Read Data (Rot); Write Protect (Prt); Disk Change (Dcg); Read Data Signal Timing - NEC FD1165 Maintenance Manual

3.4.6 Read Data (ROT)
A signal on this line conditions the data that is sent from
the disk drive to the host system. The line transmits the
Read Data or the Standardized Read Data signal depending
upon the pos i tion of the RO jumper (see Section 2.8.8).
Figure 3-7 shows typical ROT-conditioned signals.
ROT
(FM)
RDT
(MFM)
~+- ~
+-
-1 W~
w
=
200 ±
50 ns
T
=
2
/.lS
T 1.5T
-411---
1.5T 2T
Figure 3-7 Read Data Signal Timing
3.4.7 Write Protect (PRT)
The Write Protect signal goes High when the flexible disk
does not have a write protect notch. If the flexible disk
has a wr i te protect notch, the Wr i te Protect signal goes
Low. A Low Write Protect signal puts the flexible disk in
a write-protected state.
3.4.8 Disk Change (DCG)
When the flexible disk has been changed since the disk drive
was last selected, this signal goes Low. Figure 3-8 shows
the Disk Change signal timing.
3-8