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

Perkin Elmer/Interdata VT-2222 disk drive, never used, & brand new 5440 HD cart $100

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

  • cclaunch
    replied
    Thank you, Chuck.

    Leave a comment:


  • Chuck(G)
    replied
    I've posted this over on the cctalk mailing list--more likely to find interested folks in minicomputer stuff. That 029 sounds pretty cool, BTW--and brings back memories of spending hours punching on 024, 026 and 029 gear--then taking the decks over to the 407 to get an 80-80 listing and then meticulously hand-checking.

    Some folks wonder why one corner of a punch card was cut at a 45 degree angle. For me, it was an easy way to mark cards needing correction--just flip the card upside-down in the deck and it sticks out like a sore thumb...

    Leave a comment:


  • Perkin Elmer/Interdata VT-2222 disk drive, never used, & brand new 5440 HD cart $100

    SOLD

    IBM first introduced the 14" platter based cartridge disk drives with the 2310 drive and IBM 1130 computer back in 1964, with that format becoming wildly popular for use with minicomputers and small mainframes. Vendors such as DEC with its RK05, Diablo with its model 30 series and many other vendors produced similar drives using the 2315 cartridge format. With the introduction of the System/3 by IBM, a change was made to the 14" platter format. The 5440 cartridge became a top loading pack, but was very similar otherwise to the 2315 based drives.


    Vendors introduced higher density versions of these drives, increasing the bit density around a track, increasing the number of cylinders recorded on the pack, increasing the number of cylinders on a pack, and introducing a second fixed platter that rotates simultaneously with the platter in the cartridge so that there are four heads (and tracks) for each cylinder. The capacity of a 14" platter cartridge drive increased over time from 1.25MB to 10MB and more through these density improvements.

    Interdata, a maker of minicomputers, was acquired by Perkin-Elmer who used them as the controller for its more complex scientific instruments before entering the computer market directly through this acquisition. These disk drives are from the Perkin-Elmer era, 1973 and onwards.

    This drive is brand new, never installed or used. The shipping restraint and other labeling are still on the unit. It was purchased by a Hollywood soundman for a project that was never completed and sat in his collection until they were sold upon his death. I have two identical drives (sold as separate listings) and each comes with a used 5440 style cartridge for use with the disk. The cartridge is set with 24 sectors per rotation and supports the 2200 bit per inch high density recording and 200 track per inch spacing of cylinders.

    I believe therefore that this drive provides 404 cylinders of capacity on the removable 14" pack (5440 or System/3 style) and simultaneously on a fixed platter underneath. Like a double high density version of the 5444 model 2 drive from the System 3, offering 10MB of capacity in one drive. I don't have the manuals for the drive to double check this.

    This drive is perfect for the hobbyist who wants to spend a bit of time interfacing to a vintage drive in perfect condition. It is also perfect if you have an Interdata (Perkin-Elmer) minicomputer that can use this to augment its storage capacity.

    I have two sets - two drives each with a used pack - $100 each or $200 for all

    Local pickup by no later than July 8th unless you arrange for shipping in advance of buying this.

    Picture limitations are severe on this forum so look at this for pictures - https://sfbay.craigslist.org/pen/sop...336069902.html
    Last edited by cclaunch; June 16, 2021, 11:27 AM. Reason: drives sold elsewhere
Working...
X