Interface Connections - Tandy 1400LT Service Manual

2. Electrical Interface
INTERFACE CONNECTION
The FDD interface connection is shown in Fig. C-3.
DRIVE SELECT 1
+ 5 v
+ 5 v
1 -
> 6
I NDEX ( I D X )
+
5 v
3
+ 5 v
WRITE GATE
( W G )
GND
3-
TRACK 00 ( T O O )
~~
4
-
GND
WRITE PROTECT ( W P )
GND
4
-
DRIVE SELECT0 ( D S O ) Spindle Motor Circuit
1 4 4
-
-
1 0
4 1
2 0
41
2 2
SIDE 1 SELECT
( H S )
>
DI RECTI ON ( D R )
GND
z
1 2
100KQ
FRAME GND
2 6
0.01 yF
WRITE DATA
GND
5
+ 5 v
Analog Circuit
+ 5 v
READ DATA ( R D )
GND
2 4
4
\
-
l 5
GND
17
19
2 1
2 3
Figure C-3. Interface Connections
C-6