(J) Direction; Write Data - Epson SMD-100 series Specification

(2)
Motor
ON (MON)
The spindle drive is operated when this signal is low. However, read and
write operations are only performed when the read (ROY) signal is low.
(If the dlsk cartridqe is not set in the drive, the spindle drive will
not operate.) The
RDY
signal goe5 low within one second after the
MON
signal 15 input when a disk cartridge has been set.
(3)
Direction
(DRTN)
This signal determines the direction of the movement of the step motor
which controls the movement of the read/write heads. When this signal i9
low, the read/write head will move toward the . center of the disk and when
it 1s high, toward the edge of the dlsk.
(4) Step (STP)
The low pulse of this s~gnal causes the
·s
t
e p
motor to move in the
direction indicated by the DRTN signal. The response step cycle
(Ts
min.)
15 3ms/track for models
140/130
and 6ms/track for models 120/110. When
the write
gate
signal 1s low, step 1s internally inhibited.
Wben the s'eek direction i5 reversed, the reverse step pulse must be sent
after the last pulse (Ts min + 6ettlinq :tlwe).
A: Jms(mil)
B
" "6ms(mn)
I
m.dmn\
1 3 0 )
A.
B
(SMD-120,
1 1 0 )
(5)
Wri te ga te
fWTG)
This signal selects between read and write data. When th1s signal 1s low,
write data
1s
enabled and when high, read data 1s enabled.
Write operations to a cartridge to which a write enable cover has not
be~o
affixed are internally inhibited by the disk drive.
After the WTO signal goes high, there is a 1.3ms eraae timing. Fo'r this
reason the
see~
or read operation will not begin immediately.
(6) Write data (WTO)
This signal transanits the write data that is beiog written to the disk.
The fall of th1s signal from high to low causes the
~rite
current flowing
through the read/write head to reverse polarity. '!his signa" l is operable
only when the write gate signal is low.
9