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5.6.6. Connector FDD1200 ( Floppy )
All signals are TTL compatible.
DR0#
Drive select 0.
INDEX#
Active low Schmitt Trigger input signal senses from the disk drive that the head is positioned over the
beginning of a track, as marked by an index hole.
TRK0#
Active low Schmitt Trigger input signal senses from the disk drive that the head is positioned over the
outermost track.
WRTPRT#
Active-low Schmitt Trigger input signal senses from the disk drive that a disk is write-protected.
RDATA#
Active-low, raw data read signal from the disk is connected here. Each falling edge represents a flux
transition of the encoded data.
DSKCHG#
Disk interface input indicates when the disk drive door has been opened. This active-low signal is read
from bit D7 of location base+7.
MTR0#
Active-low output selects motor drives 0.
HDSEL#
Active low output determines which disk drive head is active. Low = Head 0, high (open) = Head 1.
FDIR#
Active low output determines the direction of the head movement (low = step-in, high = step-out).
STEP#
Active low output signal produces a pulse at a software-programmable rate to move the head during a
seek operation.
WDATA#
Active low output is a write- precompensated serial data to be written onto the selected disk drive.
Each falling edge causes a flux change on the media.
WGATE#
Active-low, high-drive output enables the write circuitry of the selected disk drive.
Page 21 of 62 Pages
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