ROBO-503/ROBO-503N
ROBO-503/ROBO-503N User’s Manual
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3.7.7 Signal Description – Floppy Connector (CN2)
RDATA#
The read data input signal from the FDD.
WD#
Write data. This logic low open drain writes pre-compensation serial data to the selected FDD.
An open drain output.
WE#
Write enable. An open drain output.
MOA#
Motor A On. When set to 0, this pin enables disk drive 0. This is an open drain output.
MOB#
Motor B On. When set to 0, this pin enables disk drive 1. This is an open drain output.
DSA#
Drive Select A. When set to 0, this pin enables disk drive A. This is an open drain output.
DSB#
Drive Select B. When set to 0, this pin enables disk drive B. This is an open drain output.
SIDE1#
This output signal selects side of the disk in the selected drive.
DIR#
Direction of the head step motor. An open drain output
Logic 1 = outward motion
Logic 0 = inward motion
STEP#
Step output pulses. This active low open drain output produces a pulse to move the head to
another track.
DRVDEN0/1# This output indicates whether a low drive density (250/300kbps at low level) or a high drive
density (500/1000kbps at high level) has been selected.
TRAK0#
Track 0. This Schmitt-triggered input from the disk drive is active low when the head is
positioned over the outermost track.
INDEX#
This Schmitt-triggered input from the disk drive is active low when the head is positioned over
the beginning of a track marked by an index hole.
WP#
Write protected. This active low Schmitt input from the disk drive indicates that the diskette is
write-protected.
DSKCHG#
Diskette change. This signal is active low at power on and whenever the diskette is removed.
