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6
Interface Installation and Configuration
Connecting the Interface to Disc Drives
The HP 98625 Disc Interface is intended ONLY for connecting the HP 9826/HP 9836 Compu-
ter to HP 7900 Series disc drives equipped with CS/80 (Command Set 1980) controllers. Do
not attempt to use the interface with any other disc or controller. If you have any question
concerning compatibility of the interface and a specific drive, contact your nearest HP Sales and
Service office. This chapter explains which interface cables can be used, and establishes guide-
lines for connecting multiple drives to a single interface.
Interface Cables
Use only HP 10833 HP-IB chaining cables to connect the disc interface to disc drives. These
cables are also used to chain multiple drives together. HP 10833 Series cables are similar in
appearance to standard HP-IB or IEEE-488 chaining cables, but they have additional shielding
and other features to minimize RFI and improve noise characteristics. HP 10833 cables can be
identified by the model number printed on the cable jacket at each end of the cable. Do not use
any other model cable to connect the interface to disc drives or controllers.
Chaining cables are usually supplied with disc drives, so none is included with the interface.
Cables are available in several lengths. If you need additional or different length cables, you can
order any of the following:
Available HP-IB Interface Cables
Catalog Number
10833A
108338
10833C
108330
Cable Length
1 metre
2 metres
4 metres
0.5 metre
Note that the total cable length in any application must not exceed 10 metres.
Physical Arrangement of Equipment
HP-IB connections can usually be made using either linear ("daisy-chain") or star configura-
tions. However, the linear configuration is preferred because it allows shorter cable lengths and
maximizes noise and performance safety margins.
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