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

Removing ICs

  • Filter
  • Time
  • Show
Clear All
new posts

    Removing ICs

    This article covers the removal of [wiki="IC Socket"]socketed[/wiki] [wiki="Integrated Circuit"]IC[/wiki]s. For the removal of soldered-in parts, see [wiki]desoldering ICs[/wiki].
    It is often necessary to remove ICs for reseating, replacement or simply to salvage parts for later use. Many modern systems use ZIF (zero insertion force) sockets which makes IC removal incredibly simple. Most vintage equipment, however, uses standard DIP (dual in-line package) sockets, although you may also come across the occasional PLCC package.
    DIP Sockets

    [wiki="File:Removing_DIP.jpg"]200px|thumb|right|Removing a DIP integrated circuit using a screwdriver.[/wiki]
    The preferred way to remove a DIP part is to use an extractor tool designed for the job. Some look like a large pair of tweezers with the ends bent inwards to grasp the chip. Others use a clamp and trigger mechanism to pull the part out of its socket.
    One of the blanking plates from the back of a PC makes a handy extraction tool. Simply slide the top of it (where the screw goes) under one end of the chip and gently rock it back and forth. Alternate to each end till the chip is completely freed from the socket.
    If you don?t have access to the above equipment, it?s quite possible to remove an IC using just basic tools. A long, thin-bladed screwdriver is good and, failing that, a sturdy knife is a reasonable substitute. Simply work the blade into the gap between the chip and its socket and gentle pry one end out a couple of millimeters. Take care that your chosen implement doesn?t poke through the gap and damage any delicate traces on the circuit board itself. Repeat at the other end; it?s a good idea to put another implement in the gap you just made to prevent the chip from working its way back in whilst you pry out the other end. Don?t just push a big screwdriver and try to pop the chip out in one go ? this is a sure-fire way to bend the pins. Keep working at alternating ends, a little at a time, and the chip will eventually pop out, hopefully in one piece. If you do manage to bend any pins ?sideways? (i.e. such that the pins are no longer evenly spaced) they can be gently pushed back into position using a small pair of pliers. Often the pins end up correctly spaced, but not aligned with each other. This is simply remedied by gently pushing all the pins on the same side of the chip against a hard surface like a workbench.
    PLCC Sockets

    [wiki="File:PLCC_Chips.jpg"]200px|thumb|right|PLCC integrated circuits in their sockets. Note the recessed corners to facilitate extraction.[/wiki]
    As with DIP sockets, the ideal method of extraction is to use the purposed-designed tool. This resembles a pair of tweezers enclosed in a scissor-like assembly which grips the chip, allowing it to be extracted easily.
    Lacking the proper tool, it?s possible to lever out a PLCC chip by inserting two narrow objects (such as a pair of jeweler?s screwdrivers) into the recessed corners of the socket. Apply even pressure on both sides and work the part gently from its socket.
    ZIF Sockets

    If you?ve looked inside a modern PC, you?ll most probably be familiar with this type of socket. Assuming any heat shield which attaches to the socket has been removed, it?s simply a question of lifting the lever, replacing the now completely freed chip, and pushing the lever back down.
    See Also

    • [wiki]Inserting ICs[/wiki]
    • [wiki]Reseating ICs[/wiki]