HP PageWriter XL M1705B Service Manual page 216

Table A-10. Disk Drive Logic Connector 515
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8 INDEX 25 GROUND
9 GROUND 26 TRKOO
10 DRVOSEL 27 GROUND
11 GROUND
28 WRITEPROTECT
12 DRVlSEi 29 GROUND
13 GROUND
30 READDATA
Signal Definition
DIRECTION
Determines the direction of the read/write head
inoveinent.
DISKCHANGE Indicates to the system that the disk has been
DRVOSEL,
DRVlSEL,
DRV2SEL,
DRVSSEL
INDEX
MOTOR ON
READDATA
SIDElSEL
STEP
TRKOO
WRITEDATA
A-10 Connector Pin Assignments
removed from the drive. Goes low when the disk is
rclnoved; goes high when a disk is reloaded and a
step pulse is received from the system.
Drive select signals.
A once-per-revolution pulse that indicates the
beginning of a track on the disk.
Controls the operation of the drive motor when a
disk is loaded.
Data read from the disk and sent to the system.
Selects the side of the disk to be used.
A pulse signal that nloves the heads in the direction
specified by DIRECTION.
Indicates to the system that the heads are positioned
at the outermost track (track 00).
Data from the system that is written on the disk.