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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.

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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.

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

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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.


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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.

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Other suggestions
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IDE hard drive on an IBM PC Convertible

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    #46
    Did any progress get made on this? I've always loved the 5140, since first playing with one, not long after they were released.

    I also have a fully functional 5140, that I've been playing with.

    - Alex

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      #47
      Originally posted by ajacocks View Post
      Did any progress get made on this?
      So I guess it depends on how you define "progress". I have gotten my grubby talons on a 5140. Unfortunately it's a... ridden hard and put away wet specimen. I haven't had a lot of time to work with it yet but I did spend a few hours this last weekend trying to at least get it running:

      convertible-sml.jpg

      The keyboard is really badly shot; I have all the keys at least registering now, enough were completely dead that I couldn't really uses the machine (letter G, number 3, period...), but it took some soldering. The ALPS keyswitches in it are pretty badly corroded and I'm not sure if they're the stock ones or if someone swapped the ones that are in there for more desirable originals? Solder joints on the keyboard's PCB are kind of suspiciously bad. The machine is still hanging at random sometimes, especially when accessing the B floppy drive. Hopefully I can get the kinks smoothed down enough to feel like I can trust trying to engineer something with it.

      I haven't had a chance to crack open the parallel-serial module and start buzzing the connections to its internal card edge yet. I assume they're mostly mapped 1:1 with the back-edge connector but they could be swapped/mirrored. If anyone out there has a line on the female mating connector for the modules so I could target that directly that would still be awesome.
      My Retro-computing YouTube Channel (updates... eventually?): Paleozoic PCs Also: Blogspot

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        #48
        Picking up this thread again after a lengthy hiatus...

        Originally posted by Chuck(G) View Post
        Anyone got an accurate photo? Maybe I can help.
        I finally got around to cracking open the parallel/serial slice for an IBM Convertible. The slice contains a circuit board with an edge connector that plugs into this weird little splitter assembly that has two of the connectors that would be *really* nice to be able to find, in two versions.

        The heart of the connector is a circuit board which makes up the male passthrough connector, which has a total of 72 contacts split into two 2x18 sections. The female connector facing the computer is soldered to what looks like an identical card edge using a version of the connector that has two rows of inwardly canted fingers, while the female connector that faces upwards is through-hole with four staggered rows of pins.

        Unless I miscounted twice pitch of the connectors appears to be about 16 contacts per inch. I've completely failed to turn up any hits for any standard or metric translation of that I could come up with. This whole assembly appears to have been made by one company, the female connectors have molded into them the same double-sided "P" / slash / badly made pretzel logo you can see on the bottom of the PCB. Here's some pictures.

        whole.jpgtop-orientation.jpgbottom-orientation.jpgend-orientation.jpg

        If anyone has any hint as to where a batch of the female connectors could be had (I'd settle for either the edge-on or the through hole) that's be awesome.
        Last edited by Eudimorphodon; May 2, 2020, 12:59 PM.
        My Retro-computing YouTube Channel (updates... eventually?): Paleozoic PCs Also: Blogspot

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