On Wed, 25 Oct 2023, Mark Perullo wrote:
halves".  One half looks like an "upper and lower" for the two tracks, then
next to that is a "vertical bar."   I've never quite understood what that
vertical bar is - I assume a WRITE portion of some sort??     The ones in
the ebay listing don't have this "vertical bar."

That is the erase head.

Then the pins on the back of the head:  the one I have for my 5100/5110 is
"6 small pins" next to "4 fat pins" (the 4 fat pins are in line with the
"vertical bar" mentioned above).   Of all the heads I came across, I could
find the "6 small pin" configuration, but never the "4 fat pins."

My guess (System Logics Manual page 435 seems to support this)
6 small pins: the two center-taped read-write-heads
4 fat pins: the two erase heads

Christian

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