RECALIBRATE
DATA BUS
PHASE
R/W D7 D6 D5 D4 D3 D2
D1
D0
REMARKS
Command
W
W
0
0
0
0
0
0
0
0
0
0
1
0
1
1
Command Codes
DS1 DS0
Execution
Head retracted to Track 0
Interrupt.
SENSE INTERRUPT STATUS
DATA BUS
PHASE
Command
Result
R/W D7 D6 D5 D4 D3 D2 D1 D0
REMARKS
Command Codes
Status information at the end
of each seek operation.
W
R
0
0
0
0
1
0
0
0
─────── ST0 ───────
R
─────── PCN ───────
SPECIFY
DATA BUS
PHASE
R/W D7 D6 D5 D4 D3 D2 D1 D0
REMARKS
Command
W
W
W
0
0
0
0
0
0
1
1
Command Codes
─── SRT ───
─── HUT ───
────── HLT ──────
ND
SENSE DRIVE STATUS
DATA BUS
R/W D7 D6 D5 D4 D3
PHASE
D2
D1
D0
REMARKS
Command
W
W
R
0
0
0
0
0
0
0
0
0
0
1
0
0
Command Codes
HDS DS1 DS0
Result
─────── ST3 ───────
Status information about
FDD
SEEK
DATA BUS
PHASE
R/W D7 D6 D5 D4 D3
D2
D1
D0
REMARKS
Command
W
W
W
0
0
0
0
0
0
0
0
1
0
1
1
1
Command Codes
HDS DS1 DS0
─────── NCN ───────
Execution
Head positioned over
proper cylinder on
diskette.
CONFIGURE
DATA BUS
PHASE
Command
R/W D7 D6
D5
0
D4
1
D3
0
D2
0
D1
1
D0
1
REMARKS
Configure
Information
W
0
0
W
W
W
0
0
0
0
0
0
0
0
0
EIS EFIFO POLL
───────── PRETRK ─────────
─── FIFOTHR ───
Execution
Page 42
SMSC [ SMSC CORPORATION ]
