Forum etiquette

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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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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.

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Stay close to the original topic being discussed
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To put things in engineering terms, we value a high signal to noise ratio. Coming here should not be a waste of time.
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"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:
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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.

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.
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GRiDCase Laptops

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    GRiDCase Laptops

    Hi Folks!

    Recently picked up a couple of GRiD laptops. 3x 1520's and a GRiDCase 3 Plus. The 1520's I've managed to get up and running. Had to do the DS1287 repair on two of them and plan on eventually replacing the 20Mb Conner HD's with CF cards (Is there anything in particular that causes the rubber seals to degrade on these old Conner drives? Had a couple that were almost completely gone and some are like new)

    The main problem is with the GRiDCase 3. It was fitted with one of those JVC 10Mb hard drives with the 26pin Interface (Is there an actual name for this interface?) which is dead and unfortunately there is no floppy drive. I've created a set of DOS ROMs so I can get the machine to boot up but I'm after suggestions on how I can add some storage to make the machine useful. Floppy drive - Seems to be a non-standard 26pin interface. Hard Drive - Finding a working replacement will be next to impossible and will probably involve removing one from a working machine.

    So, could an IDE drive be connected via the Parallel port and drivers loaded from ROM?

    There are two 34pin headers on the motherboard (One is used for the JVC controller) and I'm wondering if they are the equivalent of an ISA expansion? Long shot but does anybody have a service / technical manual?


    The port just under the drive of the gridcase2 is an external drive port, maybe although you have no internal drive there's a port for an external drive. If so, you might be able to attach an external drive to this port, if you can find something compatible. I checked, I don't have the manual. I used to support the GRiD Plus' many years ago when I worked at ICI.
    @ BillDeg:
    Twitter: @billdeg
    Youtube: @billdeg
    Unauthorized Bio


      Greetings Fellow GriD-ites,

      do either of you have any GRiD specific software, in particular GRiDBASIC or GRiDTerm? I have been looking for GRiD software for a while and keen to find new GRiD software. thanks.


        There is a 25pin D-connector on the side where the internal floppy would sit however, the ribbon cable has been cut inside. Without the pinouts, its not much use. I guess the best option is to keep an eye out for a faulty machine I can pull the floppy from although I really like the idea of building some sort of custom XT-IDE board

        As for software, I did get some with the machines. Seems to be a complete set of manuals & disks for the earlier compass series, incluiding GRiD DOS, Term, BASIC, Paint, etc. Its all on 5.25" disks which I plan to image this weekend. Is there a site where this can be uploaded?


          I have a copy of GRiD DOS on my web site in the GRiD section

          PM me if you want to send me the files, I am happy to host them on my site.

          @ BillDeg:
          Twitter: @billdeg
          Youtube: @billdeg
          Unauthorized Bio


            check out It tends to be 1500 specific. A long-time member submitted a bios mod which enables one to replace the connor drive. A common failure. It requires access to an eprom programmer and chip replacement. There are also many Grid 1500 apps available there.
            Last edited by Micom 2000; September 20, 2011, 02:46 PM.
            Economics isn't a real science. It's an evil art designed for the rich.


              I too have a Gridcase, the hard drive has been replaced with 4 eproms in the front, but it still does not power up. Is there a battery in there somewhere? There is a power supply where the battery used to be. Russ Campbell


                What exactly GridCase? 1520 not necessary battary for starting, just 16v DC power.