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DIR Direction — This line sets the direction for the disk head. A high on this line sets the direction
away from the spindle. A low on this line sets the direction toward the spindle.
DISKINn Disk In — This line goes low when a flexible disk is inserted in the A100 Disk Drive assembly.
DRIVESELn Drive Select — A low on this line selects the A100 Disk Drive assembly.
DSKCHGn Disk Change — This line goes low when a flexible disk is removed from the A100 Disk Drive
assembly. This line remains low until a flexible disk is installed and STEPn goes low.
HDSEL Head Select — A low on this line selects the lower disk drive head. A high on this line selects
the upper disk drive head.
HIDENSn High Density Select — This line goes low when a high density flexible disk is inserted in the
A100 Disk Drive assembly.
INDEXn Index — This line pulses low with each revolution of the flexible disk.
MTRn Motor On — A low on this line turns on the disk drive motor.
ReDATAn Read Data — This line pulses low for each bit detected on the flexible disk.
SEL0 - SEL1 Drive Select — When SEL0 and SEL1 are low, the A100 Disk Drive assembly is enabled.
STEPn Step — A low on this line moves the disk drive head. When STEPn and DIR are low, the head
moves toward the disk spindle. When STEPn is low and DIR is high, the head moves away
from the disk spindle.
T00n Track 00 — This line is low when the head is positioned over track 0 on the flexible disk.
WDATA Write Data — When WGATE is low, a low pulse on this line writes a bit to
the disk.
WGATE Write Gate — When this line is low, information may be written to the A100 Disk Drive
assembly under control of the WDATA line.
WRIPROTn Write Protect — This line is low when a write-protected disk is installed in the A100 Disk
Drive assembly.
Agilent 35670A Voltages and Signals
A100 Disk Drive
9-35