Tandy 1400LT - Index Signal Timing; Track 00 Signal Timing; Read Data Timing

Index
This line is used for indicating the reference position of a track.
The leading edge of an Index pulse should be used when an Index signal is needed.
L
READ DATA
-
6ps *
Figure C-8 shows the Index signal timing.
- d
8JlS *
)r= -
INDEX
The wow-flutter is r 1.5% max.
Figure C-8. Index Signal Timing
Track
00
This signal becomes “Low” when the R/W Heads is positioned at track 00.
Fig. C-9 shows the timing for the last STEP pulse and the TRACK 00 signal.
STEP
TRACK 00
1
Figure C-9. Track 00 Signal Timing
Write Protect
A “low” level on this line indicates that the disk inserted in the drive is write-protected, or the Vcc is below the
level for write protect.
Read Data
This line provides “raw data” (clock and data information unseparated). See the Figure C-10.
Note: 1 ) Ftqures with indicate the nominal positions
2) The accuracy of READ DATA to reference position is within + 0 711s
Figure C-10. Read Data Timing
c-11