TABLE 18 - STATUS REGISTER 2
NAME DESCRIPTION
Unused. This bit is always "0".
Control Mark Any one of the following:
1. Read Data command - the FDC encountered a
BIT NO.
SYMBOL
CM
7
6
deleted data address mark.
2. Read Deleted Data command
encountered a data address mark.
-
the FDC
5
4
DD
Data Error in
Data Field
Wrong
The FDC detected a CRC error in the data field.
WC
The track address from the sector ID field is different
from the track address maintained inside the FDC.
Unused. This bit is always "0".
Cylinder
3
2
1
Unused. This bit is always "0".
BC
Bad Cylinder
The track address from the sector ID field is different
from the track address maintained inside the FDC and is
equal to FF hex, which indicates a bad track with a hard
error according to the IBM soft-sectored format.
0
MD
Missing Data The FDC cannot detect a data address mark or a deleted
Address Mark data address mark.
TABLE 19 - STATUS REGISTER 3
BIT NO.
SYMBOL
NAME
DESCRIPTION
Unused. This bit is always "0".
Indicates the status of the WP pin.
7
6
WP
T0
Write
Protected
Track 0
5
4
3
Unused. This bit is always "1".
Indicates the status of the TRK0 pin.
Unused. This bit is always "1".
2
1,0
HD
DS1,0
Head Address Indicates the status of the HDSEL pin.
Drive Select Indicates the status of the DS1, DS0 pins.
33
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