Fujitsu M2301B Manual page 58

(g) PLO CLOCK (Balanced Transmission)
This pulse is sent out every other bit. When READ GATE is false, the PLO
CLOCK is synchronized with the read pulse from the clock track. When
READ GATE is true, the PLO is synchronized with the READ DATA
from the data head. The controller uses the PLO CLOCK during a write
operation as WR ITE CLOCK. PLO CLOCK is available to both the A and
B cables when enabled by a switch on the PCB. This pulse is jumper select-
able to provide a normal or inverted triggering.
(h) SEEK COMPLETE
B03P-4605-0003A .... B
The SEEK COMPLETE signal indicates that the selected data head in the
drive is positioned over the required track. This signal may contain the
settling time for the seek operation a READIWRITE operation is legal in
the instant this signal turns TURE. This signal is available to both the A
and B cables, however, in case of CNA it is enabled by a switch key on the
PCB.
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