Casio WK-1800, Service Manual

Page: 12 / 44

— 11 —
FDD UNIT (DF354H064C)
FDD Specifications:
1
Memory Capacity (under un-format) : 1.6 MByte
2
Density of track : 5.33 track/mm (135 TPI)
3
Number of track : 77 track/side
4
Number of head : 2
5
Rate of data transfer : 500 kbps
6
Access time (between two tracks) : 3 m seconds
7
Compensation of writing data : 125 n second (all tracks)
8
Rotation speed : 360 Min
-1
(rpm)
±
1.5 %
FDD Interface:
Host system Drive
CN2 connector
Index 8
Density Select 4
Drive Select 1 12
Motor ON 16
Direction 18
Step 20
Write Data 22
Write Gate 24
Track 00 26
Write Protect 28
Read Data 30
Side 1 Select 32
Disk Change 34
+5 V
DC.GND
System Frame GND.
Drive Frame GND.
0
Ω
1
+5 V Return 2
+5 V Return 3
N.C 4
CN1 connector
Signal GND
GND Pin Numbers of CN2:
1, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33
Non connected Pin Numbers of CN2:
2, 6, 10, 14 (Pin #3 is removed to prevent erroneous insertion)