way to add a HDD through a plug-in module (ala the side car mods on the PC Jr.) it would be a much more usable unit. Have fun with it.
                Current Wish List: 1. IBM 7531 Industrial Series PC 2. NEC MultiSync XL (JC-2001) Monitor 3. MicroSolutions UniDOS card 4. Compaq 14" VGA CRT Monitor (the one that came with the SystemPro). 5. Stacker HW CoProcessor Board MCA BUS. If you have any of the above for sale please PM me. Thank you!

                Comment


                  #9
                  I've not been paying close attention, but if you need some scans from the Technical Reference manual I can do that for you. (I was lucky enough to get the manuals from another forum member, so I need to spread the wealth/knowledge.)

                  Comment


                    #10
                    thread necro'ing - mb; did you put the scans up somewhere? I may have slipped and acquired a 5140

                    Comment


                      #11
                      Originally posted by erikarn View Post
                      thread necro'ing - mb; did you put the scans up somewhere? I may have slipped and acquired a 5140
                      There is a link to the Technical Reference at [here].

                      Comment


                        #12
                        Thanks folks - especially Compgeke - I Just picked up a PC Convertible and could not figure out how to get the Serial Extension off.

                        Comment

                        Working...
                        X