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Re: IIe socket shims
They keep the auto insertion machines honest ... and the chip leads
straight.
The IC leads are just this side of the longest they can be for that
socket, leaving a slight gap underneath. But the early day insertion
machines would push just a bit more - expecting resistance and the IC
leads would bow and possibly, similar to what happens with the CPU
socket when shoving in a ZipGS / TWGS connector, the internal
structure of the socket is altered ever so slightly, but just enough
to make it not work properly.
If it's not making good contact, it's all over.
The best way to put an IC in a socket is push it until it stops, but
with a finger. Not mush it down in, like people tend to do when
pushing the DIP ribbon header in.