HP gx466 Manuale Utente

56 ECM-5510 User’s Manual 
 

 

RDATA 

The read data input signal from the FDD. 

WDATA 

Write data. This logic low open drain writes pre-compensation serial data to the 

selected FDD. An open drain output. 

WGATE 

Write enable. An open drain output. 

MOATSA 

Motor A On. When set to 0, this pin enables disk drive 0. This is an open drain 

output. 

MOTEB 

Motor B On. When set to 0, this pin enables disk drive 1. This is an open drain 

output. 

DRVSA 

Drive Select A. When set to 0, this pin enables disk drive A. This is an open drain 

output. 

DRVSB 

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. 

REDWC 

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. 

TK00 

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. 

WPT 

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.