INSTALLATIONS
16
IB770 User’s Manual
J3: Digital I/O Connector (4 in, 4 out)
This 12-pin Digital I/O connector supports TTL levels and is used to
control external devices requiring ON/OFF circuitry.
Signal Name
Pin #
Pin #
Signal Name
IN0
1
7
+5V
IN1
2
8
OUT0
IN2
3
9
Ground
IN3
4
10
OUT1
GROUND
5
11
+12V
OUT2
6
12
OUT3
J4: Floppy Drive Connector
J4 of the IB770 is a 34-pin header and will support up to 2.88MB FDD.
Signal Name
Pin #
Pin #
Signal Name
Ground
1
2
RM/LC
Ground
3
4
No connect
Ground
5
6
No connect
Ground
7
8
Index
Ground
9
10
Motor enable 0
Ground
11
12
Drive select 1
Ground
13
14
Drive select 0
Ground
15
16
Motor enable 1
Ground
17
18
Direction
Ground
19
20
Step
Ground
21
22
Write data
Ground
23
24
Write gate
Ground
25
26
Track 00
Ground
27
28
Write protect
Ground
29
30
Read data
Ground
31
32
Side 1 select
Ground
33
34
Diskette change