W83877TF/W83877TG
-20 -
(3) Read A Track
PHASE R/W D7 D6 D5 D4 D3 D2 D1 D0 REMARKS
Command W
0 MFM 0 0 0 0 1 0
Command codes
W
0 0 0 0 0 HDS DS1 DS0
W
W
---------------------- C ------------------------
---------------------- H ------------------------
Sector ID information prior
to command execution
W
W
---------------------- R ------------------------
---------------------- N ------------------------
W
W
-------------------- EOT -----------------------
-------------------- GPL -----------------------
W -------------------- DTL -----------------------
Execution
Data transfer between the
FDD and system; FDD
reads contents of all
cylinders from index hole to
EOT
Result R
R
R
-------------------- ST0 -----------------------
-------------------- ST1 -----------------------
-------------------- ST2 -----------------------
Status information after
command execution
R
R
R
R
---------------------- C ------------------------
---------------------- H ------------------------
---------------------- R ------------------------
---------------------- N ------------------------
Sector ID information after
command execution
(4) Read ID
PHASE R/W D7 D6 D5 D4 D3 D2 D1 D0 REMARKS
Command W
0 MFM 0 0 1 0 1 0
Command codes
W
0 0 0 0 0 HDS DS1 DS0
Execution
The first correct ID
information on the cylinder
is stored in Data Register
Result R
R
R
-------------------- ST0 -----------------------
-------------------- ST1 -----------------------
-------------------- ST2 -----------------------
Status information after
command execution
R
R
R
R
---------------------- C ------------------------
---------------------- H ------------------------
---------------------- R ------------------------
---------------------- N ------------------------
Disk status after the
command has been
completed