[GreenKeys] TTY gear - Loves Park IL

[Jim Haynes]

"monkey on a string" refers to the "crawling head" tape reader as part
of the FRXD.  Officially called a "pivoted head" reader.  The read head
can pull itself up the tape so as to read the very last character punched.
Similar reader exists in the Model 28 line, believe it's the LAXD.
The idea is so that you don't have to punch a bunch of feedout characters
after the end of the message to allow the end of the message to pass
completely through the reader, as is the case with more ordinary readers
such as used in Model 19.  However a lot of Model 28 reperforators have
an option called MNILFO   measured non-interfering letters feed out
meaning that after the end of a message the reperf will punch a bunch of
LTRS characters sufficient to get the end of the message through a
nearby reader.  non-interfering means if new traffic starts coming in
the reader will quit punching the feedout characters and punch the message
characters.