Wgt Timing; Write Gate (Wgt) - NEC FD1165 Maintenance Manual

3.3.6

Write Gate (WGT)

This signal selects the read or write operation.
signal is Low, data is written to the disk.
is High, data
operation, data
flexible disk for 560 ys after WGT goes High.
560 ys, the Head Load signal cannot be disabled, the Side
Select signal cannot
cannot be enabled.
the WGT and Erase signals are both High.
WGT timing chart.
3.3.7 Write Data (WDT)
The signals on this line contain the data that is written
on the flexible disk.
(FM) or in Modified Frequency Modulated
Figure 3-5).
3.3.8 Low Write Current (LWC)
This signal controls the write current amplitude to compen­
sate for the difference in density between
outer tracks of the flexible disk.
for external tracks (00 to 42) and Low for internal tracks
(43 to 76) .
is read from the disk.
is erased between adjacent
be changed,
These signals can be changed only when
Figure 3-4
The data is in Frequency Modulated
3-5
If the signal
During
tracks on the
and the Step operation
Figure 3-4 is the

WGT Timing

(MFM)
the inner and
The LWC signal is High
If the
the Write
During this
format (see