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In the star configuration, each disk drive requires a termination network; in the daisy-chain config-
uration, only the last disk drive in the daisy chain requires a termination network. Either system
configuration can interface with up to four Model FDD100-5 Disk Drives.
2.3.2
ELECTRICAL CONNECTORS
The interface between the Model FDD100-5 Disk Drive and the controller consists of two connec-
tors: J1 and J2. J1 provides the signal interface and J2 provides DC power. There is also a frame
ground "Fast-On" terminal.
2.3.2.1
Signal Interface Connector. The signal interface (J 1) is a 34-pin PWB edge connector
with dimensions as shown in Figure 2-4. Even-numbered pins are located on the component side of
the PWB, and odd-numbered pins are located on the solder side. Pin 2 is located closest to the
corner of the PWB. A slot is provided between pins 4 and 6 for connector keying. The recom-
mended connectors for P1 are listed in Table 2-1.
Table 2-1. Recommended Connectors - P1
Type of Cable
Manufacturer
Connector PIN
Contact PIN
Twisted Pair, 26
AMP
583717-5
1-583616-1
Flat Cable
3M "Scotchflex"
3463-0001
N.A.
1 . .
'.785 +.005 IN.
..
14.5339 + .0127 CM)
34
1
o IN•
t
•350+ .01
1.889-+ .254CM)
-
.
.093 IN.
~
1....-1.236CM)
NOM.
BOARDTHICKNESS
•
.062 + .007 IN•
1.15748 + .017 78CM)
.100 IN•
1.-.1.254 CM)
NOM.
KEY SLOT---./ / . . -
'1c:g:,ti~01'~'6
CM)
II
.400 + .005 IN.
11.of6 + .0127 CM)
.400.:!: .005 IN.
~
t
I'
050 IN
11.016.:!: .0127 CM)
- - . .
~i.127 CM)
NOM.
.050 IN.
1.127CM)
~
NOM.
1
1
2
.450+ .005 IN.
11.143
:!:
.0127 CM)
~
Figure 2-4. J 1 Connector Dimensions
2-5
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