IBM 4865 (External 3.5" floppy)
Michael B. Brutman
mbbrutman-cctalk at brutman.com
Tue Sep 18 21:26:49 CDT 2007
Does anybody remember how these connect to a PC or XT?
Obviously there is the DB37 which has the signals. On one version of
the drive (the 720KB version) there is just the signal cable, and no
power pigtail or external power - power must come through the DB37
cable, but the technical reference for the floppy controller doesn't
have any pins that provide power. Was there a special card that passed
the signal wires through and added +5 and +12 to the DB37 going to the
drive? (Maybe on pins 1 - 4, which are supposed to be unused?)
On the other version I have there is the power pigtail, which is
obviously where the power comes from. The pins on the power pigtail are
connected to pins 1 - 4 on the DB37.
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