IBM 727 Manual Of Instruction page 104

SELECT LINES
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SELECT 8 AT LOAD POINT
SELECT a REWIND
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START REWIND
^ SEL. a TAPE IND. OFF
TURN OFF TAPE
SEL. a TAPE IND. ON
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TURN ON TAPE
S E T WRITE STATUS
SEL., READY a
s SET READ STATUS
SELECT, READY a READ
WRITE BUS (7)
---------------------------------------------------- ^
^ WRITE ECHO BUS
READ BUS (7)
WRITE PULSE
~ — —-----— --- - - ------------------------------------
WRITE CHECK CHAR.
GO
BACKWARD
\
FIG U RE 15. C O N TR O L L IN E S
^
(10)
STATUS
TAPE DRIVE UNIT
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IND.
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s
IND.
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WRITE
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^
^
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TYPE 727