TABLE 21 - DESCRIPTION OF COMMAND SYMBOLS
POLL
Polling Disable
When set, the internal polling routine is disabled. When clear, polling
is enabled.
PRETRK
Precompensation Programmable from track 00 to FFH.
Start Track
Number
R
Sector Address
The sector number to be read or written. In multi-sector transfers,
this parameter specifies the sector number of the first sector to be
read or written.
RCN
SC
Relative Cylinder
Number
Relative cylinder offset from present cylinder as used by the Relative
Seek command.
Number of Sectors The number of sectors per track to be initialized by the Format
Per Track
Skip Flag
command. The number of sectors per track to be verified during a
Verify command when EC is set.
SK
When set to 1, sectors containing a deleted data address mark will
automatically be skipped during the execution of Read Data. If Read
Deleted is executed, only sectors with a deleted address mark will be
accessed. When set to "0", the sector is read or written the same as
the read and write commands.
SRT
Step Rate Interval The time interval between step pulses issued by the FDC.
Programmable from 0.5 to 8 milliseconds in increments of 0.5 ms at
the 1 Mbit data rate. Refer to the SPECIFY command for actual
delays.
ST0
ST1
ST2
ST3
Status 0
Status 1
Status 2
Status 3
Registers within the FDC which store status information after a
command has been executed. This status information is available to
the host during the result phase after command execution.
WGATE
Write Gate
Alters timing of WE to allow for pre-erase loads in perpendicular
drives.
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