Optional 5 1/4-Inch Slot Devices; 1/4-Inch Diskette Drive; 1/4-Inch Diskette Drive Settings; Osda-90C, 1.44-Mb Diskette Drive - NEC POWERMATE P60D Service Manual

OPTIONAL 5 1/4-INCH SLOT DEVICES

This subsection provides the procedures for installing an optional 5 1/4-inch device into the
system unit. The optional NEC diskette and hard disk drives are described first, then proce-
dures for installing the devices follow.

5 1/4-Inch Diskette Drive

Two diskette drives are supported in all system. A 3 1/2-inch diskette drive comes standard
with the PowerMate systems. The drives are connected by a single ribbon cable with two
drive connectors. The first diskette drive (3 1/2-inch) is drive A, the second diskette drive is
drive B. The diskette cable plugs directly into the system board.
The diskette drive controller is incorporated into the system board. The controller contains
the circuitry and control functions needed to support up to two diskette drives. See the
5 1/4-inch device installation instructions later in this section.

5 1/4-Inch Diskette Drive Settings

Specifications for the 5 1/4-inch, 1.2-MB diskette drive is listed in Appendix B, Specifica-
tions. The standard 1.44-MB diskette drive setting is in shown in Figure Section 3-16. The
settings for the optional 1.2-MB diskette drive are shown in Figure Section 3-18.
When installing two diskette drives, both diskette drives are addressed to drive 1. The ter-
minating resistor jumper should not be removed from the 5 1/4-inch diskette. Both diskette
drives (the standard and the optional) are normally terminated.
Signal Connector
DS SW1
Power Connector
Figure Section 3-16 OSDA-90C, 1.44-MB Diskette Drive
Options 3-21
Front
of Drive