Terminator Resistors; Data And Control Interface Contact Assignments - NEC FD1165 Maintenance Manual

Table 2-3 Data and Control Interface Contact
Assignments
SIGNAL NAME
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
CONTACT
NUMBER
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
SIGNAL NAME
LOW CURRENT
UNSAFE RESET
FILE UNSAFE*
(UNUSED)
TWO-SIDED
DISK CHANGE
SIDE SELECT*
IN USE
HEAD LOAD
INDEX
READY *
VFO SYNC**
DRIVE SELECT 1*
DRIVE SELECT 2*
DRIVE SELECT 3*
DRIVE SELECT 4*
DIRECTION SELECT
STEP
WRITE DATA
WRITE GATE
TRACK 00
WRITE PROTECT
READ DATA
MFM**
WINDOW**
CONTACT
NUMBER
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
*Enabled by jumpers
**Signals used only when VFO option is installed.
2.6 TERMINATOR RESISTORS
The Model FDl165 is shipped with terminator resistor arrays
RNI and RN2 installed as shown in Figure 2-11. Do not re-
move these resistors when only a single disk drive is used
in a system. Do not remove these resistors when two or more
disk
drive~
are connected in parallel to a single controller
(see Figure 2-12A). However, when two or more disk drives
are connected in ser ies to a single con troller, remove RNI
and RN2 from each disk dr ive except the last one in the
circuit (see Figure 2-12B).
2-9