7
INT
6
5
4
3
2
1
0
DIR
nDRV2 STEP nTRK0 HDSEL nINDX nWP
PENDING
RESET
COND.
0
1
0
N/A N/A N/A
0
0
BIT 0 DIRECTION
Active high status indicating the direction of head movement. A logic "1" indicates inward direction; a logic "0" indicates
outward direction.
BIT 1 nWRITE PROTECT
Active low status of the WRITE PROTECT disk interface input. A logic "0" indicates that the disk is write protected.
BIT 2 nINDEX
Active low status of the INDEX disk interface input.
BIT 3 HEAD SELECT
Active high status of the HDSEL disk interface input. A logic "1" selects side 1 and a logic "0" selects side 0.
BIT 4 nTRACK 0
Active low status of the TRK0 disk interface input.
BIT 5 STEP
Active high status of the STEP output disk interface output pin.
BIT 6 nDRV2
This function is not supported. This bit is always read as “1”.
BIT 7 INTERRUPT PENDING
Active high bit indicating the state of the Floppy Disk Interrupt output.
PS/2 Model 30 Mode
7
INT
PENDING
6
5
4
3
2
1
WP
0
DRQ STEP TRK0 nHDSEL INDX
F/F
nDIR
RESET
COND.
0
0
0
N/A
1
N/A
N/A
1
BIT 0 nDIRECTION
Active low status indicating the direction of head movement. A logic "0" indicates inward direction; a logic "1" indicates
outward direction.
BIT 1 WRITE PROTECT
Active high status of the WRITE PROTECT disk interface input. A logic "1" indicates that the disk is write protected.
BIT 2 INDEX
Active high status of the INDEX disk interface input.
BIT 3 nHEAD SELECT
Active low status of the HDSEL disk interface input. A logic "0" selects side 1 and a logic "1" selects side 0.
BIT 4 TRACK 0
Active high status of the TRK0 disk interface input.
BIT 5 STEP
Active high status of the latched STEP disk interface output pin. This bit is latched with the STEP output going active,
and is cleared with a read from the DIR register, or with a hardware or software reset.
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