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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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Safe way to insert v-20 in 5150 without bending the legs?

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    #16
    Originally posted by SpidersWeb View Post
    I put the IC on it's side on a flat surface, and push down while rolling inwards a little. Then repeat for other side.
    Test fit, if still to wide, roll more.

    Only takes a few seconds and always works flawlessly for me.
    I agree, it can be done in steps so that the ultimate spacing of the pins on each side of the IC matches the spacing of the socket entry points.

    The pushing down part you mentioned is very important because when the pins bend, you want them to bend near the IC body, so the entire pin remains straight. If the pins are bent elsewhere I also use the smooth long nosed pliers.

    Many NOS IC's the pins are far too far apart and are way off the standard DIL format of the socket, and if they are inserted into a socket, by aligning one row and springing them together to engage the other row (call that the compression method for want of a name) it can cause problems, especially with the old TI style sockets, where the pin then misses the two jaws of the socket's claw and slips down beside the IC's plastic body and claw metalwork, making for an unreliable connection that causes a failure later. Though this is not as much of a problem with the standard dual wipe or machined pin sockets.

    Yet reading some of the old PT assembly manuals the compression method was recommended. In my SOL-20 and on some of PT's 16kRA memory cards I found exactly this problem where this method was used by the original board's constructor and I had to do what you have said, to align the IC pins to fit the entry points on the sockets, prior to inserting each IC.

    Another thing that can help, if there is doubt that the original socket might have been damaged, a pin fron a defunct IC can be soldered to a small wire handle to feel the individual socket claw tensions and how that is for the standard geometry IC pin.
    Last edited by Hugo Holden; June 23, 2020, 03:50 PM.

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      #17
      I used the rolling method to insert the other V-20. 5150 working.

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